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August 10, 2026 Service bulletin

During cold starting, a tortoise symbol may be displayed in the event of reduced engine output

Mercedes-Benz technical service bulletin LI54.30-P-078529 for 2022-2026 Mercedes-Benz C300, 2023-2024 Mercedes-Benz AMG C43 and 2022-2026 Mercedes-Benz C 300 4matic and others.

Bulletin number
LI54.30-P-078529
Component
Electrical system
Summary
Complaint During cold starting, a tortoise symbol may be displayed in the event of reduced engine output. For "non-hybrid vehicles", the thermostat symbol must be displayed. Cause Coding N133/1 IC Instrument cluster Remedy Perform N133/1 IC-Instrument-Cluster manual coding.

Owners of these vehicles have filed 20 complaints in the electrical category.

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