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P1460 on a GM vehicle indicates that the powertrain control module (PCM) has detected a fault within the cooling fan control system, typically an open or short circuit in the fan relay control circuit or a malfunction of the fan clutch. The PCM commands the fan on and monitors the circuit for expected voltage changes; when the feedback does not match the command, it sets this code and may default the fan to full speed for safety.
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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