PowertrainP25B892

Serious

Severity: Serious - have it checked soon

The actuation of the vacuum pump of the brake system has a malfunction. Performance or Incorrect Operation

1 brand affected · Description from Mercedes-Benz data.

Key terms: Boost pressure: extra air pressure made by a turbo or supercharger · Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

Safety: This code relates to the braking system or brake assist. Braking may be affected.

1What it means in plain English

The brake system vacuum pump is not operating correctly, so brake assistance may be reduced.

2Common causes

Faulty vacuum pump or its control circuit
Damaged wiring or connector
Leaking vacuum hose or booster
Faulty vacuum sensor
Control module fault

3Can I drive?

Serious · drive with care

Brakes may be affected. Have it checked immediately; if the pedal feels hard or stopping distances increase, stop safely and have the car recovered.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 1

Brand	Code	Description	System
Mercedes-Benz	P25B892	The actuation of the vacuum pump of the brake system has a malfunction. Performance or Incorrect Operation Brand	Powertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

Browse Pxxx codes or P25Bxx codes.