Mercedes-Benz AMG CLA35 2020–2026 — service campaign

Bulletin NCU - 2025100004 · NHTSA communication 11024810 · issued Oct 31, 2025

Service campaign

communication type

Electrical System

component

2020–2026

model years

vehicle entries

Official summary

Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the 48-V on-board electrical system battery software might not meet current production specifications. A communication error may occur when reactivating the 48V lithium-ion battery during reinitialization. The system might detect and store this error, causing the malfunction indicator lamp to illuminate unnecessarily. Remedy MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update 48-V onboard electrical system battery software.

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.