Service bulletin LI27.00-P-073124
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 11037616 |
| Published by NHTSA | 2026-09-30 |
| Manufacturer's number | LI27.00-P-073124 |
| Manufacturer's date | 2026-09-04 |
| NHTSA component | POWER TRAIN |
NHTSA's summary
Complaint Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G‑TRONIC automatic transmission) and 725.1 (NAG3 facelift/9G‑TRONIC automatic transmission facelift) For faster, more effective and more targeted diagnosis, Intelligent Predictive Repair (IPR) has been developed and integrated into XENTRY Diagnosis. This ensures an automated diagnosis process. Cause As part of the on‑going quality monitoring process and associated quality and damaged part appraisals, a high number of ineffective repairs have been discovered. Such ineffective repairs have a negative impact on all those involved. For the customer, it means high costs and long repair times and for the dealer, it may result in the warranty claim being rejected. Remedy General note: IPR is available for: NAG3 Classic (automatic transmission 725.0) NAG3 ‑ AMG sports models (AMG 43 and AMG 53 with converter) NAG3 ‑ AMG 63 NAG3 ‑ Hybrid NAG3 Facelift (automatic transmission 725.1) NAG3 facelift (725.1) with engine 139/177 (AMG 43/63) Steps for the Service Advisor: Important: The more information and detail that can be given to the workshop about the complaint, then the more effective the subsequent diagnosis with IPR can be. To this end, a detailed service reception questionnaire has been provided to help the Service Advisor ask the right questions about the complaint. ·Ask precise details about the customer complaint and the conditions and context. ·Fill out the service reception questionnaire (please see WIS document: OF27. 00‑P‑3000‑05A) for customer complaints in detail and forward it to the workshop. Operation steps for the workshop employee: Perform quick test ·Access the transmission control unit via XENTRY Diagnosis ·Select "A customer complaint has been received" and carry out all subsequent operation steps (IPR diagnosis path). ·The IPR repair instructions are displayed. Carry out the IPR repair instructions without performing any further diagnostic or repair steps. ·Important: The IPR repair instructions are binding and must be carried out. Differing repairs are possible; such repairs must be documented in XENTRY in free text. Please observe the information regarding the IPR diagnosis process in XENTRY. ·Conventional diagnosis and subsequent appropriate repairs are only permitted if IPR does not specify any repair instructions. ·Invoicing for the guided IPR steps: Operation item 27‑0640 and 0.1 hours !!!!! Notice regarding warranty: !!!!! ·The use of IPR in association with warranty claims is mandatory! ·If the IPR repair instructions are disregarded without justification, the warranty claims may be rejected and/or are subject to debit. IPR will provide a measure to repair the vehicle based on various data sources (EEPROM, fault codes, etc). Please consider the vehicle maintenance record of the vehicle. For warranty and goodwill repairs, the transmission ECU test log and/or IPR test result must be uploaded into Paperless XENTRY Diagnosis (pXD) . If repair is being determined based of oil pan condition pictures of oil pan MUST be provided to warranty as justification. ·Tamper‑proof documentation: The IPR repair instructions are stored in the control unit log. Please file this document in a tamperproof manner ‑ either in digital form or as a hard‑copy printout and also enclose a printout with the damaged part. In this regard, please comply with the country‑specific warranty requirements of the MPC/general distributor.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Transmission and driveline
| MERCEDES BENZ AMG GLE53 4MATIC | 2025 |
|---|---|
| MERCEDES BENZ C 300 4MATIC | 2018 |
| MERCEDES BENZ GLE 350 | 2025 |
| MERCEDES-BENZ AMG C43 | 2016 to 2022 |
| MERCEDES-BENZ AMG CLS53 | 2019 to 2021 |
| MERCEDES-BENZ AMG E43 | 2017 to 2018 |
| MERCEDES-BENZ AMG E53 | 2019 to 2023 |
| MERCEDES-BENZ AMG GLC43 | 2017 to 2023 |
| MERCEDES-BENZ AMG GLC63 | 2021 |
| MERCEDES-BENZ AMG GLE43 | 2016 to 2021 |
