Powertrain, generic (extended)

P224D Alternative Fuel Tank Shutoff Valve A Control Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Manual tank valve closed or tank nearly empty
Valve plunger stuck closed, e.g. by contamination
Supply voltage too low to pull the solenoid open
Faulty gas pressure sensor misreporting the response

Symptoms

  • Check engine light
  • Engine switches back to gasoline or will not run on gas
  • Gas fuel gauge shows content although no gas is delivered

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alternative fuel shutoff valve

Related codes

P224CP224EP224FP2A23

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.