Mercedes-Benz AMG C43 2021–2026 — technical service bulletin

Bulletin LI82.00-P-080029 · NHTSA communication 11029961 · issued Mar 9, 2026

Technical service bulletin

communication type

Seats

component

2021–2026

model years

vehicle entries

Official summary

Complaint The seat may no longer be adjustable using the electric seat adjustment switch on the door module. No related error is stored in the quick test. Cause Under certain conditions, the electric seat adjustment switch may remain in sleep mode. It is then not possible to adjust the seat using this switch. This is a software error. Remedy To restore functionality, perform the following steps: 1. Remove the door trim from the affected door. 2. Unplug and reconnect the plug of the electric seat adjustment switch (No. 2 in the picture in work instruction AR91.29-P-2522WT) to perform a reset of

Vehicles covered

What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.