P1276
Accelerator Pedal Position Sensor 1 Circuit Performance
What it means
P1276. Accelerator Pedal Position Sensor 1 Circuit Performance. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban.
Findings, check these first
- Drifting APP Sensor 1 out of rationality range
- Intermittent open in the APP Sensor 1 circuit
- Weak 5V reference under electrical load
- Aftermarket remote-start taps spliced into pedal wiring
- PCM needing a calibration update for APP rationality
Standard procedure
- Compare APP Sensor 1 against APP Sensor 2 and 3 on a Tech2 or GDS2
- Remove any aftermarket splices in the pedal harness and restore wiring
- Load-test the 5V reference circuit with all sensors connected
- Check for PCM calibration updates covering APP rationality
- Replace the pedal assembly only if the sensor drifts with clean wiring, then clear and road test
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Sources and review
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Last updated 2026-09-13.
Report a correction for P1276. Include your vehicle, the issue and a source if you have one.