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.
High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
Symptoms
- Check engine light that comes and goes
- Gas gauge flickering or jumping
- Occasional unexpected switch to petrol on bi-fuel vehicles
Most likely causes
- Tank B sensor plug with loose or corroded contacts
- Harness chafed along frame or gas line
- Intermittent internal fault in the sensor
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It affects emissions.
What each character of P2A45 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- A: Hybrid or air and fuel
- 45: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2A45?
If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
What causes code P2A45?
The most common causes are: tank B sensor plug with loose or corroded contacts; harness chafed along frame or gas line; intermittent internal fault in the sensor.
Related codes
- P2A41Alternative Fuel Tank B Pressure Sensor Circuit
- P2A42Alternative Fuel Tank B Pressure Sensor Range/Performance
- P2A43Alternative Fuel Tank B Pressure Sensor Circuit Low
- P2A44Alternative Fuel Tank B Pressure Sensor Circuit High
- P01A2Alternative Fuel Tank A Pressure Sensor Circuit Intermittent/Erratic
- P2A4AAlternative Fuel Tank C Pressure Sensor Circuit Intermittent/Erratic
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.