Chassis
generic / SAE
P25C7
Brake Booster Temperature Sensor A Circuit High
The booster temperature signal is above the upper diagnostic threshold. Common causes are an open sensor or a short to a 5 V reference in the harness.
SystemChassis
Typegeneric / SAE
GroupP2
Range / number5 / C7
Possible causes
- Open sensor element high
- Sensor signal wire shorted to the 5 V reference medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–3.5 h
- Component: electric brake booster
- Component: temperature sensor
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012