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P1662 on GM vehicles indicates the powertrain control module (PCM) has detected a fault in the cruise control inhibit circuit, which is the wiring that allows the PCM to disable cruise control under certain conditions such as braking or when the transmission is not in a cruising gear. The PCM monitors the circuit for expected voltage changes and sets this code when the signal is out of range or missing.
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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