DTC codes / P26xx · Computer and output circuits / P26FA
P26FA indicates that the engine control module has detected an overspeed condition of the coolant pump or has inferred that air is present in the cooling system, based on pump speed feedback that exceeds the commanded value or is inconsistent with expected flow. The code is set when the pump's actual speed, reported by its internal sensor, is higher than the commanded speed for a calibrated time, or when the pump speed fluctuates in a way that suggests it is running dry or ingesting air.
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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