P25C8Brake Booster Temperature Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P25C8 is meant for a sensor A signal that drops out briefly or jumps faster than any real temperature in the booster could change, the typical footprint of a loose pin, a cracked solder joint or a wire that breaks under vibration. Each event may be too short for the low or high check to confirm, which is why this separate code exists. No manufacturer documents P25C8 publicly. GM's 2023 Corvette tables only confirm hard faults, requiring five consecutive out-of-range readings within 0.6 s for P25C6 or P25C7, so a fault that comes and goes might remain hidden there. Because an electromechanical booster such as Bosch's iBooster can also build brake pressure on its own for assistance systems, a jittery temperature input may make the unit limit its motor torque at unexpected moments.
- What you may notice
- Brake warning that appears and disappears
- Occasional change in pedal feel
- Likely causes
- LikelyLoose or spread terminal in the booster connector
- PossibleWire breaking intermittently under vibration
- RareCracked solder joint inside the booster electronics
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.