P2A48Alternative Fuel Tank C Pressure Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- With P2A48 the voltage from the tank C pressure sensor has fallen beneath the lowest value a working sensor ever outputs, even with the cylinder empty. In such three-wire circuits a low reading points to the signal line touching ground, a dead 5 V supply or a short inside the transducer. The gas conversion specialist TransEco attributes its tank A Low code to a sensor shorted to ground and lets the AFCM continue with a fixed 3600 psi substitute while the lamp is on. For the driver, tank C looks drained: the gauge may sink and the module may skip that cylinder although it is still full. No manufacturer documents P2A48 itself. If the reference wire also feeds other sensors, a short elsewhere on it can trigger this code.
- What you may notice
- Check engine light
- Tank C reported empty despite being filled
- Less gas range than expected
- Likely causes
- LikelySignal wire of the tank C sensor touching ground
- Possible5 V reference open or shorted by another sensor on the same line
- PossibleInternal short in the tank C transducer
- 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.