# Service bulletin LI01.00\-P\-078172

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: 11027596
- Published by NHTSA: 2026\-01\-13
- Manufacturer's number: LI01.00\-P\-078172
- Manufacturer's date: 2026\-01\-12
- NHTSA component: ENGINE

## NHTSA's summary

Complaint Dull thumping noise or ticking noise under the vehicle in the area of the engine/two\-mass flywheel/transmission. Is significantly perceptible at the front right wheel well and can also be faintly heard in the vehicle interior. Cause The ticking noise occurs in idle operation in drive program C \& S at 780 rpm when the state of charge of the battery is over 65% and the load requirement at the belt\-driven starter alternator is simultaneously over 25 Nm. The load requirement can occur due to a number of auxiliary consumers \(e.g. air conditioning system, steering wheel or seat heating, etc.\). Remedy Check the software version on N127 \(PTCU\) and N15/15 \(transmission\) and update if an update is available. Software change: Adaptation of the idle speed and thereby reduction of the intensity of the noise. If the problem persists, the cause is design\-related and therefore corresponds to the series production configuration. Replacing parts does not remedy the problem. Note: The noise is not caused by damage or a defect. It also has no negative effects over the operating time.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027596-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027596-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ AMG C43
- 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC
- 2024 MERCEDES\-BENZ AMG GLC43
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE
- 2023 to 2026 MERCEDES\-BENZ AMG SL43
- 2026 MERCEDES\-BENZ GLC43 4MATIC COUPE

JSON: [/v1/bulletins/11027596](/v1/bulletins/11027596)

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