P0091 Code - Fuel Pressure Regulator 1 Control Circuit Low
Quick Answer
The Engine Control Module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. Common causes include Faulty fuel pressure sensor, Fuel pressure sensor harness is open or shorted, Fuel pressure sensor electrical circuit poor connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0091 indicates Fuel Pressure Regulator 1 Control Circuit Low.
- Common causes
- Common causes include Faulty fuel pressure sensor, Fuel pressure sensor harness is open or shorted, Fuel pressure sensor electrical circuit poor connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0091 Description
What are the Possible Causes of the DTC P0091?
- Faulty fuel pressure sensor
- Fuel pressure sensor harness is open or shorted
- Fuel pressure sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0091?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0091 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0091 code?
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Need Help with the Code?
Get the P0091 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P0091 Buick — Fuel Pressure Regulator Control Circuit Low Voltage
- P0091 Cadillac — Fuel Pressure Regulator Control Circuit Low Voltage
- P0091 Chevrolet — Fuel Pressure Regulator Control Circuit Low Voltage
- P0091 Chrysler — Fuel Quantity Solenoid Short To Ground
- P0091 Dodge — Fuel Quantity Solenoid Short To Ground
- P0091 GMC — Fuel Pressure Regulator Control Circuit Low Voltage
- P0091 Isuzu — Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage
- P0091 Jeep — Fuel Quantity Solenoid Short To Ground
- P0091 Mazda — Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage
- P0091 Volvo — Fuel Pressure Regulator 1 Control Circuit Low
Frequently Asked Questions about P0091 Code
1. What are common symptoms of OBDII code P0091 (Fuel Pressure Regulator 1 Control Circuit Low)?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.
2. What are the possible causes of OBDII code P0091?
- The code P0091 can be caused by issues such as a faulty fuel pressure regulator, a defective fuel pump, wiring problems, or a malfunctioning fuel pressure sensor.
3. How can I diagnose the cause of OBDII code P0091?
- Diagnosing the cause of P0091 involves checking the fuel pressure regulator, fuel pump, wiring connections, and fuel pressure sensor for any faults or damage.
4. Can a dirty fuel filter trigger OBDII code P0091?
- Yes, a clogged or dirty fuel filter can cause a drop in fuel pressure, which may trigger the P0091 trouble code.
5. What are some repair tips for fixing OBDII code P0091?
- Repair tips include checking and cleaning the fuel pressure regulator, inspecting and replacing the fuel filter if necessary, and ensuring all wiring connections are secure.
6. Is it safe to continue driving with OBDII code P0091?
- It is not recommended to continue driving with the P0091 code present, as it can lead to potential engine damage and reduced fuel efficiency.
7. Can a DIY enthusiast fix OBDII code P0091 at home?
- Depending on the underlying cause, some DIY enthusiasts may be able to address the P0091 code by following repair guides and using basic tools. However, complex issues may require professional help.
8. How much does it typically cost to repair OBDII code P0091 at a mechanic?
- The cost of repairing P0091 can vary depending on the cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
9. Will resetting the trouble codes make OBDII code P0091 disappear permanently?
- Resetting the trouble codes may temporarily clear the P0091 code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.
10. Can extreme weather conditions affect the triggering of OBDII code P0091?
- Yes, extreme weather conditions such as very high or low temperatures can sometimes exacerbate fuel pressure-related issues, potentially leading to the activation of code P0091.
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