Powertrain Enriched, not yet reviewed Lights the check engine lamp

P2AA0: Alternative Fuel Return Line Valve Control Circuit Low

Standardized SAE J2012 code · P2Axx codes

What does P2AA0 mean?

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.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Common causes

High Control wire shorted to ground
Medium Internal short in valve coil
Low Connector pins corroded - high contact resistance

Likelihood is a general estimate across vehicles; your make and model may differ.

Add your car to see reports of P2AA0 on the same make and model first.

P2AA0 in the community

Ask about P2AA0

No one has posted about P2AA0 yet

Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.

Describe your P2AA0 problem

At a glance

System: Powertrain
Repair difficulty: Medium · Workshop recommended
Typical labour: 1–4 h
Typical cost: €180–€800
Emissions-related: Yes — may fail an emissions test
Limp mode: Possible — power may be reduced

Components involved

Alt fuel return line valve
Wiring harness
Afcm

Reading this code

Any generic OBD-II scanner reads standardized P2 codes from the engine module.

Find a diagnostic tool

Sources

The explanation was compiled from the cited sources but has not had an individual review yet.

Data: OBDex (CC0), revision 3eca5de.