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P1575 on a GM vehicle means the powertrain control module (PCM) has detected an implausible signal from the extended travel brake switch circuit, which is the second set of contacts inside the brake pedal assembly used to verify that the brake pedal is actually being pressed. The PCM compares this extended travel switch against the primary brake switch and the cruise control release circuit, and it sets the code when the two disagree for longer than a calibrated time.
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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