P2A49Alternative Fuel Tank C Pressure Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A49 is the mirror image of P2A48: the tank C pressure signal sits above the band a healthy sensor uses, so the module rejects it. In TransEco's AFCM table the tank A equivalent traces back to a sensor with an open circuit or a short to the supply. An open ground is a classic trigger too, because the input is then pulled toward its supply rail. The practical danger is a cylinder that seems full when it is not; the gauge stays high and the system may count on gas from tank C until the engine starts to falter on a near-empty supply. No manufacturer lists P2A49 publicly. With the system depressurised and the plug off, check whether the voltage at the module side still reads high; if so, the fault lies in the harness rather than the sensor.
- What you may notice
- Check engine light
- Gauge for tank C stays at full
- Hesitation once tank C really runs low
- Likely causes
- LikelyGround or signal wire of the tank C sensor interrupted
- PossibleSignal shorted to 5 V or battery voltage
- PossibleTank C sensor open internally
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.