P2A46Alternative Fuel Tank C Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Larger CNG installations, for instance on trucks or buses, may carry three or more cylinders. Where a third one, tank C, has its own pressure transducer, P2A46 reports a general electrical fault in that sensor's circuit, stored when the module finds the signal unusable but cannot classify it as too low or too high. Publicly described is only the single tank sensor of simpler systems: Ford placed it inside the regulator of its 2003 bi-fuel CNG pickups and let the AFCM derive the gauge reading from it. No manufacturer lists P2A46. In practice the first checks are the three wires at the tank C sensor, the connector seal and the shared 5 V feed; the narrower codes P2A48 and P2A49 name a low or high signal, P2A4A short interruptions.
- What you may notice
- Check engine light
- Remaining gas shown wrongly
- Tank C may be left unused
- Likely causes
- LikelyWiring or plug at the tank C sensor damaged, loose or wet
- PossibleTank C pressure sensor faulty
- RareShared 5 V supply or sensor ground disturbed
- 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.