P2A94Alternative Fuel Tank Select Valve A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A94 reports a control voltage at tank select valve A above what the module expects for the commanded state. On a valve switched to ground by the module, an open coil or broken lead leaves the line floating at supply voltage; alternatively a chafed wire contacts a battery feed that the output stage cannot pull down. Either way, valve A does not respond to commands and stays wherever its spring or the foreign voltage holds it. In the staged two-supply strategy patented by Cespira, the controller then cannot move to the second supply when the first falls below its threshold, or cannot leave it. Range shrinks or the engine falls back to its other fuel. No maker publishes P2A94. Check coil resistance, then the harness to the valve.
- What you may notice
- Malfunction lamp on
- No change to the next tank, gas runs out early
- Engine switches to its other fuel or reduced power
- Likely causes
- LikelyOpen coil or broken lead on a ground-switched valve A
- PossibleControl wire of valve A touching a battery feed
- RareCorroded pins with high resistance at valve A
- 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.