P2A27Alternative Fuel Tank Shutoff Valve C 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
- P2A27 points to valve C: electrically commanded, yet apparently still shut. With several cylinders on one manifold, a single tank that stays isolated rarely stops the engine; the others keep supplying gas, and the fault appears as shorter range or a cylinder that never empties. Ford's 2003 bi-fuel CNG system regulates to about 724 kPa and closes its tank valve below 517 kPa, which shows how gas pressure serves as the yardstick for such checks. No manufacturer publishes P2A27 or how it is tested. Contamination, a sticking armature, too little coil voltage and a closed hand valve on that cylinder are the obvious suspects. Its electrical sister codes are P2A26, P2A28 and P2A29; P2A47 rates the tank C pressure sensor.
- What you may notice
- Check engine light
- Cylinder C never empties
- Shorter range on gas
- Likely causes
- PossibleSticking or contaminated armature in valve C
- PossibleHand valve on cylinder C closed
- RareCoil voltage too low because of a poor feed or ground
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.