OBD-II code · Powertrain (generic, extended)
P25C5 Brake Booster Temperature Sensor A Circuit Range/Performance
The booster temperature sensor reading is implausible relative to commanded assist or coolant temperature. The signal moves too slowly, sticks, or never reaches expected values during operation.
Is it safe to drive with P25C5?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- PossibleSensor drift or contamination on the temperature element
- PossibleSensor not seated properly against the booster motor housing
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Electric Brake Booster, Temperature Sensor
Related codes
- C057CBrake Booster Temperature Sensor B Circuit Range/Performance
- C05B6Brake Booster Temperature Sensor C Circuit Range/Performance
- P25C2Alternative Fuel Disable Signal Circuit High
- P25C3Alternative Fuel Disable Signal Circuit Low
- P25C4Brake Booster Temperature Sensor A Circuit
- P25C6Brake Booster Temperature Sensor A Circuit Low
- P25C7Brake Booster Temperature Sensor A Circuit High
- P25C8Brake Booster Temperature Sensor A Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.