P2A2FAlternative Fuel Tank Shutoff Valve E 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
- P2A2F signals that valve E was energized but the system did not see the expected gas flow from that cylinder. No manufacturer publishes this code or its test conditions; CARB only requires output components to be checked for a proper reaction to commands. New Flyer's bulletin explains that its tank solenoids switch on while the starter spins the engine to about 400 rpm. A weak battery or a voltage dip during cranking can therefore leave a coil unable to lift its armature, which looks exactly like a valve that hangs shut. GM's bi-fuel Impala regulates gas to 468 to 896 kPa, a useful reference when checking the low-pressure side. Contamination and a closed manual valve remain obvious mechanical causes.
- What you may notice
- Check engine light
- Cylinder E does not empty
- Fault appears mainly after cold or weak-battery starts
- Likely causes
- PossibleVoltage drop during cranking, coil cannot lift the armature
- PossibleContaminated or sticking valve E
- RareManual valve on cylinder E closed
- 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.