P224C
Alternative Fuel Tank Shutoff Valve A Control Circuit/Open
The drive circuit for the shutoff valve at the alternative-fuel tank A is open. Bi-fuel vehicles (CNG, LPG, hydrogen) use a high-pressure shutoff valve at the tank for safety; with this fault the alternative fuel cannot be drawn from the tank.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Solenoid winding openCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Alternative Fuel Shutoff Valve
P224C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.