Service bulletin LI54.71-P-078802
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 | 11016159 |
| Published by NHTSA | 2025-04-01 |
| Manufacturer's number | LI54.71-P-078802 |
| Manufacturer's date | 2025-03-28 |
| NHTSA component | ELECTRICAL SYSTEM |
NHTSA's summary
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.
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
Electrical system
| MERCEDES-BENZ AMG CLA45 | 2024 |
|---|---|
| MERCEDES-BENZ AMG GLC43 | 2016 to 2024 |
| MERCEDES-BENZ AMG GLC63 | 2018 to 2022 |
| MERCEDES-BENZ AMG GLC63 S | 2020 to 2023 |
| MERCEDES-BENZ AMG GLC63 S E | 2024 to 2025 |
| MERCEDES-BENZ AMG GLC63 S E 4MATIC+ COUPE | 2025 |
| MERCEDES-BENZ AMG GLC63S | 2018 to 2019 |
| MERCEDES-BENZ AMG GLE53 | 2021 to 2022 |
| MERCEDES-BENZ AMG GLE53 4MATIC+ | 2023 to 2024 |
| MERCEDES-BENZ AMG GT43 | 2020, 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 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT53E | 2024 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 | 2019, 2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S | 2022, 2023 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63 S E | 2025 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ AMG GT63S | 2019, 2020, 2021 (the catalog's model; the bulletin names a series or trim of it) |
| MERCEDES-BENZ E 400 | 2018 |
| MERCEDES-BENZ E 450 | 2019 to 2020 |
| MERCEDES-BENZ EQB 250 | 2022 to 2024 |
| MERCEDES-BENZ EQB 250+ | 2023 to 2025 |
| MERCEDES-BENZ EQB 300 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ EQB 350 4MATIC | 2022 to 2025 |
| MERCEDES-BENZ EQC 400 | 2020 |
| MERCEDES-BENZ EQC 400 E | 2021 |
| MERCEDES-BENZ GLA 250 | 2021 to 2025 |
| MERCEDES-BENZ GLB 250 | 2020 to 2025 |
| MERCEDES-BENZ GLC 300 | 2018 to 2025 |
| MERCEDES-BENZ GLC 300 COUPE | 2024 |
| MERCEDES-BENZ GLC 300E | 2025 |
| MERCEDES-BENZ GLC 350 | 2018 to 2020 |
| MERCEDES-BENZ GLC 350 E | 2018 |
| MERCEDES-BENZ GLC 350 E | 2020 to 2021 |
| MERCEDES-BENZ GLC 350 E 4MATIC | 2025 |
| MERCEDES-BENZ GLC300 | 2016 to 2017 |
| MERCEDES-BENZ GLC350E | 2019 |
| MERCEDES-BENZ GLE 450 | 2020 to 2024 |
| MERCEDES-BENZ GLS 450 | 2020 |
| MERCEDES-BENZ GLS 450 4MATIC | 2022 to 2024 |
| MERCEDES-BENZ GLS450 | 2021 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 25V129000 | 2025-02-28. ELECTRICAL SYSTEM:PROPULSION SYSTEM |
|---|---|
| 2024615 | 2024-10-18. Electrical |
| 24V445000 | 2024-06-14. ELECTRICAL SYSTEM:WIRING |
| 2024105 | 2024-02-16. Electrical |
| 2024081 | 2024-02-09. Electrical |
| 24V100000 | 2024-02-09. ELECTRICAL SYSTEM:WIRING |
| 23V574000 | 2023-08-11. ELECTRICAL SYSTEM:ADAS:BLINDSPOT:SENSORS |
| 2022397 | 2022-07-22. Electrical |
| 22V533000 | 2022-07-22. ELECTRICAL SYSTEM:WIRING |
| 22V365000 | 2022-05-20. COMMUNICATION: AUTO CRASH NOTIFICATION; ELECTRICAL SYSTEM:SOFTWARE |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| OTA-Comm. Mod. SW. Update | 2026-10-06. Over-the-air update. A software update will be performed that provides enhancements to the robustness and system stability of the communication module. The update is free of charge and runs in the background, which takes about 8 minutes to install. During this time, the vehicle can be driven without any restrictions, and the new software will be active with the next ignition cycle. Remedy 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. |
|---|---|
| LI54.71-P-079104 | 2026-10-02. Service bulletin. Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("‑ ‑"). • Flashing when current vehicle speed is under speed limit. • Flashing between US speed limit symbol and European speed limit symbol. NOTE: • Verify that the concern falls under one of the attachment videos. If not, then it is outside of the scope of this LI. • This also does not cover "Traffic Sign Inoperative" messages on the instrument cluster. Cause There are two identified reasons for this concern: 1. Country code information stored incorrectly at a particular geographic latitude range. 2. Incorrect reference data when the vehicle is started and a GPS signal is not immediately available. Remedy Update head unit software to latest version and the re‑check function in the same location. NOTE: Updated head unit software for AMG's has NOT been released yet. ETA 12/2026. If vehicle is still exhibiting one of the symptoms as described exactly as in the complaint section or as shown in the video attachments, open a TIPS case to the Body/Chassis/Entertainment inbox with the following: • Video of the concern. • Exact location (latitude and longitude is best) |
