P1282 on a GM vehicle means the engine control module (ECM) has detected a low-voltage condition on the signal circuit from accelerator pedal position (APP) sensor 2. The ECM expects a specific voltage range from this second sensor to cross-check the primary APP sensor, and a sustained low reading indicates a fault in the sensor, its wiring, or the reference circuit.
Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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