# Service campaign NCU \- 2026080001

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 campaign
- NHTSA id: 11037099
- Published by NHTSA: 2026\-09\-05
- Manufacturer's number: NCU \- 2026080001
- Manufacturer's date: 2026\-08\-15
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Issue Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has determined that on certain Model Year 2027 S\-Class \(223 platform\) vehicles, the software for the 12 V on\-board electrical system safety disconnect switch control unit does not correspond to the current series configuration. It is possible that during a workshop visit, the use of an undersized charger could result in undervoltage. If the vehicle detects undervoltage three times in succession, the safety disconnect switch will be permanently locked and prevents the vehicle from starting. Remedy MBUSA will conduct a service campaign. An authorized Mercedes\-Benz dealer will update the software of the Safety Disconnect Switch for the 12 V On\-board electrical system.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037099-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037099-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2027 MERCEDES\-BENZ S 580 4MATIC

JSON: [/v1/bulletins/11037099](/v1/bulletins/11037099)

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