Code Definition

C025E — Brake Booster Vacuum Sensor Circuit

System: Chassis  |  Type: Generic (OBD-II Standard)  |  Make: Holden

About C025E

C025E is a generic (obd-ii standard) chassis diagnostic trouble code recorded for Holden vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C025E is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

Because C025E is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Electronic Brake Control Module (EBCM) or Body Control Module monitors the brake booster vacuum sensor signal to assess the vacuum available for power brake assistance. DTC C025E is set when the module detects an implausible vacuum sensor signal, loss of signal, or a circuit fault such as an open circuit, short to ground, or short to battery for a calibrated period. The sensor is a three wire device fed a 5V reference and ground by the module, returning a voltage that varies with the vacuum present in the booster or its supply line. When this code is set the system may command the auxiliar...

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