OBD-II code · Powertrain (generic, extended)
P2AA1 Alternative Fuel Return Line Valve Control Circuit High
The control circuit of the alternative fuel return line valve reports a control circuit high condition. Excess fuel return to the tank cannot be commanded as expected.
Is it safe to drive with P2AA1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to B+
- PossibleOpen valve coil
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Alt Fuel Return Line Valve, Wiring Harness, Afcm
Related codes
- P2A9EAlternative Fuel Return Line Valve Control Circuit/Open
- P2A9FAlternative Fuel Return Line Valve Control Circuit Range/Performance
- P2AA0Alternative Fuel Return Line Valve Control Circuit Low
- P2AA2Alternative Fuel Return Line Insufficient Flow
- P2AA3Cold Start EGR B Flow Insufficient Detected
- P2AA4Cold Start EGR B Flow Excessive Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.