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DTC codes / P2Axx · Hybrid propulsion / P2AA8

P2AA8Engine Coolant Bypass Valve B Position Sensor Range/Performance

P2AA8 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the position sensor circuit for the engine coolant bypass valve B. The bypass valve regulates coolant flow to manage engine temperature and cabin heating, and its sensor reports the valve's actual position back to the PCM. The code is set when the sensor signal does not match the commanded position or falls outside the expected voltage range during self-tests.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

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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