P2A99Alternative Fuel Tank Select Valve C Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A99 belongs to installations with at least three selectable vessels or supplies and reports an open or otherwise broken control circuit at select valve C. Published designs mostly show two vessels, such as Westport's LNG arrangement with one pump and a valve choosing the tank, or Cespira's pair of compressed-gas supplies; a third valve extends the same principle. With valve C unpowered, its vessel can neither be brought on line nor, depending on the rest position, taken off line, so the selection sequence breaks at that point. Take care not to confuse it with P2A26, the shutoff solenoid on tank C, or with the hydraulic pump select valve. No manufacturer documents P2A99. Check the plug, the lead and the coil of valve C.
- What you may notice
- Malfunction lamp on
- Third vessel stays full or is never isolated
- Total range reduced
- Likely causes
- LikelyDisconnected plug or broken lead at select valve C
- PossibleCoil of valve C burnt out
- RareModule output for valve C failed
- 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: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.