Service bulletins for the 2025 Mercedes-Benz AMG GT
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
139 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| LI54.10-P-080053 | 2025-12-04. Service bulletin. ELECTRICAL SYSTEM. Complaint Discharge of 12 V battery in the event of a longer non-operational time - model series 232 and model series 192 Cause Increased quiescent current Remedy 1. Conduct quiescent current measurement. DO NOT USE A DVOM IN LINE - this will blow the fuse in your meter. Use an amp clamp with either a DVOM or XENTRY Scope and wait until the vehicle has gone to sleep (usually takes 6-10 minutes). Once the vehicle is asleep, observe the quiescent current for 10-15 minutes and note down the values. A stable quiescent current should be less than 50 mA. Values higher than this figure are considered not OK (NOK) and require further analysis. 2. If the quiescent current is higher (> 50 to 100 mA): • Check whether software updates are available for relevant control units: Door control units (DMD (N69/1), DMP (N69/2), DMRL (N69/3), DMRR (N69/4)), EIS (N73/3), PTCU (N127), OHCM (N70), GW (N73/3*1) • After installing the updates: measure the quiescent current again • If the quiescent current is < 50 mA, the vehicle is OK • If the quiescent current is between 50 and 100 mA, continue with step 5 • If the quiescent current is between 100 and 200 mA, continue with step 3 • If the quiescent current is between 200 mA and 1 A, continue with step 4 3. For no-load current values of 100 to 200 mA: • Lock all doors and hood so that the control unit recognizes the door status as "closed" but the doors are open. • Disconnect door separation points (A-pillar connection) when the vehicle is asleep, starting with the driver's side • Document the quiescent current value • If there is no change: Disconnect the door separation point on the front passenger side and note down the value again • If the quiescent current falls below 50 mA after the door separation point is opened, the respective outer door handle must be replaced • If the quiescent current remains low after the relevant door handles have been successfully replaced, please create a TIPS case to the LV/HV inbox and retain the removed door handles for the time being • If the quiescent current does not change after the door separation point is opened, please carry out step 5 4. For quiescent current values between 200 mA and 1 A: • Important: Before pulling out F320 and F304, the tow-away protection and interior protection must be deactivated to prevent an alarm from triggering • Lock all doors and hood so that the control unit recognizes the door status as "closed" but the doors are open. • Wait until the vehicle has gone to sleep • Pull out the fuses one after the other, starting with F323 (PTCU CU/N127), and note down the quiescent current value • Perform the same test one at a time if the value is still high for each additional fuse: F119 (PTCU CU/N127), F324 (EIS CU/N73/3), F305 (EIS CU/N73/3), F320 (OCP CU/N70), F304 (OCP CU/N70) • If pulling out the fuse reduces the quiescent current to below 50 mA, replace the corresponding control unit. After replacing, please measure and assess the quiescent current again • Please create a TIPS case for information purposes • If the quiescent current remains unchanged after the fuses listed above are pulled out, please carry out step 5 5. If the quiescent current remains above 50 mA after all controls have been implemented: • Create a TIPS case • Document all the completed steps and measurement results • Attach the XENTRY Scope trace of the draws that you have seen and identify where certain steps were taken. • Attach the latest N73 and N73/3*1 CUL's • If the quiescent current is higher than 1 A, the bus keep awake control unit should be identified via the EIS gateway |
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| LI54.10-P-080053 | 2025-12-03. Service bulletin. ELECTRICAL SYSTEM. Complaint Discharge of 12 V battery in the event of a longer non-operational time - model series 232 and model series 192 Cause Increased quiescent current Remedy 1. Conduct quiescent current measurement. DO NOT USE A DVOM IN LINE - this will blow the fuse in your meter. Use an amp clamp with either a DVOM or XENTRY Scope and wait until the vehicle has gone to sleep (usually takes 6-10 minutes). Once the vehicle is asleep, observe the quiescent current for 10-15 minutes and note down the values. A stable quiescent current should be less than 50 mA. Values higher than this figure are considered not OK (NOK) and require further analysis. 