Auto Troubleshooting
OBD II Codes (P0000 - P0099) | P0002 “Fuel Volume Regulator Control Circuit Range/Performance”
Meaning:
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.
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.
causes:
The fuel volume regulator range/performance code may have several causes:
Circuit problems, such as damaged wires and poor connections
PCM issues (software in need of an update)
Disconnected plug to the fuel regulator
Possible corrosion in the sensor connector
Damage to the sensor wiring to the ECM
Leaking or defective fuel pressure regulator
Damaged fuel pump
Symptoms:
The P0002 code will produce a Check Engine Light on the instrument panel/dash and will likely affect:
Check Engine light is illuminated
Poor engine performance
Engine stalling
Reduced fuel mileage
Vehicle won’t start
The P0002 fault code could cause your vehicle from running and will:
Effect caused:
Affect fuel economy
Cause fuel instability which may cause damage to your engine
Potentially damage your catalytic converters (which is an expensive repair)
Prevent your vehicle from passing emissions
Diagnosis:
P0002 is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.
Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple tools such as:
Affect fuel economy
Cause fuel instability which may cause damage to your engine
Potentially damage your catalytic converters (which is an expensive repair)
Prevent your vehicle from passing emissions
Solution:
P0002 is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.
Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple tools such as:
• Connect a professional scan tool. Verify the code exists.
• Check for any other fault codes. Clear the fault codes to see which codes return.
• Analyze scan tool data from the ECM.
• Road test the vehicle while analyzing the scan tool data from the ECM.
• Check to see if the P0002 code returns.
• Inspect all the items listed above. (wiring, leaks, pressures, voltages, etc.)
• Further diagnose the problem with the equipment listed above if the problem appears to be present. The signals from the sensor need to be analyzed to determine where the problem exists. If the signals are fine, then we need to move towards the wiring, computer, or fuel system.
• Replace the fuel pressure regulator, wiring, fuel pump, or ECM (requires programming) whichever is faulty.