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DTC codes / P23xx · Ignition system and misfire / P23C6
P23C6 indicates that the powertrain control module (PCM) has detected an excessive current draw or an abnormally high temperature within the control circuit driver for the engine coolant bypass valve 'C'. This valve manages coolant flow to optimize engine warm-up and cabin heating, and the fault points to a problem in the electrical driver stage rather than the valve's mechanical operation.
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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