MERCEDES-BENZ, MERCEDES-MAYBACH
LI91.29-P-080554
Manufacturer communications
- Publication date
- 2026-05-15
- Received by NHTSA
- 2026-05-15
- NHTSA record numbers
- 11032704
Manufacturer summary
Original wording in English
Complaint One or more seat functions are restricted or inoperative. This may include:
• Seat memory
• Automatic seat adjustment
• Easy Entry/Exit
• Head restraint presetting
• Collision avoidance with bench seat at rear
• Actuation by other vehicle systems Seat normalization is missing, and fault code B228678 – “The control unit calibration has been lost or was not performed. Adaptation or adjustment is not correct.” is stored in the seat control unit. Additional fault codes may also be present. Cause The condition is currently under investigation. Remedy Process any additional faults first.
• If a clear cause is found (for example, a failed component, wiring issue, or connector concern), repair that issue as required. If no root cause can be determined:
• Do NOT perform Initial Start-up, Software Update, or Normalization of the Control Unit
• Create a control unit log for the affected seat control unit.
• Open a TIPS case to the Body/Chassis/Entertainment inboxand attach the control unit log for further analysis.
• Seat memory
• Automatic seat adjustment
• Easy Entry/Exit
• Head restraint presetting
• Collision avoidance with bench seat at rear
• Actuation by other vehicle systems Seat normalization is missing, and fault code B228678 – “The control unit calibration has been lost or was not performed. Adaptation or adjustment is not correct.” is stored in the seat control unit. Additional fault codes may also be present. Cause The condition is currently under investigation. Remedy Process any additional faults first.
• If a clear cause is found (for example, a failed component, wiring issue, or connector concern), repair that issue as required. If no root cause can be determined:
• Do NOT perform Initial Start-up, Software Update, or Normalization of the Control Unit
• Create a control unit log for the affected seat control unit.
• Open a TIPS case to the Body/Chassis/Entertainment inboxand attach the control unit log for further analysis.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Mercedes-Benz
B228678“The control unit calibration has been lost or was not performedMercedes-Maybach
B228678“The control unit calibration has been lost or was not performedCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mercedes-Benz | E 350 4MATIC | 2026 |
| Mercedes-Benz | E 350 4MATIC | 2025 |
| Mercedes-Benz | E 350 4MATIC | 2024 |
| Mercedes-Benz | E 450 | 2024 |
| Mercedes-Benz | E 450 4MATIC | 2026 |
| Mercedes-Benz | E 450 4MATIC | 2025 |
| Mercedes-Benz | E 450 4MATIC | 2024 |
| Mercedes-Benz | E 450 4MATIC ALL-TERRAIN | 2026 |
| Mercedes-Benz | E 450 4MATIC ALL-TERRAIN | 2025 |
| Mercedes-Benz | E 450 4MATIC ALL-TERRAIN | 2024 |
| Mercedes-Benz | E 53 4MATIC+ | 2026 |
| Mercedes-Benz | E53 E 4MATIC+ | 2025 |
| Mercedes-Benz | E53 E 4MATIC+ ALL-TERRAIN | 2026 |
| Mercedes-Benz | GLC 300 | 2026 |
| Mercedes-Benz | GLC 300 | 2025 |
| Mercedes-Benz | GLC 300 | 2024 |
| Mercedes-Benz | GLC 300 | 2023 |
| Mercedes-Benz | GLC 300 4MATIC | 2026 |
| Mercedes-Benz | GLC 300 4MATIC | 2025 |
| Mercedes-Benz | GLC 300 4MATIC | 2024 |
| Mercedes-Benz | GLC 300 4MATIC | 2023 |
| Mercedes-Benz | GLC 300 4MATIC COUPE | 2026 |
| Mercedes-Benz | GLC 300 4MATIC COUPE | 2025 |
| Mercedes-Benz | GLC 300 4MATIC COUPE | 2024 |
| Mercedes-Benz | GLC 300 COUPE | 2024 |
| Mercedes-Benz | GLC 300E | 2025 |
| Mercedes-Benz | GLC 350 E 4MATIC | 2026 |
| Mercedes-Benz | GLC 350 E 4MATIC | 2025 |
| Mercedes-Benz | GLC43 4MATIC COUPE | 2026 |
| Mercedes-Benz | S 500 | 2023 |