P25C7Brake Booster Temperature Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P25C7 flags a sensor A signal that is too high; GM interprets it as the temperature line shorted to supply. In the EBCM part of table 23OBDG07 for the 2023 Corvette Z06 the voltage must exceed 3.27 V five consecutive times within 0.6 s with the ignition on, and the fault is Type B with two trips to the MIL. Tables 24OBDG07 and 25OBDG03A repeat these values. Beyond a real short, an open sensor or a broken ground can also pull the signal toward the top of the range on many sensor designs, so the wiring at the booster deserves a check before the unit is replaced. Its second sensor uses the slightly lower limit of 3.14 V and the chassis code C057A. P25C6 is the low-side counterpart.
- What you may notice
- Check engine lamp after two trips
- Brake system warning message
- Reduced brake assistance possible
- Likely causes
- LikelySensor signal shorted to the supply line
- PossibleOpen sensor circuit or missing sensor ground
- PossibleTemperature sensor open internally
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.