Mercedes-Benz C 300 2022–2025 — technical service bulletin
Bulletin LI07.70-P-078547 · NHTSA communication 11014399 · issued Feb 19, 2025
Technical service bulletin
communication type
Engine
component
2022–2025
model years
9
vehicle entries
Official summary
Complaint Engine idle fluctuates or stumbles at approximately 7 second interval. No relevant fault codes are stored. If fault codes are stored or check engine light illuminated, this should be diagnosed separately. Cause Torque signal mismatch between MRG and PTCU control units. Only effects version 20B of PTCU. Remedy Software solution in development and LI will be updated once an ETA is available. Replacing parts will not resolve this symptom. Vehicle can be released to owner if there are no other symptoms present. The idle fluctuation typically resolves after several trips and will not caus
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.