P01B7
Alternative Fuel Rail Temperature Sensor Circuit High
Generic OBD-II
Real-world scan data
Seen in
24
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check and clean the fuel rail temperature sensor
- Inspect and repair any damaged wiring or connectors related to the fuel rail temperature sensor
- Replace the fuel rail temperature sensor with a new one
- Ensure that the engine control module (ECM) is functioning properly and update it if necessary.
Common causes
Most likely first
- Faulty alternative fuel rail temperature sensor
- Wiring or connector issues with alternative fuel rail temperature sensor
- Engine control module (ECM) software or calibration issue
- Fuel supply problem, such as contaminated fuel or low fuel pressure
- Malfunctioning engine coolant temperature sensor affecting readings for alternative fuel rail temperature
How to diagnose & fix
Work through it in order
- Dim or flickering headlights
Read & clear P01B7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.