P0091 OBD-II Trouble Code: Fuel Pressure Regulator 1 Control Circuit Low

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Cost of diagnosing the P0091 code

P0091 is a diagnostic trouble code (DTC) for "Fuel Pressure Regulator 1 Control Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$69.99$20.00
BMW$69.99$20.00
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Check Engine Light

P0091 code definition

Fuel Pressure Regulator 1 Control Circuit Low

What the P0091 code means

P0091 means that the Powertrain Control Module (PCM) has detected fuel pressure that is outside the specification set by the manufacturer.

What are the causes of the P0091 code?

  • Faulty fuel pump
  • Faulty fuel pump relay
  • Faulty PCM
  • Faulty electric fuel pressure regulator
  • Restriction in the fuel filter or other parts of the fuel system
  • Damaged wiring such as a short to ground
  • Fuel tank low on fuel

What are the symptoms of the P0091 code?

  • No start or rough start condition
  • Stalling during acceleration
  • Lack of power
  • Poor fuel economy

In some cases, the engine may start but the starter may need to crank longer in order to achieve this. It is also possible that other trouble codes will accompany P0091

How does a mechanic diagnose the P0091 code?

A mechanic may start with a good visual inspection of the fuel system, including:

  • Fuel tank
  • Fuel pump
  • Fuel filter
  • Lines and hoses
  • Electrical wiring
  • Electrical connectors
  • Sensors
  • Injectors

There may be other parts of your vehicle's fuel system not listed here that are specific to your particular vehicle.

During a through inspection, the mechanic will note any obvious damages to the system and repair them before proceeding with the diagnosis.

After the visual inspection has been performed, the mechanic will perform a fuel pressure test to test the functionality of all fuel system sensors.

Common mistakes when diagnosing the P0091 code.

A common mistake when diagnosing the P0091 code would be replacing the fuel pressure regulator or fuel pump without knowing for sure they are bad.

Sometimes, mechanics will see a trouble code and take that for what is actually wrong with the car. A trouble code is simply a sensor giving a reading that the Powertrain Control Module sees as out of specification. Just because a particular part is mentioned in a trouble code, it does not mean that the part is faulty.

How serious is the P0091 code?

The P0091 code can be very serious as it affects the way the engine runs and could potentially stop the engine from starting; it could likely leave a driver stranded on the side of the road. It would behoove the driver of a vehicle with this code stored to have this issue diagnosed and repaired as soon as possible in order to prevent the possibility of a break down.

What repairs can fix the P0091 code?

Additional comments regarding the P0091 code.

  • It is very important to take other codes stored with the P0091 code into consideration during diagnosis, as the P0091 code by itself may mean something different than if it were accompanied by other diagnostic trouble codes.

Need help with a P0091 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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P0091

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Todd

Todd

23 years of experience
23 reviews
Todd
23 years of experience
Todd was on time. He took his time to ask questions and provide feedback. Walked me thru each step he was doing and why. Will be booking Todd again for my repair. Price and quote matched and he provided an estimate for my repair that is reasonable.
2008 VOLKSWAGEN JETTA - CHECK ENGINE LIGHT IS ON - WILLIAMSBURG, VIRGINIA
Grzegorz

Grzegorz

38 years of experience
447 reviews
Grzegorz
38 years of experience
Timely service and very thorough inspection. Highly recommend.
2008 MERCEDES-BENZ C350 - CHECK ENGINE LIGHT IS ON - SAN FRANCISCO, CALIFORNIA
Jason

Jason

30 years of experience
10 reviews
Jason
30 years of experience
Outstanding Service and knowledge. He has now become 'my mechanic' as I will request him every time.
1997 LEXUS ES300 - CHECK ENGINE LIGHT IS ON - KATY, TEXAS
Chet

Chet

38 years of experience
393 reviews
Chet
38 years of experience
Explained what happened with my car and showed him a piece of metal that came off somewhere from my car. He never hooked up the diagnostic kit to get the warning codes off. My invoice shows PO300 code but my car battery was dead so I don't know if that is why the test was not performed but then how do you get the PO300 code? Then I had told him about the oil leak but the car was never jacked up or inspected underneath. He never saw the hole in the engine block, I am assuming because I have a piece of metal that is what it is from. Since nothing was actually performed on my car (except visual inspection) and he said it was not worth repairing the engine, I don't see why I was still charged $100 dollars. He was nice enough to help push the car over in the garage so I can get my other car into the garage and gave me pointers on how to buy a used car and what to look for.
2006 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

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