| MERCEDES-BENZ AMG GLE53 | 2021 to 2022 |
| MERCEDES-BENZ AMG GLE53 4MATIC | 2023 |
| MERCEDES-BENZ AMG GLE53 4MATIC+ | 2023 to 2025 |
| MERCEDES-BENZ AMG GLE53 4MATIC+ COUPE | 2023 to 2025 |
| MERCEDES-BENZ AMG GLE53 COUPE | 2021 to 2022 |
| MERCEDES-BENZ AMG GT43 | 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT53 | 2019, 2020, 2021, 2022, 2023, 2024, 2025 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 | 2024, 2025 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 4MATIC+ | 2025 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG S63 | 2017 to 2021 |
| MERCEDES-BENZ AMG SLC43 | 2017 to 2020 |
| MERCEDES-BENZ C 300 | 2017 to 2025 |
| MERCEDES-BENZ C 300 4MATIC | 2021 to 2025 |
| MERCEDES-BENZ C 350 E | 2019 to 2020 |
| MERCEDES-BENZ C450 | 2016 to 2017 |
| MERCEDES-BENZ CLS 450 | 2019 to 2023 |
| MERCEDES-BENZ CLS 550 | 2016 |
| MERCEDES-BENZ CLS 550 | 2018 |
| MERCEDES-BENZ CLS550 | 2015 |
| MERCEDES-BENZ CLS550 | 2017 |
| MERCEDES-BENZ E 300 | 2018 to 2019 |
| MERCEDES-BENZ E 350 | 2020 to 2023 |
| MERCEDES-BENZ E 400 | 2018 |
| MERCEDES-BENZ E 400 4MATIC | 2018 |
| MERCEDES-BENZ E 400 4MATIC CABRIOLET | 2018 |
| MERCEDES-BENZ E 400 4MATIC COUPE | 2018 |
| MERCEDES-BENZ E 400 4MATIC WAGON | 2018 |
| MERCEDES-BENZ E 450 | 2019 to 2023 |
| MERCEDES-BENZ E 450 4MATIC | 2019 to 2020 |
| MERCEDES-BENZ E 450 4MATIC | 2023 |
| MERCEDES-BENZ E 450 4MATIC CABRIOLET | 2019 to 2020 |
| MERCEDES-BENZ E 450 4MATIC COUPE | 2019 to 2020 |
| MERCEDES-BENZ E 450 4MATIC WAGON | 2019 to 2020 |
| MERCEDES-BENZ E300 | 2016 to 2017 |
| MERCEDES-BENZ E400 | 2016 to 2017 |
| MERCEDES-BENZ G 550 | 2019 to 2024 |
| MERCEDES-BENZ GL350 | 2017 |
| MERCEDES-BENZ GL450 | 2017 |
| MERCEDES-BENZ GL550 | 2017 |
| MERCEDES-BENZ GLC 300 | 2018 to 2023 |
| MERCEDES-BENZ GLC 300 4MATIC | 2023 |
| MERCEDES-BENZ GLC 350 E | 2020 to 2021 |
| MERCEDES-BENZ GLC300 | 2016 to 2017 |
| MERCEDES-BENZ GLE 350 | 2019 to 2024 |
| MERCEDES-BENZ GLE 350 4MATIC | 2021 to 2025 |
| MERCEDES-BENZ GLE 350 4MATIC COUPE | 2021 to 2022 |
| MERCEDES-BENZ GLE 350 E | 2020 to 2021 |
| MERCEDES-BENZ GLE 400 | 2018 to 2019 |
| MERCEDES-BENZ GLE 450 | 2020 to 2024 |
| MERCEDES-BENZ GLE 450 4MATIC | 2021 to 2025 |
| MERCEDES-BENZ GLE 450 4MATIC COUPE | 2021 to 2022 |
| MERCEDES-BENZ GLE 450 4MATIC COUPE | 2025 |
| MERCEDES-BENZ GLE 450E 4MATIC | 2024 to 2025 |
| MERCEDES-BENZ GLE 580 | 2020 to 2021 |
| MERCEDES-BENZ GLE 580 4MATIC | 2021 to 2023 |
| MERCEDES-BENZ GLE 580 4MATIC COUPE | 2021 to 2022 |
| MERCEDES-BENZ GLE350D | 2016 |
| MERCEDES-BENZ GLE400 | 2016 to 2017 |
| MERCEDES-BENZ GLE450 | 2016 to 2017 |
| MERCEDES-BENZ GLS 450 | 2018 to 2020 |
| MERCEDES-BENZ GLS 450 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ GLS 550 | 2018 to 2019 |
| MERCEDES-BENZ GLS 580 4MATIC | 2020 |
| MERCEDES-BENZ GLS 580 4MATIC | 2022 to 2023 |
| MERCEDES-BENZ GLS 600 | 2023 |
| MERCEDES-BENZ GLS350D | 2017 |
| MERCEDES-BENZ GLS450 | 2017 |
| MERCEDES-BENZ GLS450 | 2021 |
| MERCEDES-BENZ GLS550 | 2017 |
| MERCEDES-BENZ GLS580 | 2021 |
| MERCEDES-BENZ ML350 | 2015 |
| MERCEDES-BENZ S 450 | 2018 to 2020 |
| MERCEDES-BENZ S 450 4MATIC | 2018 to 2020 |
| MERCEDES-BENZ S 500 | 2021 |
| MERCEDES-BENZ S 500 | 2023 |
| MERCEDES-BENZ S 500 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ S 560 | 2021 |
| MERCEDES-BENZ S 560 4MATIC | 2018 to 2020 |
| MERCEDES-BENZ S 560 4MATIC COUPE | 2018 to 2020 |
| MERCEDES-BENZ S 560 E | 2019 to 2020 |
| MERCEDES-BENZ S 580 | 2021 |
| MERCEDES-BENZ S 580 | 2023 |
| MERCEDES-BENZ S 580 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ S 580 E | 2023 |
| MERCEDES-BENZ S 580 E 4MATIC | 2023 to 2025 |
| MERCEDES-BENZ S550 | 2016 to 2017 |
| MERCEDES-BENZ S550 4MATIC | 2016 to 2017 |
| MERCEDES-BENZ S63 | 2017 |
| MERCEDES-BENZ SL 450 | 2018 to 2020 |
| MERCEDES-BENZ SL 550 | 2018 to 2020 |
| MERCEDES-BENZ SL450 | 2017 |
| MERCEDES-BENZ SL550 | 2017 |
| MERCEDES-BENZ SLC 300 | 2018 to 2020 |
| MERCEDES-BENZ SLC 43 AMG | 2017 |
| MERCEDES-BENZ SLC300 | 2016 to 2017 |
| MERCEDES-BENZ SLK300 | 2016 |
| MERCEDES-MAYBACH GLS 600 | 2021 |
| MERCEDES-MAYBACH GLS 600 4MATIC | 2022 to 2025 |
| MERCEDES-MAYBACH S 560 | 2021 |
