# Service bulletin LI07.70\-P\-078547

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11026829
- Published by NHTSA: 2025\-12\-24
- Manufacturer's number: LI07.70\-P\-078547
- Manufacturer's date: 2025\-12\-18
- NHTSA component: ENGINE

## NHTSA's 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 Update software of powertrain control unit N127. New software version: MY 2022\- A2549021611 MY 2023\- A2549023610

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026829-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11026829-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2022 to 2023 MERCEDES\-BENZ C 300
- 2022 to 2023 MERCEDES\-BENZ C 300 4MATIC

JSON: [/v1/bulletins/11026829](/v1/bulletins/11026829)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20LI07.70-P-078547&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11026829&vehicle=Service%20bulletin%20LI07.70-P-078547)