# Service bulletin LI15.40\-P\-078041

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: 11005340
- Published by NHTSA: 2024\-07\-30
- Manufacturer's number: LI15.40\-P\-078041
- Manufacturer's date: 2024\-07\-15
- NHTSA component: POWER TRAIN

## NHTSA's summary

Complaint Whistling and/or howling noises in the area of the engine compartment when idling at low rpm. Cause The high\-voltage belt\-driven starter alternator \(HV\-BSA\) charges the high\-voltage battery whenever its state of charge \(SOC\) is less than 20% and the speed is lower than 15 km/h. The displayed SOC refers to the value shown in the display \(AMG Dynamics\). When auxiliary consumers such as the air conditioning system are activated and the on\-board electrical system load increases, the idling speed is not sufficient for the HV\-BSA to provide enough current to the high\-voltage battery. As a consequence, the idle speed is increased in stages. The noises may vary in intensity and frequency depending on the idle speed and load. This causes the noises mentioned above. Remedy Replacing the HV\-BSA will not remedy the issue. Charge the high\-voltage battery to 100% SOC before handing it over to the customer.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005340-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11005340-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2024 MERCEDES\-BENZ AMG C63 S E
- 2023 MERCEDES\-BENZ S 580 E
- 2024 MERCEDES\-BENZ S 580 E 4MATIC

JSON: [/v1/bulletins/11005340](/v1/bulletins/11005340)

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