OBD-II FAULT CODE
P0091
Fuel Pressure Regulator 1 Control Circuit Low
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0091.
- Check Engine light
- Poor drivability or reduced fuel economy depending on fault
- Hard start, hesitation, stalling or inaccurate fuel reading depending on component
- Low fuel pressure
- Faulty pump/regulator/sensor
- Wiring fault
- Clogged filter
- Injector fault
- Scan all modules and record freeze-frame data before clearing codes
- Check battery voltage and related fuses
- Check fuel pressure and sensor data
- Inspect pump/injector fuses, relay, wiring and grounds
- Check sensor reference voltage, ground and signal voltage
- Repair wiring/relay issues, replace clogged filter, failed pump/sensor/injector only after testing
- Repair poor ground/power feed or replace confirmed faulty sensor
Related Codes
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Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.