2. If the quiescent current is higher (> 50 to 100 mA): • Check whether software updates are available for relevant control units: Door control units (DMD (N69/1), DMP (N69/2), DMRL (N69/3), DMRR (N69/4)), EIS (N73/3), PTCU (N127), OHCM (N70), GW (N73/3*1) • After installing the updates: measure the quiescent current again • If the quiescent current is < 50 mA, the vehicle is OK • If the quiescent current is between 50 and 100 mA, continue with step 5 • If the quiescent current is between 100 and 200 mA, continue with step 3 • If the quiescent current is between 200 mA and 1 A, continue with step 4 3. For no-load current values of 100 to 200 mA: • Lock all doors and hood so that the control unit recognizes the door status as "closed" but the doors are open. • Disconnect door separation points (A-pillar connection) when the vehicle is asleep, starting with the driver's side • Document the quiescent current value • If there is no change: Disconnect the door separation point on the front passenger side and note down the value again • If the quiescent current falls below 50 mA after the door separation point is opened, the respective outer door handle must be replaced • If the quiescent current remains low after the relevant door handles have been successfully replaced, please create a TIPS case to the LV/HV inbox and retain the removed door handles for the time being • If the quiescent current does not change after the door separation point is opened, please carry out step 5 4. For quiescent current values between 200 mA and 1 A: • Important: Before pulling out F320 and F304, the tow-away protection and interior protection must be deactivated to prevent an alarm from triggering • Lock all doors and hood so that the control unit recognizes the door status as "closed" but the doors are open. • Wait until the vehicle has gone to sleep • Pull out the fuses one after the other, starting with F323 (PTCU CU/N127), and note down the quiescent current value • Perform the same test one at a time if the value is still high for each additional fuse: F119 (PTCU CU/N127), F324 (EIS CU/N73/3), F305 (EIS CU/N73/3), F320 (OCP CU/N70), F304 (OCP CU/N70) • If pulling out the fuse reduces the quiescent current to below 50 mA, it must be replaced. After replacing the fuse, please measure and assess the quiescent current again • Please create a TIPS case for information purposes • If the quiescent current remains unchanged after the fuses listed above are pulled out, please carry out step 5 5. If the quiescent current remains above 50 mA after all controls have been implemented: • Create a TIPS case • Document all the completed steps and measurement results • Attach the XENTRY Scope trace of the draws that you have seen and identify where certain steps were taken. • Attach the latest N73 and N73/3*1 CUL's • If the quiescent current is higher than 1 A, the bus keep awake control unit should be identified via the EIS gateway |
| LI33.30-P-056665 | 2025-11-20. Service bulletin. POWER TRAIN. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa). Note: Sound file in attachment Cause If the complaint is eliminated by experimentally loosening the outboard collar nut (by 1 turn), the problem is due to micromovement in the connection between the wheel bearing inner race and the joint housing of the side shaft. Note: The collar nut must always be replaced after being loosened and must be tightened to the specified torque. Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove outboard side shafts (extract outer joint gearing from wheel hub) 2. Clean contact surface A (see picture file in attachment "Outer joint housing before") before coating with Molykote, using "spirit" (free of dust and grease) 3. Coat contact surface A (see image file in attachment "Outer joint housing after") using Molykote and leave to dry for one hour in removed condition 4. Reinstall side shafts Note: Before using the antifriction coating (Molykote), stir or shake it well (for at least 1 minute). |
| LI27.35-P-079971 | 2025-11-11. Service bulletin. POWER TRAIN. Complaint Possible complaints about shift quality, issues with learning the park lock, and slipping/rinse entries in the EEPROM or Transmission Health system following the replacement of the below components: - The electrohydraulic control unit (EHS valve body) in transmission 725.0/725.1 - The repair kit for the control unit (VGS) in transmission 725.0 Cause Missing, incorrectly installed, or damaged guide tubes on the EHS valve body. Remedy Check for the correct installation of the guide tubes (refer to attachments under “Cause”), correct installation if necessary. Parts Catalog References: NAG3M 725.1 AND NAG3C 725.0 (AMG only): Part numbers 100, 120, 150, 160 NAG3C 725.0 (Non AMG): Part numbers 280, 290, 330, 340 NOTE: If any of these guide tubes are not installed and the vehicle is driven, it will create several rinse and slipping events in the EEPROM data. These values caused by incorrect installation need to be erased to prevent future misdiagnosis. Submit a TIPS case to the Powertrain inbox with the following to receive the necessary reset password: - Initial Quick Test w/ Freeze frame data - VGS Control Unit Log - IPR Result - Initial EEPROM data (before repairs) - Latest EEPROM data - Photo of oil level ultrasonic measurement next to XENTRY specifications Please provide detail regarding the reasoning for the initial replacement in your workshop findings and measures performed. (This topic was covered in the July 2022 and July 2024 Passenger Car Tech Topics) |
