What does code P26AA mean?

DTC codes / P26xx · Computer and output circuits / P26AA

P26AAEngine Coolant Bypass Valve A Position Sensor Maximum Stop Performance

P26AA indicates that the engine control module has detected a performance problem with the maximum stop position of the coolant bypass valve position sensor. The computer expects the sensor signal to reach a specific maximum value when the valve is commanded to its fully closed or open stop, but the signal does not meet that expectation within the allowed time or range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.