P2A27 code meaning
Alternative Fuel Tank Shutoff Valve C Control Circuit Performance/Stuck Off
Powertrain system Generic code P2Axx codes Check engine light
What P2A27 means
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.
P2A27 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2A27
- Check engine light
- Cylinder C never empties
- Shorter range on gas
Common causes of P2A27
- PossibleSticking or contaminated armature in valve C
- PossibleHand valve on cylinder C closed
- Less likelyCoil voltage too low because of a poor feed or ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel tank shutoff valve cWiring harnessAfcm
What each part of P2A27 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 27 | The exact fault in that area. |
What to do next
- Note P2A27 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2A27
What does P2A27 mean?
P2A27 means "Alternative Fuel Tank Shutoff Valve C Control Circuit Performance/Stuck Off". P2A27 points to valve C: electrically commanded, yet apparently still shut. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A27?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2A27 fail an emissions test?
Yes, it can. P2A27 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A27 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2A27 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.