OBD-II code · Powertrain (generic, extended)
P25C6 Brake Booster Temperature Sensor A Circuit Low
The booster temperature signal is below the lower diagnostic threshold. Typical causes are a shorted sensor element or a short to ground in the harness.
Is it safe to drive with P25C6?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInternal short in the sensor element
- PossibleSensor signal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
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, Wiring Harness
Related codes
- C0579Brake Booster Temperature Sensor B Circuit Low
- C05B3Brake Booster Temperature Sensor C Circuit Low
- P25C3Alternative Fuel Disable Signal Circuit Low
- P25C4Brake Booster Temperature Sensor A Circuit
- P25C5Brake Booster Temperature Sensor A Circuit Range/Performance
- P25C7Brake Booster Temperature Sensor A Circuit High
- P25C8Brake Booster Temperature Sensor A Circuit Intermittent/Erratic
- P25C9Brake System Control Module B Requested MIL Illumination
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.