DTC codes / P26xx · Computer and output circuits / P2682
P2682 means the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for the engine coolant bypass valve, which is the valve that routes coolant around the radiator to speed warm-up. The PCM commands the valve to move and monitors the circuit, and a low reading tells it the circuit is shorted to ground or the valve's internal coil has failed.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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