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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
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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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Clifton

27 years of experience
189 reviews
Clifton
27 years of experience
Arrived on time and started the job ASAP. Delightful to work with. Went out of his way to satisfy all my concerns with my car.
2002 AUDI A4 QUATTRO - CHECK ENGINE LIGHT IS ON - BOCA RATON, FLORIDA

Christopher

13 years of experience
19 reviews
Christopher
13 years of experience
Chris was really friendly. Honest and very helpful explaining what was wrong with my car. I would definitely recommend him.
2003 INFINITI G35 - CHECK ENGINE LIGHT IS ON - CITRUS HEIGHTS, CALIFORNIA

Chris

15 years of experience
202 reviews
Chris
15 years of experience
Chris is a really knowledgeable mechanic. He did a thorough maintenance inspection of my vehicle and explained everything in terms I could understand. He answered all my questions and let me know in detail the repairs that need to be done to my vehicle. He gave me a great price for the repairs and offered me his next available appt. I will definitely be booking with Chris again!
2006 CHEVROLET EQUINOX - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS

Robert

28 years of experience
500 reviews
Robert
28 years of experience
Check Engine Light. Robert was able to diagnose it to be P0135: HO2S- Heater Circuit Conditions
1999 HONDA CIVIC - CHECK ENGINE LIGHT IS ON - FREMONT, CALIFORNIA

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