| LI27.10-P-075869 | 2025-11-06. Service bulletin. POWER TRAIN. Complaint Only vehicles with a variable transfer case are affected. This can be identified through control unit N45 or N15/7 in the quick test. When accelerating with light load, vibrations or jolting sensation may come from the drivetrain. It may be mistaken for a harsh shift. Cause Modified oil quality of the transfer case over time Remedy 1. Check initial quick test for faults in the following control units. N45 or N15/7 - All-wheel drive (ARS) N127 - 'Drivetrain' (PTCU) control unit Y3/8 - Transmission control for 9-gear transmission (VGS) N3/10 - Engine electronics for combustion engine If faults are present: Process them as per the guided test in Xentry. If no faults are present: 2. Check the transmission oil level If the oil level is correct: 3. Unplug the connector for the transfer cases control unit and reassess the vehicle on a subsequent test drive If the complaint no longer occurs with the control unit disconnected: 4. Perform an oil change of the transfer case according to WIS specifications - Collect an oil sample of the original fluid 5. Complete all transfer case Tech-in processes located under VG Control Unit > Adaptations - Resetting the oil service data - Calibration of N15/7 5. Perform road test of vehicle to bring transmission to operating temperature ( >60C ) 6. Operate vehicle in full circle with steering at full lock - 5x to the left - 5x to the right 7. Perform an extended 200mi road test to ensure the clutches are properly conditioned with the new oil. 8. Reassess the concern and release the vehicle if no longer present. If the concern continues to occur with the control unit disconnected or after the above steps have been performed, please submit a TIPS case to the Powertrain inbox with the following information: - Initial quick test with fault freeze frame data - Initial transmission EEPROM data - VGS and Transfer Case Control Unit Log (N45 or N15/7) - Photo of the original oil condition - What color was the fluid drained from the transfer case before the oil change? - Was an oil sample collected, and can you provide a photo of the original fluid? - What color and part number fluid was used during the oil change? - How far was the vehicle driven after? |
| LI42.10-P-079904 | 2025-10-21. Service bulletin. SERVICE BRAKES. Complaint At low speeds and light brake pressure, brakes will make a groaning or honking noise. Cause Frictional vibrations with very light brake pressure/modulations. Remedy This condition can be duplicated on most vehicles. To validate, use a like for like reference vehicle. The noise is normal behavior under the conditions listed. With very light brake pressure this noise can be induced/caused due to normal brake pad and brake rotor vibrations. Exchanging brake components will not rectify. |
| LI35.31-P-079847 | 2025-10-07. Service bulletin. POWER TRAIN. Complaint Complaints of oil leaking from rear differential oil pan area. Cause In the groove where the pan seal is placed, there may be imperfections (porosity) in the casting causing fluid to leak past the seal. The supplier states this only affects rear differentials with 2023 production date. The production date can be found stamped on the housing cover (see attachment). Remedy 1. Follow the attached instructions to inspect the rear differential cover for porosity. 2. Repair the vehicle with the applicable repair kit for the chassis. - The new oil pans that come with the repair kit should be produced in 2024 and not have this issue. *When submitting the claim, please reference this LI document and if porosity was found.* |
| NCU - 2025090010 | 2025-09-26. Service campaign. ELECTRICAL SYSTEM. Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the Electronic Ignition Lock control unit coding does not correspond to current series production configuration. As a result, battery management could be affected and cause low battery voltage. A 12V battery message may appear in the instrument cluster after the vehicle has been dormant for an extended period of time. Remedy MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will SCN code the Electronic Ignition Lock control unit. The new SCN coding improves battery management, improving the efficiency of the 12V electrical system. |
| LI54.10-P-071499 | 2025-09-25. Service bulletin. ELECTRICAL SYSTEM. Complaint The result from the XENTRY battery test does not match the current state of the battery. Cause The XENTRY battery tester uses the stored on-board electrical system data in the SAM module to access the health of the 12 volt battery. The XENTRY battery test may not take into account a single discharge event because the SAM or EZS cannot record the data if the battery is discharged. Note: A discharged battery does not necessarily need to be replaced. A discharged battery may be recovered with no permanent damage. Remedy 1) If the battery is discharged, charge the battery. Review WS54.00-P-0037B for minimum charger specifications. • Note the amperage difference between trickle (maintainer) chargers of at least 16A and quick chargers of at least 30A. • Review AP54.10-P-5449U. Note when battery is sufficiently charged the charger current is less 5A. 2) While charging the battery, analyze the vehicle data to determine root cause of discharge using the following data points: • NOTE: For guidance on use of the on-board electrical data please review the AKUBIS video titled "New onboard electrical system diagnosis shown on BR 166". The video can be accessed through WIS by following the path WSM--> content by model series --> passenger cars --> ML-Class --> Model 166 --> group 54 --> New onboard electrical system diagnosis. • Refer to the March 2023 PCTT for the video walkthrough of analysis as well as the attachment of the slides to this