P2A2AAlternative Fuel Tank Shutoff Valve D Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A2A marks an interrupted control circuit at shutoff valve D, which only exists on installations with four or more gas cylinders, mostly commercial trucks, vans and buses. When the module energizes the coil and measures no current, it stores this code. No manufacturer documents P2A2A publicly. If valves A to D all report open circuits at once, a shared feed is the suspect: in Ford's 2003 bi-fuel CNG design the tank solenoid draws its power through the inertia switch and the ALT fuel relay, and a multi-tank system wired that way would lose every valve together. A single code instead points to the coil, plug or lead of valve D. CARB's comprehensive component monitoring forms the legal basis.
- What you may notice
- Check engine light
- Reduced usable gas quantity
- Likely causes
- LikelyBreak in the branch of the harness leading to valve D
- PossibleCoil of valve D open
- RareCommon supply via relay or inertia switch interrupted (several valve codes at once)
- 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.