P2A22Alternative Fuel Tank Shutoff Valve B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A22 covers the drive circuit of shutoff valve B, the electric lock on a further gas cylinder of a multi-tank CNG or LPG installation, when the module finds no current path at all. A broken lead, a loose plug or a burnt-out coil are the usual findings. No manufacturer documents P2A22 publicly; the upfitter TransEco lumps an open line into its Low code P2A24 instead. New Flyer's CNG bus bulletin SMB-169 suggests a quick test for a dead tank solenoid: swap its coil with the one from a neighbouring valve. CARB's comprehensive component rules require such outputs to be checked for wiring faults. With one cylinder isolated, the remaining tanks still feed the engine, so reduced range is often the first thing a driver notices.
- What you may notice
- Check engine light
- Noticeably shorter range on gas
- Gas left in one cylinder after the others are empty
- Likely causes
- LikelyBroken lead or disconnected plug at the valve on tank B
- PossibleBurnt-out solenoid coil of valve B
- RareCorroded terminals in the valve connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.