P2AA0
Alternative Fuel Return Line Valve Control Circuit Low
The control circuit of the alternative fuel return line valve reports a control circuit low condition. Excess fuel return to the tank cannot be commanded as expected.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in valve coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Alt Fuel Return Line Valve
- Wiring Harness
- Afcm
P2AA0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.