C0277 code meaning
Brake Pedal Position Sensor Circuit
What C0277 means
The publicly available J2012 tables omit C0277; GM assigns it to the brake pedal position sensor, not for a booster vacuum sensor. In the 2011 Saab 9-4X the body module watches the sensor with 9 to 16 V supply and the brake applied: failure type 06 means the signal or 5 V reference line is grounded or interrupted, 07 that a line touches battery voltage or the low reference is open, 09 a signal changing too fast, 4B a sensor whose rest position was never learned. GM bulletin 19-NA-202 for the 2016 to 2019 Malibu lists the same subcodes and fixes false C0277 with brake module software; PIT5181A for 2012 to 2014 full-size trucks points to connector X205. Effects include dead stop lamps, cruise control faults and a Service Stabilitrak message.
C0277 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0277
- Rear stop lamps inoperative
- Service Stabilitrak message, traction control lamp on
- Cruise control cannot be set or drops out
Common causes of C0277
- Most likelyLoose, backed-out or bent terminals in the sensor connector or GM connector X205
- PossibleShort or open in signal, 5 V reference or low reference wire
- PossibleBrake module software (GM 19-NA-202) or rest position not learned
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pedal position sensorBody control moduleBrake control module
What each part of C0277 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 77 | The exact fault in that area. |
What to do next
- Note C0277 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 C0277
What does C0277 mean?
C0277 means "Brake Pedal Position Sensor Circuit". The publicly available J2012 tables omit C0277; GM assigns it to the brake pedal position sensor, not for a booster vacuum sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with C0277?
Drive gently and only to a workshop. With C0277 the car can go into limp mode (reduced power) to protect itself.
Will C0277 fail an emissions test?
C0277 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 C0277 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0277 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.