P2A23
Alternative Fuel Tank Shutoff Valve B Control Circuit Performance/Stuck Off
The control circuit of alternative fuel tank shutoff valve B reports a control circuit performance/stuck off 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.
- Shutoff valve mechanically stuck closedCommon
- Coil force degraded with agePossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Alt Fuel Tank Shutoff Valve B
- Wiring Harness
- Afcm
P2A23 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.