| LI54.21-P-080326 | 2026-10-02. Service bulletin. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2‑ 3 key cycles. The vehicle can be released back to the customer. |
| LI54.71-P-079104 | 2026-09-02. Service bulletin. Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("‑ ‑"). • Flashing when current vehicle speed is under speed limit. • Flashing between US speed limit symbol and European speed limit symbol. NOTE: • Verify that the concern falls under one of the attachment videos. If not, then it is outside of the scope of this LI. • This also does not cover "Traffic Sign Inoperative" messages on the instrument cluster. Cause There are two identified reasons for this concern: 1. Country code information stored incorrectly at a particular geographic latitude range. 2. Incorrect reference data when the vehicle is started and a GPS signal is not immediately available. Remedy Update head unit software to latest version and the re‑check function in the same location. If vehicle is still exhibiting one of the symptoms as described exactly as in the complaint section or as shown in the video attachments, open a TIPS case to the Body/Chassis/Entertainment inbox with the following: • Video of the concern. • Exact location (latitude and longitude is best) |
| LI54.10-P-080880 | 2026-08-14. Service bulletin. Complaint Customer Complaint: - AC charging is not possible. - The departure time, charging pause, location-based charging or target SOC limit is automatically set to 50% or to a random value in the Mercedes me application or in the charging settings on the head unit display. (Picture 1 & 3) - Incorrect notifications appear in the Mercedes me application for charging-related functions. (Picture 2) Related DTCs in quick test: No related fault codes (DTCs) are stored in the relevant control units. CPC3 - N127 (Drivetrain control unit) OBL223_GEN4 - N83/11 (Alternating current charger for high-voltage battery) DCB223 - N116/5 - Direct current charge connection unit (DCCU) Picture1 The target SOC limit is automatically set to 50% or any random values during charging. Picture 2 Incorrect notification Example “Unable to unlock charging cable. Picture 3 Incorrect settings of charge interruption or pause. (If applicable) Cause - The Customer shares their Mercedes me credentials (password) with a third-party application, for example, a wall box application. This causes the Mercedes Benz backend server to receive random requests to reset the maximum SOC, departure time, charging pause, etc. - Charging settings are set incorrectly, for example, incorrect departure time, charging program, charging interruption/ pause, etc. Remedy The remedies below may vary depending on the customer complaint. Refer to the remedy that best matches the customer complaint. Remedy 1: The target SOC limit is automatically set to 50% or to random values during charging. - Change the Mercedes me login password on the Mercedes me homepage. (My Account > Login and Security > Reset). (Refer to Annex 1). Previously granted authorizations should then be revoked so that the charging settings can no longer be changed by external applications. Advise customers not to share the new password again. - Are there any sub-users? If yes, revoke their rights and reassess the function. -If differences between the vehicle and the Mercedes me app are visible, a new synchronization is recommended. Turn off Digital Extras through the Mercedes me app or the MMCR portal, and then turn the services on again. Remedy 2: Incorrect notifications in the Mercedes me app for charging-related functions. - Restart synchronization between the app and backend. Turn off Digital Extras through the Mercedes me app or the MMCR portal, and then turn the services on again. (Refer to Annex 2) Remedy 3: Incorrect charge interruption or pause setting. - Perform a factory reset of the head unit (A26/17). (Home > Functions > System > Reset), or turn off/correct all charging settings. (Refer to Annex 3) Additional Information: (Good to know) The LED on the charging inlet or socket indicates whether charging is completed or paused. 1) If the target SOC is reached, the charging inlet LED lights up Blue/Green without flashing. 2) If charging is paused, the charging inlet LED lights up orange without flashing. Additionally, the head unit charging settings display a charging pause. Note: Do not replace any hardware components for these complaints. If the complaint cannot be solved, please contact via TIPS or CAC. |
