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

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

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. 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
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0091 DIAGNOSTIC Get a fair and transparent estimate upfront

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.

trouble codes
Check Engine Light
P0091

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0091 code.

SCHEDULE P0091 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,606

Rating Summary
5,180
205
50
34
137
5,180
205
50
34
137

James

40 years of experience
34 reviews
James
40 years of experience
Ford F-150 - Check Engine Light is on - Chagrin Falls, Ohio
Jim was great! Arrived on time, quickly diagnosed the problem and recommended further work. Very helpful, I’ll use Jim again and recommend to family and friends.

Roberto

11 years of experience
137 reviews
Roberto
11 years of experience
Nissan Titan - Check Engine Light is on - Spring, Texas
Roberto was very thorough with his explanation of repairs needed. I will contact your mechanic for future repairs.

Matthew

32 years of experience
839 reviews
Matthew
32 years of experience
Kia Optima - Check Engine Light is on - Yorktown, Virginia
Matthew Lerman was God Sent, and thank God for Your Mechanic,, you have my Vote Looking , Looking forward for more Business. Very Honest Guy

Robert

20 years of experience
38 reviews
Robert
20 years of experience
Honda Accord - Check Engine Light is on - Brentwood, California
He came earlier than on time and got the job done faster than I seen anyone else have . Solid honest hard working dude.


More related articles

P2018 OBD-II Trouble Code: Throttle Actuator Control Module Performance
P2108 P2108 code definition Throttle actuator control module performance What the P2108 code means This trouble code indicates that the powertrain control module has detected a malfunction with the throttle body control motor or module. This code is only found...
P2453 OBD-II Trouble Code: Particulate Matter Trap Differential Pressure Sensor Signal Performance
P2453 P2453 code definition Particulate Matter Trap Differential Pressure Sensor Signal Performance What the P2453 code means This trouble code will only appear on diesel engines and it indicates that the powertrain control module has detected a voltage reading from...
P2322 OBD-II Trouble Code: Ignition Coil H Primary Control Circuit High
P2322 means there is a fault within the primary or secondary circuit of an ignition coil often due too shorted wires or an corroded oil connector.

Related questions

The car wouldn't crank, check engine light came on, bad crank position sensor

Hello. If this happened right after moving, then the computer may still need to adjust to the new elevation. The computer has an adaptive memory that must adjust to the elevation. If that is not the cause and if you...

Flashing check engine light - 2007 Ford Edge

When a Ford vehicle displays a flashing Check Engine Light on the dashboard, this is an indication that your engine has a misfire. I would first recommend having your vehicle scanned for trouble codes with an OBD-2 scanner. This will...

Check engine light on, MAF sensor code on 2004 Chevrolet Avalanche

Hey there, thanks for writing in about your 2004 Chevrolet Avalanche. The Check Engine Light code received for the MAF sensor means that a pinpoint test is required on the MAF circuit. It does not necessarily mean the sensor is...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com