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

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.

High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

If you smell gas, shut off the supply, ventilate and do not start the engine
Compare the reading with other engine data while varying the engine speed.
Read the codes with a compatible scanner
Check the connectors and wiring of the component indicated
Leave any work on the gas circuit to an authorized shop

Good to know

Repair difficulty: hard
It affects emissions.

What each character of P224D means

P: Powertrain: engine and transmission
2: Generic code: same on every make
2: Fuel injection
4D: Specific fault in that system

Frequently asked questions

Can I keep driving with code P224D?

If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

What causes code P224D?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.