P2A22
Alternative Fuel Tank Shutoff Valve B Control Circuit/Open
The control circuit of alternative fuel tank shutoff valve B reports a control circuit/open condition. Tank isolation cannot be commanded as expected on multi-tank CNG/LPG systems.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open in valve control wireCommon
- Open valve coilPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Alt Fuel Tank Shutoff Valve B
- Wiring Harness
- Afcm
P2A22 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.