P2A96Alternative Fuel Tank Select Valve B Control Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2A96 is about tank select valve B working electrically but not doing what it is told. In an LNG layout like the one in Westport's US8726785B2, where one pump draws from either of two vessels through an insulated select valve, the module can verify the switch from the pump's behaviour: right after selecting a full vessel, the drive work per stroke should be normal, whereas a reading that stays low suggests the pump still sits on the empty side. The same patent warns that low work can also come from a mechanical defect, so a plausible check compares readings before and after the command. Cold-stiffened seals, ice and debris can hold the valve back. No manufacturer publishes P2A96 or its test window.
- What you may notice
- Malfunction lamp on
- Gas supply drops right after a tank change
- One vessel stays full while the other runs dry
- Likely causes
- LikelyValve B held by ice or cold-hardened seals
- PossibleDebris preventing valve B from shifting fully
- RarePump defect interpreted as a select valve problem
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.