Li. • Review GF54.10-P-1012A regarding what can cause deep discharge protection to not end a battery draw. • Review SI54.10-P-0024A for proper maintenance of the vehicle. For Star 2 vehicles: -Review FSAM on-board electrical data conspicuous records • NOTE: This data can be found via FSAM N10/6 -> Actual Values -> On-board electrical system -> On-board electrical system data For Star 3 vehicles: -Review N73/3 EZS on-board electrical data conspicuous records • NOTE: This data can be found via EZS N73/3 -> Actual Values -> On-board electrical system -> On-board electrical system data 3) Determine if root cause is due to: • vehicle technical issue? • customer behavior? NOTE: Recommend using battery analysis sheet found in XiW -> Local Contents -> Diagnostic info -> Battery Discharge Worksheet 4) If battery still does not accept charge AND the vehicle does not fall within the parameters of improper maintenance, then create a TIPS case. *IMPORTANT* - If the improper maintenance/use is found during diagnosis, DO NOT open a TIPS case. If a TIPS case is opened, it will be marked 1 star and directed to your assigned FSE for review. TIPS Case must include with the case: • Amperage setting of charger and time battery was on charger • XENTRY Battery Tester results • Voltage of battery taken with multimeter: Do not connect charger while taking measurements • N10/6 FSAM, (N73 or N73/3) and (N73*1 or N73/3*1) • Workshop analysis of conspicuous data • Root cause analysis for battery discharge based on the above documents (technical, customer, etc.) • NOTE: For expedited results when creating a case write customer complaint as "XENTRY Battery Tester implausible". |
| LI54.10-P-069698 | 2025-09-22. Service bulletin. ELECTRICAL SYSTEM. See Attachment |
| LI00.00-P-079603 | 2025-09-17. Service bulletin. ELECTRICAL SYSTEM. Complaint The OTA software update prepares the SRS/ORC controller and enables it to be updated remotely in the future. Based on technician feedback, the OTA (code: 25P5496529) does not start even after an extended period of time and several driving cycles. In addition, the "Continue" button is grayed out. Cause The exact cause for the OTA not to start is currently under analysis. Remedy Please check whether the vehicle is affected by the field measure "Update software of Supplemental Restraint System (SRS) control unit" (code: 25P5496529) and if yes, perform this update using a XENTRY with all latest Add-Ons and bill under accounting number 5496529. If the vehicle is not affected by this field measure, in the event of a complaint update control unit ORC223 (N2/5 -Supplemental Restraint System SRS) using XENTRY and use damage code 8251M01. As of XENTRY Release Version 06/25, control unit ORC223 can also be updated in this context without a password. Provided control unit ORC223 is error-free after the update, the vehicle can be handed back. ***IMPORTANT*** -In isolated cases, the OTA update may continue to be displayed for up to 3-4 weeks even after flashing with XENTRY. Note: This LI applies only to the OTA update for occupant protection! |
| LI54.10-P-079772 | 2025-09-12. Service bulletin. ELECTRICAL SYSTEM. Complaint After a software update of component LIB48_222 - G1/3 (48 V on-board electrical system battery) from software release A 000 902 50 48 to software release A 000 902 15 89, the fault code B183319 may be output. B183319 "The battery for the 48V on-board electrical system has a malfunction. The limit value for current has been exceeded" Cause Anomaly in the software update Remedy Please perform the following steps in the specified sequence: 1.) Delete fault codes 2.) Disconnect XENTRY Diagnosis and the 12 V battery charger 3.) Disconnect ground cable from the 12 V battery 4.) Ensure bus idle for at least 10 minutes 5.) Re-connect ground cable to the 12 V battery 6.) Delete fault codes again 7.) Perform a test drive 8.) Check fault codes > If fault code B183319 is still current, continue with the guided fault analysis in XENTRY Diagnosis. > If fault code B183319 goes to stored and can be cleared, no further action is required. |
| LI00.00-P-079603 | 2025-09-09. Service bulletin. ELECTRICAL SYSTEM. Complaint The OTA software update prepares the SRS/ORC controller and enables it to be updated remotely in the future. Based on technician feedback, the OTA (code: 25P5496529) does not start even after an extended period of time and several driving cycles. In addition, the "Continue" button is grayed out. Cause The exact cause for the OTA not to start is currently under analysis. Remedy Please check whether the vehicle is affected by the field measure "Update software of Supplemental Restraint System (SRS) control unit" (code: 25P5496529) and if yes, perform this update using a XENTRY with all latest Add-Ons and bill under accounting number 5496529. If the vehicle is not affected by this field measure, in the event of a complaint update control unit ORC223 using XENTRY and use damage code 8251M01. As of XENTRY Release Version 06/25, control unit ORC223 can also be updated in this context without a password. Provided control unit ORC223 is error-free after the update, the vehicle can be handed back. ***IMPORTANT*** -In isolated cases, the OTA update may continue to be displayed for up to 3-4 weeks even after flashing with XENTRY. Note: This LI applies only to the OTA update for occupant protection! |
