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P0002 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P0002 is an OBD-II Code that refers to the Fuel Volume Regulator Control Circuit Range/Performance

Meaning

A P0002 code is the result of the ECM (Engine Control Module) receiving a signal from your fuel pressure regulator on your fuel injection rail mounted to your engine. The ECM controls the fuel pressure from your fuel pump to your engine via this pathway and receives feedback on actual fuel pressure. When the computer detects a pressure that is not commanding the fuel pump, it sets a Check Engine Light.

Causes

Common causes for this code include:

  • Defective fuel pump
  • Corroded electrical connections in the power supply to the fuel pressure regulator
  • Faulty Fuel Pump Control Module or Power Supply to the module.
  • Fuel pressure regulator that is leaking or faulty
  • Disconnected plug to the fuel regulator
  • The ECM has been damaged.

Symptoms

The symptoms of a P0002 code are:

  • The Check Engine Light will come on indicating a problem with the system.
  • The fuel efficiency will be impacted.
  • Your exhaust's catalytic converter may suffer damage.
  • Possible black or white smoke from the exhaust.
  • Your vehicle may stall while you're driving.

Diagnosis

To diagnose a P0002 DTC code, a technician would:

1. Use a scan tool to clear all codes and test the system to see if P0002 is still present.

2. If the code is not present, check the fuel pressure to make sure it's within specification.

3. If P0002 is still present, check for corroded or loose connections in the power supply to the fuel pressure regulator

Common mistakes

The following are common mistakes when diagnosing the trouble code P0002:

It's important to know that replacing just the fuel pressure regulator will not solve your problem. It might be caused by a variety of factors listed above, as well as other components in the fuel system. 

Before spending money and time on a fuel pressure regulator replacement, perform a visual check and testing with specialized equipment to verify the problem.

To determine if the pressure regulator requires replacement, an advanced scan tool, a voltage meter, and a fuel pressure tester are required. Additional testing may be needed.

How serious is this?

A P0002 code will cause a significant impact on fuel economy.

It may affect the functionality of your engine due to an increased amount of exhaust backpressure.

Potential damage to the catalytic converter means more money spent on repairs.

May also prevent your vehicle from passing emission tests.

P0002 codes are considered serious faults with the potential for creating additional problems If ignored.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Scan with a professional tool. Confirm if the code remains.
  • Check for any additional fault codes, to figure out which codes are recurring.
  • Analyze the scan tool data produced by the ECM.
  • While studying the scan tool data from the ECM, test the car.
  • Examine everything on the list above. (leaks, pressures, voltages, etc)
  • Investigate the equipment listed above if the problem appears to be present. To figure out where the problem is, the sensor's signals must be examined. If everything looks good, look at the wiring, computer, or petrol system next.
  • Replace any faulty component, such as a fuel pressure regulator, wiring, fuel pump, or ECM.

Related codes

A P0002 is related to and may be accompanied by the following codes:

  • P0003 - Camshaft Position Sensor Circuit Malfunction
  • P0006 - Crankshaft Position Sensor A Circuit Malfunction
  • P0007 - Crankshaft Position Sensor B Circuit Malfunction
  • P0010 - Intake Valve Control Solenoid/Open Circuit 
  • P0011 - Exhaust Valve Control Solenoid/Open Circuit
  • P0012 - Intake Valve Control Solenoid/Short to Ground

How much does it cost to fix the P0002 code?

The repair cost of a P0002 code varies depending on the type of problem.

However, the average repair cost is around $150 

Replacing a faulty fuel pressure regulator can cost approximately $300.

Maintaining your fuel pressure system is important to maintaining the life of your engine.

Failure to maintain this system may result in additional issues in the future. 

How serious is this problem? Serious enough that your vehicle won't likely pass an emission test without repairing it first. If ignoring this fault code continues to allow you to operate your car, not only are you hurting the environment, you're wasting gas money and damaging vital components in the process.

Conclusion

In conclusion, the P0002 code is a trouble code that points to an issue with the fuel pressure regulator.

The solution is to check for issues with wiring, fuel pump, injectors, ECM or other components.

If no additional faults are found and the part has already been replaced, install a new one if needed. 

It's recommended to have your car thoroughly inspected by a professional mechanic so you can be sure of the real cause of this problem before replacing any parts. 

Fixing issues like these will extend the life of your engine and prevent more expensive problems in the future.

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