P2A92Alternative Fuel Tank Select Valve A Control 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
- P2A92 is the functional check for tank select valve A: the wiring tests pass, yet the fuel system does not behave as if the commanded vessel were connected. Software can judge this only through pressures. A patent by Cespira, the Westport and Volvo venture, outlines the logic for two compressed-gas supplies with their own pressure sensors: a supply-select valve assembly routes one supply to a compressor and the other to the regulator, and stages change whenever a supply falls under a set pressure. After such a command the newly chosen supply should start to lose pressure while the other holds steady. If nothing changes, or the wrong tank empties, valve A is probably sticking or leaking across its seat. No manufacturer publishes P2A92 or a threshold for it.
- What you may notice
- Malfunction lamp on
- Tanks empty unevenly or in the wrong order
- Short gas supply although one vessel still holds fuel
- Likely causes
- LikelySelect valve A sticking from dirt, ice or wear
- PossibleValve A leaking across its seat so both vessels are drawn
- RareTank pressure sensor giving a misleading reading
- 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.