| MERCEDES-MAYBACH S 560 4MATIC | 2018 to 2020 |
| MERCEDES-MAYBACH S 580 | 2021 |
| MERCEDES-MAYBACH S 580 4MATIC | 2022 to 2025 |
| MERCEDES-MAYBACH S 680 | 2023 to 2024 |
| MERCEDES-MAYBACH S 680 4MATIC | 2022 to 2025 |
| MERCEDES-MAYBACH S550 | 2017 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 20V047000 | 2020-01-28. ELECTRICAL SYSTEM:WIRING; POWER TRAIN:AUTOMATIC TRANSMISSION |
|---|
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| LI27.00-P-073124 | 2026-10-06. Service bulletin. Complaint Customer complaints relating to automatic transmission 725.0 (NAG3 Classic /9G‑TRONIC automatic transmission) and 725.1 (NAG3 facelift/9G‑TRONIC automatic transmission facelift) For faster, more effective and more targeted diagnosis, Intelligent Predictive Repair (IPR) has been developed and integrated into XENTRY Diagnosis. This ensures an automated diagnosis process. Cause As part of the on‑going quality monitoring process and associated quality and damaged part appraisals, a high number of ineffective repairs have been discovered. Such ineffective repairs have a negative impact on all those involved. For the customer, it means high costs and long repair times and for the dealer, it may result in the warranty claim being rejected. Remedy General note: IPR is available for: ‑ NAG3 Classic (automatic transmission 725.0) ‑ NAG3 Classic ‑ AMG sport model (AMG 43 and AMG 53 with converter, automatic transmission 725.0) ‑ NAG3 Classic ‑ Hybrid (automatic transmission 725.0) ‑ NAG3 Classic ‑ AMG 63 (automatic transmission 725.0) ‑ NAG3 MOPF ISG2 (automatic transmission 725.1) ‑ NAG3 MOPF Hybrid (automatic transmission 725.1) ‑ NAG3 MOPF AMG sport model (AMG 53/AMG 53e with ISG48V2 & converter /hybrid, automatic transmission 725.1) ‑ NAG3 MOPF AMG 43/63 with engine 139/177 (automatic transmission 725.1) Steps for the Service Advisor: Important: The more information and detail that can be given to the workshop about the complaint, then the more effective the subsequent diagnosis with IPR can be. To this end, a detailed service reception questionnaire has been provided to help the Service Advisor ask the right questions about the complaint. ‑ Ask precise details about the customer complaint and the conditions and context. ‑ Fill out the service reception questionnaire (please see WIS document: OF27.00‑P‑3000‑05A) for customer complaints in detail and forward it to the workshop. Operation steps for the workshop employee: 1. Perform quick test 2. Access the transmission control unit via XENTRY Diagnosis 3. Select "A customer complaint has been received" and carry out all subsequent operation steps (IPR diagnosis path). 4. The IPR repair instructions are displayed, Carry out the IPR repair instructions without performing any further diagnostic or repair steps. ‑ Important: The IPR repair instructions are binding and must be carried out. Differing repairs are possible; such repairs must be documented in XENTRY in free text. Please observe the information regarding the IPR diagnosis process in XENTRY. Conventional diagnosis and subsequent appropriate repairs are only permitted if IPR does not specify any repair instructions. Invoicing for the guided IPR steps: Operation item 27‑0640 and 0.1 hours Notice regarding warranty: The use of IPR in association with warranty claims is mandatory! If the IPR repair instructions are disregarded without justification, the warranty claims may be rejected and/or are subject to debit. IPR will provide a measure to repair the vehicle based on various data sources (EEPROM, fault codes, etc). Please consider the vehicle maintenance record of the vehicle. For warranty and goodwill repairs, the transmission ECU test log and/or IPR test result must be uploaded into Paperless XENTRY Diagnosis (pXD) . If repair is being determined based of oil pan condition pictures of oil pan MUST be provided to warranty as justification. ·Tamper‑proof documentation: The IPR repair instructions are stored in the control unit log. Please file this document in a tamperproof manner ‑ either in digital form or as a hard‑copy printout and also enclose a printout with the damaged part. In this regard, please comply with the country‑specific warranty requirements of the MPC/general distributor. |
