What does code P2AA1 mean?

Q: What does code P2AA1 mean?

Alternative Fuel Return Line Valve Control Circuit High. P2AA1 indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for the alternative fuel return line valve, which typically points to an open circuit, a short to voltage, or a failed valve solenoid. The computer expects the circuit to pull the voltage low when the valve is commanded, so a persistent high reading tells it the circuit is not responding as designed.

DTC codes / P2Axx · Hybrid propulsion / P2AA1

P2AA1Alternative Fuel Return Line Valve Control Circuit High

P2AA1 indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for the alternative fuel return line valve, which typically points to an open circuit, a short to voltage, or a failed valve solenoid. The computer expects the circuit to pull the voltage low when the valve is commanded, so a persistent high reading tells it the circuit is not responding as designed.

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.