| LI54.65-P-080132 | 2026-08-12. Service bulletin. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics. Cause Various root causes Remedy See attached diagnostic guide. |
| LI82.60-P-080806 | 2026-08-11. Service bulletin. Complaint DAB, FM, or SDARS radio reception is limited, only a few stations are found. Cause The firmware installation was incomplete. Remedy In the A26/17 control unit "MBUX multimedia system" (head unit), use XENTRY to carry out the special process "All Modules"; this will reinstall the firmware completely. |
| LI82.60-P-080806 | 2026-07-27. Service bulletin. Complaint After an "Over the Air" update (OTA), FM or SDARS radio reception is limited; only a few stations are found. Cause The firmware installation was incomplete. Remedy In the A26/17 control unit "MBUX multimedia system" (head unit), use XENTRY to carry out the special process "All Modules"; this will reinstall the firmware completely. |
| LI54.21-P-080326 | 2026-07-24. Service bulletin. Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer. |
| LI46.10-P-078012 | 2026-07-21. Service bulletin. Complaint Hand detection system – malfunction / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" "Active steering assist not available" Cause Possible causes: Hand detection mat, hand detection control unit, contacts, and electrical feed line. 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 Check: Please do not replace the HOSWD control unit. Please flash the new SW and perform the SCN coding for the HOSWD control unit (N179/1) (available from July 2026). The software can be flashed onto all HOSWD213 with HW number A0009011522 and all HOSWD223 with HW number A0009011422. Please also flash the SW for the IDC control unit (N62/4), if possible (only applies to HOSWD223). Erase fault memory Remedy: Turn on the ignition or start the engine without touching the steering wheel. If, after 10 seconds without touching the steering wheel, one of the three fault messages appears on the instrument cluster: Check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, crimp connections, loose connections, etc. (example in picture 2 and 3). If there is visible damage -> replace the steering wheel electronics or the feed lines. If there is not any visible damage -> replace the steering wheel rim. If a yellow message does not appear on the instrument cluster within 10 seconds: Grasp the steering wheel fully with both hands, including the chrome molding at the 6 o'clock position (see picture 1). If the fault is triggered by grasping the steering wheel rim or pressing the clip at the 6 o'clock position, check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, kinked connections, loose connections, etc. (example in picture 2 and 3). Check the ground connections (screw connections and cables to the steering wheel rim); if necessary, retighten the screws/bolts and check for corrosion (picture 4). If there is visible damage -> replace the steering wheel electronics or the feed lines. If there is not any visible damage: Replace the steering wheel rim. Please do not replace the HOSWD control unit. A TIPS case should be created if fault profile is unclear. In the event of a customer complaint and a further fault code in HOSWD: B1E7713: Check the ground connections (screw connections and cables to the steering wheel rim); if necessary, retighten the screws/bolts and check for corrosion (picture 4). B1F1F04: Check the control unit of the hand detection system; if necessary, replace this with the control unit from a donor vehicle (make sure that the hardware part numbers are identical). |