|---|---|
| LI27.10-P-075869 | 2026-10-05. Service bulletin. 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 Return the vehicle to the client and request they drive the vehicle for at least 200 miles and return if the concern is not resolved. The extended drive will ensure the clutches are properly conditioned with the new oil and should resolve the concern. If this LI has already been applied to the vehicle, 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) ‑ Special Acquisition Data .txt file (Transfer Case Control Unit > Special Procedures > Procedures for support queries to market support > Special Data Acquisition) ‑ 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? |
| LI27.00-P-075630 | 2026-08-10. Service bulletin. Complaint This document is intended as a pre-case diagnostic reference for transmission related concerns. It will also ensure that if a case is necessary, all supporting documentation is available. This should not be used on its own as justification for creating a TIPS case. Cause The root cause will vary depending on the complaint. The goal of this document is to provide diagnostic checks and procedures that may help resolve customer complaints without opening a TIPS case. Remedy Before opening a transmission-related TIPS case, the following steps must be performed to ensure all relevant data has been collected and possible remedies (when applicable) have been performed. Please Note: At minimum, the documents below must be collected before proceeding to ensure the data in its original state when the vehicle arrived is captured. - Initial Quick Test w/ Freeze frame data - VGS Control Unit Log - Initial EEPROM data (.txt format) - IPR Result (if applicable. See LI27.00-P-073124 - Transmission diagnosis using the Intelligent Predictive Repair (IPR) tool) - Transmission Heath Page If the vehicle has previously been repaired for the same concern, note the date, mileage, and TIPS case or RO number, along with a brief description of the prior work performed. IPR Guidance: The IPR recommended repair should be completed prior to following any steps in this LI and prior to case creation. IPR repairs do not require additional warranty approvals or a TIPS case to validate/confirm the results. To ensure efficient case handling, please avoid opening TIPS cases for this reason. For further information regarding IPR please see the following documents: LI27.00-P-073124 - Transmission diagnosis using the Intelligent Predictive Repair (IPR) tool Oil Pan Condition Evaluation: In some situations, IPR will advise checking the oil pan condition and determining a repair based on the evaluation. Example photos in Xentry can be found in two ways: • Use the blue hyperlink in the IPR result, and it will take you to the Condition check of transmission oil • Navigate to Xentry Bluebook > Help for control unit > Condition check of transmission oil If a different repair that what is recommended by IPR is performed, attaching photo documentation of the complaint vehicle oil pan and the IPR example to the claim is required. Reproducing the Concern: Proper evaluation of transmission concerns generally requires the condition to be reproducible. It is recommended to compare the vehicle to a similar model, if available, to help determine whether the shift behavior is characteristic of the drivetrain or uncharacteristic for the vehicle. If the concern cannot be duplicated: • A test drive with the customer may assist in understanding and reproducing the complaint. • The vehicle shift quality should be compared to a known-good vehicle with identical drivetrain and model year. • Check Shift Quality History (VGS Control Unit > Adaptations > Shift Quality History) Shift Quality History will show the last 5 noticeable harsh shifts and some of the parameters in which it occurred. You can use this to attempt recreation of the operating conditions and increase likelihood of reproducing the complaint. Complaint A: Shift Quality Note: Certain AMG variants may exhibit more firm and noticeable shift behavior as a normal characteristic. Refer to LI27.60‑P‑075147 for additional information. 1. Perform Valve flushing procedure 2. Perform 5 Torque Converter adaptions in a row - Allow the vehicle to warm up naturally, DO NOT power brake as it will increase the temperature in the torque converter. - After the 5th adaptation, collect a screen shot showing all 5 on one page 3. Perform a standstill adaption - collect a screen shot Recheck vehicle operation. If the concern has not improved, driving adaptations should be performed to target specific gear shifts. |
