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

Bulletin LI00.20-P-078424 · NHTSA communication 11033935 · issued Jun 12, 2026

Technical service bulletin

communication type

Electrical System

component

2021–2026

model years

vehicle entries

Official summary

Complaint The remaining time shown on the instrument cluster in the workshop menu (days to next due service) is implausible (>365 days) for the following conditions: • for the date of the vehicle handover • or the last conducted and confirmed Service A/B Cause Case 1: Observe the following on vehicles with a disconnected on-board electrical system battery (12V/48V): • The period in which the on-board electrical system battery is disconnected cannot be counted by the maintenance computer. • As soon as the on-board electrical system battery is connected again, the maintenance computer automatica

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.