P2A25Alternative Fuel Tank Shutoff Valve B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A25 reports a voltage on the control circuit of tank valve B that is higher than the module expects, mostly because the wire touches a battery feed. TransEco Energy's fault table names a short to power as the cause, turns on the MIL and lets the gas system carry on. The real risk lies elsewhere: a solenoid held by foreign voltage stays open even when the module wants the cylinder isolated, for instance after the engine stops. Ford's 2003 bi-fuel CNG documentation shows why that matters, since its module shuts the tank valve once gas pressure falls under 517 kPa. Ford's Boss 302S list names P2A25 as well. P2A24 is the low-side partner; for valve A the equivalent code is P224F.
- What you may notice
- Check engine light
- Tank B may stay open with the engine off
- Likely causes
- LikelyControl wire of valve B touching a battery feed
- PossibleOutput stage for valve B in the module stuck on
- RareWiring mistake during conversion or repair
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.