Skip the auto shop - Our mechanics make house calls

P0094 OBD-II Trouble Code: Fuel System Leak - Small Leak Detected

Check Engine Light

P0094 code definition

Fuel System Leak - Small Leak Detected

What the P0094 code means

The P0094 code is set in a vehicle’s Powertrain Control Module (PCM) when it detects a small leak in the fuel system. It is most common on vehicles with diesel engines.

What are the causes of the P0094 code?

  • Small leak in the injection pump
  • Small leak in the injectors
  • Small leak in the fuel lines and hoses
  • Small leak in the fuel rail
  • Small leak in the fuel filter
  • Small leak in the fuel tank
  • Fuel pressure decreased by the fuel pump, injector pump, a restriction in the fuel system, or a fuel pressure regulator

What are the symptoms of the P0094 code?

  • Running out of fuel faster than normal
  • Decreased fuel economy
  • Check Engine Light illumination
  • Fuel odors
  • Risk of fire

How does a mechanic diagnose the P0094 code?

  • Inspects the fuel system for leaks

  • Repairs any leaks found

If no leaks are found in the fuel system:

  • Conducts a fuel pressure test

If fuel pressure is lower than manufacturer-specified pressure:

  • Inspects the fuel pump
  • Inspects the injector pump
  • Inspects the fuel pressure regulator

Common mistakes when diagnosing the P0094 code

Checking for leaks and, after not finding any leaks, replacing the fuel pressure regulator. This part is a common cause of this issue, however is is always best to know for sure that a part is faulty by testing it before replacing anything.

How serious is the P0094 code?

The P0094 code is not as serious as a P0093 code, due to the fact that the leak is smaller. However, considering that a fuel leak is still possible, the risk of a fire is also possible, which can become a very serious safety issue and could cause injury to the driver and passengers.

What repairs can fix the P0094 code?

Additional comments regarding the P0094 code

Just because this code says that a “small leak” has been detected in the fuel system does not mean that a leak actually exists. This code is set when the PCM sees a noticeable loss in fuel pressure. If the fuel pressure sensor or its circuitry are damaged, or the fuel pressure regulator, fuel pump, or fuel filter are faulty, this can cause a decrease in fuel pressure and therefore cause a P0094 code.

Need help with a P0094 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 to have this issue resolved.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: Not able to start - 2006 VW Mark 5

Hi there: The P1095 ODB-II trouble code indicates that the O2 sensor signal circuit is slow switching from lean to rich (Bank 1 Sensor 1). When this occurs, it can cause your vehicle to stall rather quickly. However, before you...

Q: How do I replace the airflow sensor on my 1985 olds 98

You definitely want to reset the computer when you make a repair like this. Resetting the computer will allow it to check the new component for proper operation and set a Diagnostic Trouble Code if there is still a problem....

Q: Gas tank door burnt black.

The most common cause for a P0440 code is the fuel cap seal. I suggest making sure that the fuel cap is tight by turning until it clicks. If you are sure that your fuel cap was tight, replace the...