P25C6 code meaning
Brake Booster Temperature Sensor A Circuit Low
Powertrain system Generic code P25xx codes Check engine light
What P25C6 means
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.
P25C6 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P25C6
- Check engine lamp after two trips
- Brake system warning message
- Brake assistance may be limited
Common causes of P25C6
- Most likelySensor signal wire shorted to ground
- PossibleMoisture in the booster connector
- PossibleInternal short in the temperature sensor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Electric brake boosterTemperature sensorWiring harness
What each part of P25C6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| C6 | The exact fault in that area. |
What to do next
- Note P25C6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P25C6
What does P25C6 mean?
P25C6 means "Brake Booster Temperature Sensor A Circuit Low". P25C6 means the signal of brake booster temperature sensor A is too low, which GM describes as the sensor line being shorted to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P25C6?
Drive gently and only to a workshop. With P25C6 the car can go into limp mode (reduced power) to protect itself.
Will P25C6 fail an emissions test?
P25C6 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P25C6 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P25C6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.