What does code P2AA9 mean?

Q: What does code P2AA9 mean?

Engine Coolant Bypass Valve B Position Sensor Circuit Low. P2AA9 means the powertrain control module has detected a low-voltage signal from the position sensor inside the engine coolant bypass valve for circuit B. The sensor is supposed to report the valve's actual position, and a low reading tells the computer the signal wire is shorted to ground or the sensor has failed.

DTC codes / P2Axx · Hybrid propulsion / P2AA9

P2AA9Engine Coolant Bypass Valve B Position Sensor Circuit Low

P2AA9 means the powertrain control module has detected a low-voltage signal from the position sensor inside the engine coolant bypass valve for circuit B. The sensor is supposed to report the valve's actual position, and a low reading tells the computer the signal wire is shorted to ground or the sensor has failed.

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.