P01A6
Alternative Fuel Rail Pressure Sensor Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the fuel pressure sensor for any physical damage or loose connections.
- Inspect and clean the fuel rail for any debris or clogs that may be causing high pressure readings.
- Verify the fuel pressure regulator for proper functioning and adjust if necessary.
- Test the fuel pump for any malfunctions or irregularities in pressure output.
- Diagnose the ECU (Engine Control Unit) for any potential issues or faults in regulating fuel pressure.
Common causes
Most likely first
- Faulty or malfunctioning alternative fuel rail pressure sensor
- Clogged fuel filter restricting fuel flow
- Issues with the fuel pump or fuel pressure regulator
- Problems with the fuel injectors
- Faulty engine control module (ECM) or powertrain control module (PCM) connection
How to diagnose & fix
Work through it in order
- Check engine light illuminates on the dashboard
- Decreased engine performance and power
- Difficulty starting the vehicle or motorcycle
- Poor fuel economy
- Engine stalling or intermittent idle issues
Read & clear P01A6 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.