| LI27.00-P-080840 | 2026-08-05. Service bulletin. Complaint Mercedes-Benz USA is currently experiencing limited availability of transmission fluid specification ATF 236.17 due to a global supply constraint. 236.17 ATF 1L and 5L (PNs: A002989060312 and A002989060313) bottles are out of stock or in limited supply at Zep. This LI has been created with the following intention: - Provide dealers with additional workshop-focused guidance regarding the current ATF 236.17 supply constraint and the planned introduction of ATF 236.18. - Supplement existing communications and address common workshop questions related to maintenance, repairs, and fluid applicability. - Provide technical clarification and practical workshop guidance during the temporary supply constraint period. Dealers should continue to reference the latest News Channel Updates (NCUs) for the most current information regarding availability, ordering processes, supply status, and other related updates. Cause Damage to the Shell production facility has resulted in 236.17 oil supply being reduced to 50% of normal output until the end of 2026. Remedy Please first check Latest NCU updates for latest detailed information. Please continue placing orders through Paragon as normal. Supply is expected to remain reduced and allocation measures are currently in place. We ask for your patience through this restricted supply period. Most orders will be filled in the order in which they were received, as supply is replenished. Those dealers with zero inventory, and pending orders, will receive priority. We expect supply to be stabilized in September 2026. Approved Fluids: Only use transmission fluid from the approved list found on the Mercedes-Benz Operating Fluids website. Non-approved fluid will result in mechanical damage to the transmission and must be avoided. https://operatingfluids.mercedes-benz.com/sheet/236.17 Approved fluids can be claimed as follows if there is no Mercedes-Benz part number: Part # ATFSUB1L - TRANSMISSION FLUID 1 LITER ATFSUB5L - TRANSMISSION FLUID 5 LITER Dealerships with Zero Inventory AND Grounded Vehicles: If a vehicle is currently grounded for repair at your dealer due to no 236.17 inventory, we may be able to expedite your order. Please open a StarSupport ticket including the following information: (Parts Related Inquiry>National Accounts>Zep) • LI document number • Short explanation of repair needed for grounded vehicle • Current days down of RO Maintenance and Service Interval Guidance Published maintenance intervals remain unchanged. Vehicles should continue to be maintained in accordance with the applicable maintenance schedule. This LI does not revise or extend any published maintenance interval requirements. If all required parts and materials are not available prior to scheduling or beginning a transmission service, dealers should consider postponing routine preventative transmission maintenance until the necessary parts become available. For vehicles that have not yet reached the applicable maintenance interval and do not exhibit transmission-related concerns, there is no need to recommend preventative transmission services prior to the scheduled maintenance interval. When evaluating whether routine transmission maintenance can be deferred until parts become available, dealers should consider: • Overall vehicle condition • Vehicle usage and operating conditions • Presence of transmission-related symptoms or customer complaints • Customer expectations and vehicle operating requirements • Availability of required parts and materials Introduction of New Fluid Specification 236.18 Mercedes-Benz is currently preparing the introduction of ATF 236.18 as an additional approved transmission fluid solution for applicable NAG3 transmissions. At the time of publication of this LI, ATF 236.18 is not yet available for dealer ordering or workshop use in the U.S. market. See attachment for further details. |
