Mercedes-Benz AMG C43 2022–2025 — technical service bulletin

Bulletin LI54.21-P-079510 · NHTSA communication 11020873 · issued Jul 17, 2025

Technical service bulletin

communication type

Electrical System

component

2022–2025

model years

vehicle entries

Official summary

Complaint Diverse functional limitations in the vehicle in combination with various warning and fault messages in the instrument cluster display. Cause Communication timeouts mean that communication errors may occur in the on-board electrical system, which can result in various fault messages being displayed in the instrument cluster. This could be down to delayed feedback from the drivetrain control unit (N127) (CPC) to other control units networked to the CAN bus. Information: • It may not be possible to attribute any communication errors stored in the control units on the CAN bus to a speci

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.