P0094 Code - Fuel System Leak Detected Small Leak

What Does P0094 Mean?

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.

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What are the common causes of P0094 ?

The symptoms of code P0094 can appear suddenly, and may be dramatic in some cases. Common symptoms may include the following-

• Sudden loss of power as the engine enters limp mode
• Inability to accelerate, and the transmission may refuse to shift
• The engine may shut off unexpectedly, with the accompanying loss of power steering and vacuum assistance for the brakes
• Smoke may be visible from under the hood
• Depending on the site of the leak, engine fires may result
• The strong smell of diesel fuel may be present
• Depending on the size and site of the leak, the engine may not start.

How do you troubleshoot P0094 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0094 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

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