P2A97Alternative Fuel Tank Select Valve B Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A97 indicates that the drive line of tank select valve B reads too low. If the module feeds the valve from the positive side, a short to ground in the wire or a coil with shorted windings drags the output down, and the stage switches off to protect itself, so valve B falls back to its spring position. If the module switches the ground side instead, the same short can hold the valve energised all the time. The practical effect is that the choice of vessel no longer follows the strategy: in the staged scheme Cespira patented for two gas supplies, the controller cannot react when a supply reaches its lower pressure limit. No manufacturer documents P2A97. Look for chafing where the harness crosses tank straps and brackets. P2A98 is the high counterpart.
- What you may notice
- Malfunction lamp on
- Tank change does not happen or happens at the wrong time
- Gas mode ends early with fuel still on board
- Likely causes
- LikelyWire to valve B chafed against a tank strap or bracket
- PossibleShorted windings in the coil of valve B
- RareMoisture bridging the pins of the valve B plug
- 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.