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Modern vehicles are equipped with on-board diagnostic (OBD) systems that alert drivers when something is wrong with their vehicle. To start the process of identifying what problem may have triggered your Check Engine Light (or other warning lights in your instrument panel), you’ll need to connect your vehicle to an OBD scan tool and retrieve the specific trouble code. 

One rare, yet possible, OBD code that you may encounter is the P0002 code. To help you understand what this means for your vehicle, here is some basic information about this trouble code.

general mechanic obd
To start the process of identifying what problem may have triggered your check engine light, you’ll need to connect your vehicle to an OBD scan tool and retrieve the specific trouble code. 

What Does the P0002 Code Mean?

The P0002 code is defined as Fuel Volume Regulator Control Circuit Range/Performance.

Your vehicle’s fuel delivery system consists of several components. These include the fuel tank, fuel pump(s), filter, fuel lines, fuel injectors, and more. High fuel pressure from the fuel pump to the fuel rails is needed for the fuel injectors to operate. 

On some vehicles (diesels in particular) the powertrain control module or PCM controls the increase or decrease of fuel volume within the system by activating the fuel volume regulator (also known as the fuel volume control valve). This valve controls fuel delivery to the high pressure pump.

fuel pressure regulator 3
The fuel volume control valve controls fuel delivery to the high pressure pump.

The PCM regulates fuel volume and pressure by controlling the on/off time of the fuel volume control valve solenoid. This controls the flow of low-pressure fuel into the one-way check valve and three main pump pistons.

The P0002 code is set by the PCM whenever it perceives a problem with the fuel volume regulator (fuel volume control valve) or its circuit. Unlike other common codes, it’s rare for vehicles to get a P0002 code.

It can be associated with similar codes such as codes P0001, P0003, or P0004.

P0002 is a common issue among the following makes: Mercedes Benz (especially on a Mercedes Benz C250), and Ford.

Note: The definition of code P0002 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0002 Code?

  • Failed fuel volume regulator
  • Circuit problems, such as damaged wires and poor connections 
  • PCM issues (software in need of an update)

What are the Common Symptoms of the P0002 Code?

  • Check Engine light is illuminated
  • Poor engine performance
  • Engine stalling
  • Reduced fuel mileage
  • Vehicle won’t start 

How to Diagnose the P0002 Code

Identifying the underlying cause of the P0002 code can be difficult, especially if you’re not confident with your automotive knowledge. In most cases, it would be best to bring your vehicle to an auto repair shop and seek the help of a professional for an accurate diagnosis.

Here is a video that can help give you a better idea on how this trouble code might be diagnosed:

How to Fix the P0002 Code

The P002 code is a generic trouble code that may apply to various makes and models. While vehicles from different manufacturers may share common symptoms, the steps for diagnosis and repair for a P0002 Ford code may differ from a P0002 Chevy code.

If you’re an advanced DIYer who’d like to fix this code on your own, it will be helpful to refer to your repair manual or get factory vehicle repair information from an online subscription service.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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