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RecallGazette

Vehicle problems, recalls & safety intelligence

Mercedes-Benz AMG CLA35 2020–2025 — technical service bulletin

Bulletin LI54.21-P-078926 · NHTSA communication 11016046 · issued Mar 26, 2025

Technical service bulletin
communication type
Engine
component
2020–2025
model years
30
vehicle entries

Official summary

Complaint Check engine light comes on when driving/starting the vehicle. No drivability concerns. Cause SW conflict of the 48V battery Remedy 1.-Check for SW in the 48V battery. 1. If SW is available, update the 48V battery. 2. Clear all faults and perform a few drive cycles. 3. If no faults return, the vehicle can be released. 2.-If no SW available, perform the following: - Charge the batteries (<5A charging current) - Erase the fault codes - Access the 12V battery contacts - Ignition off and bus sleep for 10 minutes - Disconnect the 12V battery - Wait 10 minutes - Disconnect Connector 3 at t

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.