What Codes Will This Page Cover?
Here are the codes you’ll learn about on this page:
- P0001 Fuel Volume Regulator Control Circuit/Open
- P0002 Fuel Volume Regulator Control Circuit Range/Performance
- P0003 Fuel Volume Regulator Control Circuit Low
- P0004 Fuel Volume Regulator Control Circuit High
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What Is the P0001 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
These codes refer to issues with the fuel volume regulator control circuit. They affect all fuel injection engines with a fuel pressure regulator connected to a wiring harness. The fuel pressure regulator controls the amount of fuel from the injection pump. Using a solenoid, the powertrain control module (PCM) turns the valves on and off, providing fuel injectors with enough fuel.
More about the P0001, P0002, P0003, and P0004 codes
These codes may appear similar, but they relate to different issues. Here’s how the P0001, P0002, P0003, and P0004 codes differ:
- P0001: Fuel Volume Regulator Control Circuit/Open – A problem with the fuel volume regulator control circuit that shows as “open”
- P0002: Fuel Volume Regulator Control Circuit Range/Performance – A problem with the fuel volume regulator control circuit operating outside normal parameters
- P0003: Fuel Volume Regulator Control Circuit Low – A problem with the fuel volume regulator control circuit voltage that falls below the normal range
- P0004: Fuel Volume Regulator Control Circuit High – A problem with the fuel volume regulator control circuit voltage that goes above the normal range
Fuel systems comprise many parts: the fuel tank, fuel pump, filter, lines, injectors, etc. One integral part of high-pressure fuel systems is a high-pressure fuel pump, which raises the fuel pressure for the injectors. These fuel pumps have both a low-pressure side and a high-pressure side, which are controlled by a fuel volume regulator.
What Are the Symptoms of a P0001 Code?
Despite their differences, the symptoms of codes P0001, P0002, P0003, and P0004 are all the same. Your vehicle’s engine may be unable to start, you may experience an engine stall, or your car might go into “Limp Mode” or have insufficient power. These will trigger the check engine light.
What Are Some Causes of a P0001 Code?
Some possible causes of the P0001, P0002, P0003, and P0004 codes include a defective fuel pressure regulator, bad wiring harnesses and connectors, or a faulty PCM.
How Serious Is the P0001 Code?
All of these error codes might cause your car to stall or make unusual rattling noises. Your fuel economy will be affected as well as the emissions. If ignored, then these issues will worsen over time unless the problem is quickly fixed. Negligence of these code errors will impact other parts like catalytic converters leading to failure and causing more costly repairs.
Can I Still Drive with a P0001 Code?
A vehicle presenting these codes can still be driven, but symptoms will manifest more frequently if these problems are not fixed immediately.
How Easy Is It to Diagnose a P0001 Code?
A scan tool is used to obtain sensor readings, and the data may be read by an expert mechanic to determine when the failure occurred or whether it still persists. They can clear the codes and drive the car to see if it reappears.
If additional diagnostics are required, then there are many electrical instruments that could be used for analysis, like an advanced scan tool for checking ECM data values, a digital voltage meter, and a tester that checks for fuel pressure.
How Difficult Is It to Inspect a P0001 Code?
It will be challenging to diagnose these codes without the appropriate gadgets and equipment. Amateur mechanics may make the mistake of changing the fuel pump module without looking into the wiring harness connections.
While a faulty fuel pressure regulator results in wasted gas and unacceptable emissions, simply replacing it may not be the answer. Several factors can cause the problem. A visual inspection and evaluation with specialized equipment such as a scan tool or voltage meter must first be performed before spending on a new fuel regulator.
Fixing these codes yourself will require skills and repair guides to help you correctly identify and fix your vehicle.
Need Additional Help with Your P0001 Code?
It is advisable to check and clean the fuel injection system every 20,000 to 30,000 miles. Avoid letting your fuel levels go below 1/4 of the fuel tank. A well-maintained fuel delivery system will prevent these codes from occurring.
These codes will negatively impact your fuel mileage and affect your vehicle’s performance. Get advice from qualified experts experienced in diagnosing and remedying the issue.
Use Kelley Blue Book to find a repair shop in your area. This makes fixing your car easier and more convenient, no matter what the problem may be.
If you are a DIY mechanic who wants to learn more about error codes and how to fix them, then the KBB OBD-II database provides detailed information that could help you better understand your car.
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