P01A1
Alternative Fuel Tank A Pressure Sensor Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections of the alternative fuel tank pressure sensor
- Ensure that the alternative fuel tank pressure sensor is functioning correctly
- Inspect and potentially replace the fuel tank pressure sensor
- Verify the pressure in the alternative fuel tank and address any abnormalities
Common causes
Most likely first
- Faulty or malfunctioning alternative fuel tank pressure sensor
- Clogged or blocked fuel tank pressure sensor circuit
- Defective or damaged wires or connectors in the alternative fuel tank pressure sensor circuit
- High pressure or excessive pressure in the alternative fuel tank
- Software or programming issue related to the alternative fuel tank pressure sensor circuit
How to diagnose & fix
Work through it in order
- Check engine light or malfunction indicator lamp (MIL) illuminates on the dashboard
- Reduced engine power or loss of engine performance
- Difficulty starting the vehicle or stalled engine
- Poor fuel efficiency or decreased gas mileage
- Increased emissions or failed emissions test
Read & clear P01A1 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.