DTC codes / P26xx · Computer and output circuits / P26BB
P26BB indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the engine coolant bypass valve circuit, specifically on the 'C' control circuit. The PCM monitors the valve's electrical response and its effect on coolant flow, and it sets this code when the valve fails to move as commanded or the circuit signal falls outside the expected range.
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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