What does code P1277 mean?

Q: What does code P1277 mean?

Accelerator Pedal Position Sensor 1 Circuit Low Voltage. P1277 on a GM vehicle means the engine control module (ECM) has detected that the signal voltage from accelerator pedal position sensor 1 is lower than the expected range for the current pedal position. The ECM compares this signal against sensor 2 and its own calculated limits, and when sensor 1 stays below the low-voltage threshold, it logs this code and typically commands reduced engine power.

DTC codes / GM codes / P1277

P1277 · GMAccelerator Pedal Position Sensor 1 Circuit Low Voltage

P1277 on a GM vehicle means the engine control module (ECM) has detected that the signal voltage from accelerator pedal position sensor 1 is lower than the expected range for the current pedal position. The ECM compares this signal against sensor 2 and its own calculated limits, and when sensor 1 stays below the low-voltage threshold, it logs this code and typically commands reduced engine power.

SystemPowertrain

Code typeGM specific

SeverityHigh

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.