P2A45Alternative Fuel Tank B Pressure Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2A45 completes the tank B pressure group with the case that the other codes miss: the signal is mostly fine but jumps or drops out for moments, faster than any real gas pressure could change. Typical culprits are a plug that loses contact on rough roads, a wire rubbed through along the frame rail or a sensor with a cracked solder joint. Because the fault comes and goes, a single clean reading proves nothing. How such faults age out is described in Ford's material on its 2003 bi-fuel CNG trucks: once the condition stops, the lamp goes dark three trips later and the stored code disappears after forty. No manufacturer documents P2A45 itself; the logic follows the tank A counterpart P01A2 and the CARB rules for input components. Wiggle the harness while watching live data.
- What you may notice
- Check engine light that comes and goes
- Gas gauge flickering or jumping
- Occasional unexpected switch to petrol on bi-fuel vehicles
- Likely causes
- LikelyTank B sensor plug with loose or corroded contacts
- PossibleHarness chafed along frame or gas line
- RareIntermittent internal fault in the sensor
- 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: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.