| LI35.30-P-058566 | 2026-07-14. Service bulletin. Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once in each instance when changing direction of travel. 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 cracking of the microweld 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. See also LI33.20-P-078406 Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove side shafts 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") with Molykote and leave to dry for "one hour" in removed condition 4. Reinstall side shafts Note: Before using the antifriction coating (Molykote), stir it or shake it thoroughly for (at least 1 minute). |
| PSL-NCU Return Parts 5/22 | 2026-06-01. Other. Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than Thursday, June 11, 2026. After June 11th, returns of these parts will no longer be accepted. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. All returned parts will be replaced in accordance with the chart provided below. |
| PSL-NCU Return Parts 5/15 | 2026-05-18. Other. The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than Thursday, June 4, 2026. After June 4th, returns of these parts will no longer be accepted. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. All returned parts will be replaced in accordance with the chart provided below. |
| LI27.60-P-080449 | 2026-04-14. Service bulletin. Complaint Harsh upshifts, downshifts, or jolting in lower gears when accelerating. Cause Incorrectly installed (rotated) rotational speed sensors on the EHS (VGS Control Unit) can cause abnormalities in signals. As a result, poor adaptation values are stored and harsh gearshifts are felt. This only affects vehicles with VGS control units produced between days 182-296 of 2025 (July 4, 2025-October 23, 2025). Remedy 1. Collect initial transmission EEPROM file 2. Check EEPROM .txt file for VGS control unit serial number and production date (attachment figure 1) - If the valve body is already removed, you can inspect the control unit for its stamped serial number (attachment figure 2) If the production date is or is within 25182-25296 (07/4/25-10/23/25): The complete valve body will require replacement. 1. Remove transmission oil pan & inspect fluid/pan/filter condition - compare findings to extended fluid condition examples provided in Xentry blue book under general information for VGS 2. Replace complete EHS valve body, fill to near max fluid level, & complete initial start-up - Ensure all oil guide pipes are installed in the new valve body to prevent a new concern after replacement. (See photos in WIS instructions) - Verify the new valve body production date is outside of day 182-296 of 2025 (attachment figure 2) If the production date is outside of this range: This LI is not applicable. 1. Perform IPR and follow recommended instruction |
| NCU - 2025120009 | 2026-03-14. Service campaign. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the drivetrain control unit does not meet current production specifications. The system may experience an excessively high quiescent current draw on the vehicle, which could lead to an increased discharge of the 12V battery. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the drivetrain control unit software. |
| LI27.19-P-080219 | 2026-02-17. Service bulletin. Complaint Check engine light on with the following fault is current in the VGS Control Unit: P084300 Oil pressure sensor 'A' has a short circuit to positive stored in VGS control unit. Cause Electrical failure of oil pressure sensor integrated into VGS Control Unit Remedy Intelligent Predictive Repair (IPR) recognizes this fault pattern and will provide the necessary repair suggestion. 1. Perform IPR and follow the recommended procedures 2. Replace complete EHS valve body, fill to near max fluid level, & complete initial start-up - Ensure all oil guide pipes are installed in the new valve body to prevent a new concern after replacement. |