What are the common causes of P25C5?

A brake booster temperature sensor A that drifted out of calibration. A worn sensing element in sensor A. Contamination at sensor A from carbon or oil. A loose sensor A connector.

Inspect the sensor A connector for contamination. Monitor the sensor A signal through a full warm up. Check for oil or coolant at the booster. Confirm the correct sensor A part. Replace the brake booster temperature sensor A if the reading drifts. Clear the code and retest.

P25C5

Brake Booster Temperature Sensor A Circuit Range/Performance

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P25C5 means Brake Booster Temperature Sensor A Circuit Range/Performance.

Where it lives

For P25C5, start at the sensor the description names.

Check these first

A brake booster temperature sensor A that drifted out of calibration
A worn sensing element in sensor A
Contamination at sensor A from carbon or oil
A loose sensor A connector

What to do next

Inspect the sensor A connector for contamination
Monitor the sensor A signal through a full warm up
Check for oil or coolant at the booster
Confirm the correct sensor A part
Replace the brake booster temperature sensor A if the reading drifts
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.