| OTA - 20250905 | 2025-09-05. Over-the-air update. ELECTRICAL SYSTEM. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, there is a new software release for the MBUX Infotainment system. An OTA update will enhance both functionality and entertainment features. The update introduces Dolby Atmos support for in-car apps, improvements to the MBUX calendar app, and the launch of MBUX SOUND DRIVE. To deliver a better music streaming experience, new apps will be installed and existing integrations with online streaming providers will be removed. Each provider will now require a separate app, which will be installed during the update. MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit. |
| NCU - 2025080003 | 2025-08-28. Service campaign. ELECTRICAL SYSTEM. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the Battery Management System control unit software does not correspond to current production specifications. As a result, the battery Malfunction Indicator Lamp (MIL) may illuminate when no system fault occurs. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the Battery Management System control unit software. |
| LI46.10-P-079582 | 2025-08-21. Service bulletin. STEERING. Complaint Valeo Steering Column Module (N80) goes into bootloader after updating software to A2239028729. To verify the supplier and software number of the steering column module. See attachment "Supplier Identification" for assistance. Cause MRSM/SCCM flashed to SW A2239028729 Remedy Please send VIN specific ID1 Support Package online using the XENTRY Kit used during the time the error occurred. Then, create an XSS ticket using the Support Tool icon under XENTRY Diagnosis. |
| LI15.40-P-077947 | 2025-08-15. Service bulletin. ENGINE. Complaint Combustion engine could no longer be started, only electric driving possible Cause High-voltage belt-driven starter-alternator defective Remedy Requirement: Before carrying out test work, it must be ensured that the person performing the work has successfully completed the required qualification for work on the high-voltage system. Note: In order to check whether the high-voltage belt-driven starter-alternator is defective, please carry out the test below. If the fault "P0E2F00 The electrical fuse B for the high voltage has a malfunction" is stored in the N82/10 BMS control unit, the HV protocol must be checked to see whether the fuse for the auxiliary consumers is defective. In this case, the high-voltage battery must be replaced after the short circuit has been eliminated. (See attachment) The defective high-voltage belt-driven starter-alternator must always be sent back via the existing return delivery process for analysis. Check: Please disconnect the high-voltage plug at the high-voltage belt-driven starter-alternator and connect test adapter 000 589 94 63 00. Measure resistance HV+ to HV-. If the final measurement result is between 0–1 ohm, the high-voltage belt-driven starter-alternator with the short circuit must be replaced. If either one of or both the fault codes P0C0B16 and P0C0B17 are saved in the high-voltage belt-driven starter-alternator control unit G2/3, please replace the high-voltage belt-driven starter-alternator, since no short circuit can be measured here and this therefore concerns a hardware defect. Please check the serial number on the silver adhesive label below the SW number on the front of the high-voltage belt-driven starter-alternator. Example: 2314300044 (the first 10 digits, see attachment) Important note: If the number is greater than 2329100027, a TIPS case must be created. In this instance, please attach the following documents to the TIPS case: • Quick test • High-voltage event log • Picture of the silver adhesive label on the front of the high-voltage belt-driven starter-alternator (serial number) • Attach the measurement results with pictures |
| LI47.70-P-078563 | 2025-08-01. Service bulletin. ELECTRICAL SYSTEM. Complaint - Engine diagnosis indicator lamp (MIL) lights up. - Current and saved fault code in DCCU and powertrain control unit (PTCU): P2E9873 The position sensor of the external socket flap of the vehicle socket (direct current) indicates an electrical fault. The actuator does not open. - The vehicle starts or charges normally and without any problems. Cause Software in the control unit "N116/5 - DC charge-connection unit (DCCU)". Remedy For model series 167, 254 (Only for USA): • Remedy is available: • Update software for N116/5 (DC charging control unit box) and perform SCN coding of N116/5. • Once the SCN coding has been updated, the engine diagnosis indicator lamp (MIL) is no longer actuated with this fault code. For Model Series 214: • Ensure N116/5 DCDC has latest software. • Perform SCN coding of the PTCU controller. • If MIL is still active, please open TIPS case and send to Body/Chassis/Entertainment inbox. For other model series: • Work on the SW remedy for N116/5 (DC charging control unit box) is in progress. • Once the software is available, update the software for N116/5 and perform SCN coding of N116/5. • If this problem occurs, the vehicle start or charging functions are normally not affected; therefore do not replace any parts. • Replacing parts does not solve this problem. |
