What does code P0AA2 mean?

Q: What does code P0AA2 mean?

Hybrid/EV Battery Positive Contactor Circuit Stuck Open. P0AA2 indicates that the hybrid or electric vehicle battery pack's positive contactor, a high-voltage relay that connects the battery to the rest of the vehicle, is stuck in the open position, preventing power from flowing. The battery energy control module detects this by comparing commanded contactor state with actual voltage readings and sets the code when the contactor fails to close when requested.

DTC codes / P0Axx · Hybrid propulsion / P0AA2

P0AA2Hybrid/EV Battery Positive Contactor Circuit Stuck Open

P0AA2 indicates that the hybrid or electric vehicle battery pack's positive contactor, a high-voltage relay that connects the battery to the rest of the vehicle, is stuck in the open position, preventing power from flowing. The battery energy control module detects this by comparing commanded contactor state with actual voltage readings and sets the code when the contactor fails to close when requested.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

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.