P01B6
Alternative Fuel Rail Temperature Sensor Circuit Low
Generic OBD-II
Common symptoms
What you'll notice
- Check and clean the fuel rail temperature sensor connector
- Replace the alternative fuel rail temperature sensor
- Inspect and repair any damaged wiring or connections in the sensor circuit
- Verify and reset the ECM (engine control module) if necessary
Common causes
Most likely first
- Faulty alternative fuel rail temperature sensor
- Loose or corroded electrical connections or wiring related to the alternative fuel rail temperature sensor circuit
- Faulty engine control module (ECM)
- Issues with the fuel system, such as a clogged fuel filter or low fuel pressure
- Engine overheating or running at an abnormal temperature
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased fuel efficiency
- Engine stalls or has difficulty starting
- Lack of power or acceleration
- Illumination of the check engine light
Read & clear P01B6 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.