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May 15, 2026 Service bulletin

Complaint One or more seat functions are restricted or inoperative

Mercedes-Benz technical service bulletin LI91.29-P-080554 for 2022-2026 Mercedes-Benz C300, 2024-2026 Mercedes-Benz E350 and 2023-2026 Mercedes-Benz GLC 300 and others.

Bulletin number
LI91.29-P-080554
Component
Seats
Summary
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.

Owners of these vehicles have filed 5 complaints in the seats category.

Vehicles covered

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