Service campaign NCU - 2025040003

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.

NHTSA's summary

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the engine control unit software does not correspond to current production specifications. The diagnosis routine for the pressure sensor in the crankcase ventilation system may be populated with incorrect data. As a consequence, the check engine light may illuminate after the engine is switched off even though there is no functional impairment. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the engine control unit software.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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