P01B5
Alternative Fuel Rail Temperature Sensor Performance
Generic OBD-II
Real-world scan data
Seen in
69
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 the wiring and connectors of the fuel rail temperature sensor for any damage or loose connections
- Inspect the fuel rail temperature sensor for any signs of malfunction or failure and replace if necessary
- Verify that the fuel rail temperature sensor is receiving the correct voltage and ground signals
- Clean the fuel rail and fuel injectors to ensure optimal performance and fuel delivery
- In rare cases, consider replacing the fuel rail itself if all other solutions have been exhausted
Common causes
Most likely first
- Faulty alternative fuel rail temperature sensor
- Loose or corroded electrical connections of the alternative fuel rail temperature sensor
- Clogged or restricted alternative fuel rail
- Defective alternative fuel injectors
- Malfunctioning engine control module (ECM)
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Poor fuel economy
- Difficulty starting the engine
- Stalling or hesitation during acceleration
- Illuminated check engine light
Read & clear P01B5 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.