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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.
Fuel Pressure Regulator 1 Control Circuit Low
P0091 means that the Powertrain Control Module (PCM) has detected fuel pressure that is outside the specification set by the manufacturer.
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
A mechanic may start with a good visual inspection of the fuel system, including:
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.
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.
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.
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.