P0091
Fuel Pressure Regulator 1 Control Circuit Low
Generic code
Fuel and Air Metering
High severity
Hard repair
Free on OBD DashX
Want real-world data on P0091?
See which problems come with P0091, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0091 means
- The fault code P0091 indicates that the fuel pressure regulator control circuit is detecting a low voltage signal. This may cause the fuel system to not function properly, resulting in poor engine performance or even engine stalling.
Possible symptoms
- Illuminated check engine light
- Poor engine performance
- Engine stalling or not starting
- Reduced fuel efficiency
Possible causes
- Faulty fuel pressure regulator
- Damaged or corroded wiring or connections in the fuel pressure regulator circuit
- Failed fuel pump
- Malfunctioning fuel pressure sensor
Related parts
- Fuel Pressure Regulator: Fuel pressure regulator controls the fuel pressure and returns any excess fuel to the tank. Problems lead to engine misfire, poor fuel economy & poor acceleration
Possible solutions
- Replace the fuel pressure regulator
- Check and repair any damaged or corroded wiring or connections in the fuel pressure regulator circuit
- Replace the fuel pump if necessary
- Replace the fuel pressure sensor if necessary
Free on OBD DashX
P0091 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0091 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.