| LI46.10-P-078012 | 2025-08-01. Service bulletin. LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. Complaint Hand detection system not operating correctly / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" Cause Possible causes: the hand detection mat, the hand detection control unit, the contacts and the steering wheel harness. Remedy In the event of a customer complaint and fault code in IDC control unit: U186B29 in IDC223 or fault code U0429E0, U042941, U042929, U042902, U0429E1 in IDC213 or fault code in HOSWD control unit: B1E7614 Test: Please perform the new SCN coding for HOSWD control unit (N179/1) (available since May 2025). Please flash the IDC (N62/4) software A223 902 75 37 (only applies to HOSWD223). Erase fault memory Remedy: Switch on ignition without touching the steering wheel. If after 10 seconds without touching the steering wheel, one of the two fault messages appears in the IC: Please check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. (example in picture 2 and 3). If there is visible damage -> replace steering wheel electronics or feed lines. If there is no visible damage -> Proceed to replace the steering wheel. If no yellow message appears in the instrument cluster within 10 seconds: Please grab the steering wheel all the way round, including the 6 o'clock chrome molding, with both hands (see picture 1). If the fault is triggered by grabbing the steering wheel rim or pressing on the 6 o'clock clasp, check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. (example in picture 2 and 3). Check ground connections (screw connections and cable to steering wheel rim); if necessary tighten screws/bolts and check for corrosion (Picture 4). If there is visible damage -> replace steering wheel electronics or feed lines. If no fault is visible -> Proceed to replace the steering wheel. In the event of a customer complaint and further fault code in HOSWD: B1E7713: Check ground connections (screw connections and cable to steering wheel rim); if necessary tighten screws/bolts and check for corrosion (Picture 4). B1F1F04: Check hand detection system control unit; if necessary swap with donor vehicle (ensure that the HW part numbers are identical). |
| LI42.10-P-063502 | 2025-08-01. Service bulletin. SERVICE BRAKES. Complaint Noises/ squealing from the service brake in various driving situations and ambient conditions. Cause Frictional vibrations Remedy The intent of this document is to reduce or eliminate noise from high performance AMG brakes. AMG brakes are designed for performance under high load and in certain scenarios, can emit noise. Some of the scenarios are: • Driving style • Brake pressure and application style (stop-and-go traffic with consistent low brake pressure “riding brakes” where the brakes cannot cool sufficiently between applications). • Ambient temperatures 1. Beginning Diagnostics: a) Check whether the complaint can be reproduced and at which axle or side the noises occur (ideally together with the customer while driving). b) Check the affected system for component wear, mechanical damage or localized overheating damage. Replace damaged components as necessary. c) Assess condition of brake rotors and pads per WIS and visually (i.e. long periods of stagnation, etc...). d) Clean brake components free of brake dust and debris. d) Secure vehicle on a lift. 1. Start the engine and depress the brake pedal 3-4 times. 2. Check each wheel to see if they turn freely by hand. 3. If a wheel is not turning freely by hand, this needs to be addressed prior to re-assessing the noise concern. e) Check whether, apart from this document, an additional document exists for the specific model in question, and if so, work through it and then continue. 2. Specific Axle Work: NOTE: If the brake pad has a metal backing plate, there is no need to affix the adhesive film. Continue with applying chamfer and Molykote as instructed below. IMPORTANT: Be absolutely certain to not allow paste between friction surfaces of the pad and disc! a) If the noises are coming from the front axle. 1. Remove brake linings of front axle. 2. Clean all contact points on brake lining backing plate, including the brake lining guide pins and brake caliper/carrier. 3. Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the piston-side brake lining where the piston contacts the pad backing plate. See picture "Adhesive and Paste Application Area". 4. Be sure to remove both brown paper backing sides of the adhesive film, it is double sided adhesive film. 5. If adhesive is already installed on backing plate where pistons contact the back of the pad, you may gently scrape off and re-apply a new adhesive or Molykote. Must not apply the Molykote on top of the adhesive. 6. Chamfer edges (gently round off sharp leading edges) on brake pads. Some pads have vertical grooves, these can be gently chamfered with a triangular file as well. See picture "Chamfering Technique". 7. Apply Molykote to the sides of the backing plate. See picture "Adhesive and Paste Application Area". 8. After installing the brake linings, actuate the brake for 30 seconds. b) If the noises are coming from the rear axle. 1. Remove brake pads of rear axle. 2. Clean all contact points on brake lining backing plate and brake caliper/carrier. 3. Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the piston-side brake lining. 