P224DAlternative Fuel Tank Shutoff Valve A Control Circuit Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P224D means tank shutoff valve A is electrically switched but the system behaves as if it stayed shut. Software can only infer that from a pressure response: once the valve is commanded open, line or rail pressure should climb toward the regulated value, which GM gives as 468-896 kPa for the bi-fuel Impala and Ford as about 724 kPa for its 2003 CNG trucks. Ford's control module also closes the tank valve itself if gas pressure sinks under 517 kPa. No maker documents P224D publicly; some code lists call it Range/Performance instead of Stuck Off. Possible reasons are a seized plunger, a closed manual tank valve or an empty tank. Bi-fuel vehicles return to gasoline, dedicated ones lose power or stall.
- What you may notice
- Check engine light
- Engine switches back to gasoline or will not run on gas
- Gas fuel gauge shows content although no gas is delivered
- Likely causes
- PossibleManual tank valve closed or tank nearly empty
- PossibleValve plunger stuck closed, e.g. by contamination
- RareSupply voltage too low to pull the solenoid open
- RareFaulty gas pressure sensor misreporting the response
- 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.