P2A41Alternative Fuel Tank B Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Some multi-tank CNG installations give a second cylinder, tank B, its own pressure transducer, so the module knows the remaining gas per tank and can check that the tank valve responds. P2A41 is the general electrical fault of that sensor, set when the circuit is faulty without a clear verdict of low or high. Publications only describe the single sensor of tank A: on Ford's 2003 bi-fuel CNG trucks it is built into the regulator and drives the gauge, which the AFCM forces to empty when the sensor fails. The upfitter TransEco substitutes a fixed 3600 psi and keeps running. No manufacturer lists P2A41. Check the 5 V feed, signal and ground at the tank B sensor plug first; P2A43 and P2A44 separate the low and high cases, P2A45 brief dropouts.
- What you may notice
- Check engine light
- Gas gauge wrong or showing empty
- Tank B possibly no longer used
- Likely causes
- LikelyPlug at the tank B sensor loose, corroded or harness damaged
- PossibleTank B pressure sensor faulty
- Possible5 V reference 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.