4. Chamfer edges (round off sharp leading edges) on brake pads. See picture "Chamfering Technique". 5. Grease contact points (red areas on attachment "Rear Pad Grease Area") between brake lining and guide of brake caliper with Molykote. 3. Brake Bedding Process: a) Before trip, the mileage incurred must be clarified with the customer (approx. 30 miles). b) Select a suitable route so speeds of approximately 65 MPH can be achieved. c) If the vehicle is an AMG P3 Hybrid, switch off recouperation prior to bedding in brakes. d) Brake the vehicle 15 times with a brake pressure of approx. 30 bar (have the passenger read it out using XENTRY) from 62 MPH to 30 MPH (no emergency stops and no braking in the ESP control range). Maintain a cooling distance of approx. 1 mile between brake application |
| LI42.10-P-063502 | 2025-08-01. Service bulletin. SERVICE BRAKES. Complaint Noises/ squealing from the service brake in various driving situations and ambient conditions. Cause Frictional vibrations Remedy The intent of this document is to reduce or eliminate noise from high performance AMG brakes. AMG brakes are designed for performance under high load and in certain scenarios, can emit noise. Some of the scenarios are: • Driving style • Brake pressure and application style (stop-and-go traffic with consistent low brake pressure “riding brakes” where the brakes cannot cool sufficiently between applications). • Ambient temperatures 1. Beginning Diagnostics: a) Check whether the complaint can be reproduced and at which axle or side the noises occur (ideally together with the customer while driving). b) Check the affected system for component wear, mechanical damage or localized overheating damage. Replace damaged components as necessary. c) Assess condition of brake rotors and pads per WIS and visually (i.e. long periods of stagnation, etc...). d) Clean brake components free of brake dust and debris. d) Secure vehicle on a lift. 1. Start the engine and depress the brake pedal 3-4 times. 2. Check each wheel to see if they turn freely by hand. 3. If a wheel is not turning freely by hand, this needs to be addressed prior to re-assessing the noise concern. e) Check whether, apart from this document, an additional document exists for the specific model in question, and if so, work through it and then continue. 2. Specific Axle Work: NOTE: If the brake pad has a metal backing plate, there is no need to affix the adhesive film. Continue with applying chamfer and brake paste as instructed below. IMPORTANT: Be absolutely certain to not allow paste between friction surfaces of the pad and disc! a) If the noises are coming from the front axle. 1. Remove brake linings of front axle. 2. Clean all contact points on brake lining backing plate, including the brake lining guide pins and brake caliper/carrier. 3. Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the piston-side brake lining where the piston contacts the pad backing plate. See picture "Adhesive and Paste Application Area". If adhesive is already installed on backing plate, you may gently scrape off and re-apply a new adhesive. In some instances the adhesive may be very carefully removed and Molykote applied instead. 4. Chamfer edges (gently round off sharp leading edges) on brake pads. Some pads have vertical grooves, these can be gently chamfered with a triangular file as well. See picture "Chamfering Technique". 5. Apply Molykote to the sides of the backing plate. See picture "Adhesive and Paste Application Area". 6. After installing the brake linings, actuate the brake for 30 seconds. b) If the noises are coming from the rear axle. 1. Remove brake pads of rear axle. 2. Clean all contact points on brake lining backing plate and brake caliper/carrier. 3. Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the piston-side brake lining. 4. Chamfer edges (round off sharp leading edges) on brake pads. See picture "Chamfering Technique". 5. Grease contact points (red areas on attachment "Rear Pad Grease Area") between brake lining and guide of brake caliper with Molykote. 3. Brake Bedding Process: a) Before trip, the mileage incurred must be clarified with the customer (approx. 30 miles). b) Select a suitable route so speeds of approximately 65 MPH can be achieved. c) If the vehicle is an AMG P3 Hybrid, switch off recouperation prior to bedding in brakes. d) Brake the vehicle 15 times with a brake pressure of approx. 30 bar (have the passenger read it out using XENTRY) from 62 MPH to 30 MPH (no emergency stops and no braking in the ESP control range). Maintain a cooling distance of approx. 1 mile between brake applications. e) Finally drive approx. 3 miles to allow the system to cool. f) Reassess noise. |
