What does code P2AAA mean?

Q: What does code P2AAA mean?

Engine Coolant Bypass Valve B Position Sensor Circuit High. P2AAA indicates that the powertrain control module (PCM) has detected an abnormally high voltage signal from the position sensor circuit of engine coolant bypass valve B. This high voltage typically means the sensor signal wire is shorted to power, the sensor's ground reference is lost, or the sensor itself has failed internally, causing the PCM to see a voltage above the expected range.

DTC codes / P2Axx · Hybrid propulsion / P2AAA

P2AAAEngine Coolant Bypass Valve B Position Sensor Circuit High

P2AAA indicates that the powertrain control module (PCM) has detected an abnormally high voltage signal from the position sensor circuit of engine coolant bypass valve B. This high voltage typically means the sensor signal wire is shorted to power, the sensor's ground reference is lost, or the sensor itself has failed internally, causing the PCM to see a voltage above the expected range.

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.