P25C6Brake Booster Temperature Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P25C6 means the signal of brake booster temperature sensor A is too low, which GM describes as the sensor line being shorted to ground. GM uses the code on the 2023 Corvette Z06 (table 23OBDG07, EBCM section) and keeps the same logic in its 2024 and 2025 tables 24OBDG07 and 25OBDG03A: the check runs continuously with the ignition on, needs the condition five times in a row within 0.6 s and is rated Type B, so the MIL comes on after two trips. The voltage limit for the low side is left blank in the published tables. A low reading can also come from a pinched harness at the booster, from water in the connector or from a sensor that has failed internally. The sibling P25C7 covers a short to supply, C0579 the same fault on the second sensor.
- What you may notice
- Check engine lamp after two trips
- Brake system warning message
- Brake assistance may be limited
- Likely causes
- LikelySensor signal wire shorted to ground
- PossibleMoisture in the booster connector
- PossibleInternal short in the temperature sensor
- 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.