P224CAlternative Fuel Tank Shutoff Valve A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P224C points to an open or otherwise faulty control circuit of shutoff valve A, the solenoid on a CNG or LPG tank that releases gas only when the engine runs on the alternative fuel. Such valves are normally closed. GM's 2015 bi-fuel Impala (bulletin PI1330) fits a high-pressure cut-off solenoid to the tank and energizes it in CNG mode while the engine cranks or runs; Ford's 2003 bi-fuel CNG documentation feeds its tank valve through the inertia switch and the ALT fuel relay. Neither publishes codes for the valve. No maker documents P224C publicly, and the CNG upfitter TransEco even files an open circuit under P224E. With the valve dead, bi-fuel cars carry on with gasoline; dedicated gas vehicles may not start.
- What you may notice
- Check engine light
- Vehicle will not switch to gas operation or falls back to gasoline
- Likely causes
- LikelyBroken wire or unplugged connector at the tank valve
- PossibleSolenoid coil of the valve open
- RareSupply interrupted by relay or tripped inertia switch
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.