| LI01.40-P-079518 | 2025-07-22. Service bulletin. ENGINE. Complaint Customer complains of oil use, oil leaking or oil smell. Upon inspection oil will be seen at or around the rear of the engine and at the engine/transmission interface. Cause Oil leaking from rear main seal and/or rear main seal plate. Remedy If the rear main seal plate has been previously replaced per the instructions in this LI, open a TIPS case before proceeding. Inspect the rear main seal very carefully. Make sure the seal is not sucked in, rolled, or cut (see pictures in attachments). Confirm the leak location is at the rear main seal and/or rear main seal plate by cleaning the area thoroughly and applying trace powder to the suspected area. Allow the vehicle to run either on a lift or at low speed in a controlled environment (do not attempt at high speed or in wet areas as this will make the results difficult to assess). If the leak is emanating from the seal: replace both air/oil separators. Then clean the bellhousing area completely and test with trace powder again to see if the leak remains. If it doesn't, release the car. If the leak remains pull the rear main seal plate, clean the block mating surface completely and replace the rear main seal plate and rear main seal. When the new seal is installed make sure the sealant path is followed exactly as it is shown per the drawing in the attachments. Apply the sealant to the BLOCK instead of the plate to ensure adequate coverage is attained. After installation lubricate a feeler gauge with oil and run it between the rear main seal and the crank to clear any small debris that may be present and to break any binding or stiction. |
| LI00.01-P-078887 | 2025-06-26. Service bulletin. UNKNOWN OR OTHER. Complaint The intent of this document is to provide workshops with helpful technical reference language. • Commonly used acronyms in LI's and TIPS cases. • Control unit names, numbers, and how to identify. • Network/wiring architecture groups to baumuster quick reference. • Platform to baumuster quick reference. Cause Information only Remedy Acronyms: • AV = Actual Values • CU = Control Unit • CUL = Control Unit Log • DTC = Diagnostic Trouble Code • E-Stand = Fresh-up head unit boot software (found in head unit control unit log) • FUP = Fresh-up • FW = Firmware • HSVL = High Speed Video Line • HU = Head Unit • HW = Hardware • IPD = Injector Performance Data • ISU = Initial Start Up • LVDS = Low Voltage Differential Signal • NSFT = Not Safe For Transport • MOPF = Model Facelift (Ex: 167 MOPF) • PiH = Plug-in Hybrid • P3 Hybrid = AMG Plug-in Hybrid with rear drive unit • SA Code = Sonderausstattungscode (Option Code) • SCN = Software Calibration Number SW = Software • TCU = Telecommunication Control Unit (Hermes/Ramses/Etc...) • QT = Quicktest • XD = XENTRY Diagnosis Control Unit Identification: Refer to the attachment "Control Unit Nomenclature" for location of each. • Control Unit Name • Control Unit Number • Control Unit Short name • Control Unit Diogenes ("dy-oj-uh-neez") name - Control unit variant/family. Network/Wiring Architecture to Baumuster Quick Reference: MFA = "Mercedes-Benz Frontwheel Architecture" • 117 • 156 • 246 MFA2 = "Mercedes-Benz Frontwheel Architecture - Generation 2" • 118 • 177 • 243 • 247 EVA1.5 = "Electric Vehicle Architecture" • 243 EVA2 = "Electric Vehicle Architecture - Generation 2" • 294 • 295 • 296 • 297 MSA = "Mercedes-Benz Sport Architecture" • 192 • 232 MMA = "Mercedes-Benz Modular Architecture" • 174 Star 1 • 117, 156, 246 (MFA) • 166, 176, 221, 242, 246, 292 Star 2 • 205, 213, 238, 253, 257, 290 (MRA) • 117, 156, 246 (MFA) • 118, 177, 243, 247 (MFA2) • 167, 222, 292, 463, 465, 906 Star 3 • 294, 295, 296, 297 (EVA2) • 206, 214, 223, 236, 254 (MRA2) • 192 and 232 (MSA) • 907 Platform to Baumuster Quick Reference: MRA = "Mercedes-Benz Rearwheel Architecture": • 205 • 213 • 222 • 238 • 253 • 257 • 290 MRA2 = "Mercedes-Benz Rearwheel Architecture - Generation 2": • 206 • 214 • 223 • 236 • 254 MFA = "Mercedes-Benz Frontwheel Architecture" • 117 • 156 • 246 MFA2 = "Mercedes-Benz Frontwheel Architecture - Generation 2" • 118 • 177 • 243 • 247 EVA1.5 = "Electric Vehicle Architecture" • 243 EVA2 = "Electric Vehicle Architecture - Generation 2" • 294 • 295 • 296 • 297 MSA = "Mercedes-Benz Sport Architecture" • 192 • 232 MMA = "Mercedes-Benz Modular Architecture" • 174 |
| LI33.30-P-056665 | 2025-06-03. Service bulletin. POWER TRAIN. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa). Note: Sound file in attachment Cause If the complaint is eliminated by experimentally loosening the outboard collar nut (by 1 turn), the problem is due to micromovement in the connection between the wheel bearing inner race and the joint housing of the side shaft. Note: The collar nut must always be replaced after being loosened and must be tightened to the specified torque. Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove outboard side shafts (extract outer joint gearing from wheel hub) 2. Clean contact surface A (see image file in attachment "Outer joint housing before") before coating with Molykote, using "spirit" (free of dust and grease) 3. Coat contact surface A (see image file in attachment "Outer joint housing after") using Molykote and leave to dry for one hour in removed condition 4. Reinstall side shafts |
| LI54.71-P-078802 | 2025-05-30. Service bulletin. ELECTRICAL SYSTEM. Complaint MBUX head unit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or (549+U19). Cause Head unit software variant. Remedy For all chassis use Xentry to update head unit (A26/17). Target boot software number should be either: • 247 904 6600 (E905.4) OR • 247 904 7500 (E906.1) If vehicle fits all criteria and either target software is not available via Xentry, please open an XSS ticket. Damage code 5424x-01 may be used with a repair start date after June 2nd, 2025. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.