What the P0001 code means.

P0001 is the OBD-II generic code describing an issue with the circuit which runs from your engine computer (ECM) to your fuel pressure regulator on your fuel injection rail on your engine. The ECM regulates your fuel pressure from your fuel pump going to your engine through this circuit. When the computer detects a fault in the circuit, it will set a Check Engine Light. The code will affect fuel economy and possibly damage the engine.

What causes the P0001 code?

The fuel volume regulator code may have several causes: Disconnected plug to the fuel regulator Possible corrosion in the sensor connector Damage to the sensor wiring to the ECM Leaking fuel pressure regulator Damaged fuel pump The ECM is damaged

What are the symptoms of the P0001 code?

The P0001 code will produce a Check Engine Light on the instrument panel/dash and will likely affect: The engine’s performance during driving Possible stalling It may cause the exhaust to show smoke in various colors from black to white Fuel economy will not be efficient

How does a mechanic diagnose the P0001 code?

P0001 is properly diagnosed with a scan tool capable of sensor readings  A qualified Electrician/mechanic can read the data from the scan tool to determine   They may clear the code/light and test drive the vehicle while monitoring data to see if it returns. Based upon the conditions of the testing, possibly clearing the code and performing a road test, further diagnosis may be required. Diagnosis may require multiple electrical tools such as: An advanced scan tool to read the ECM data values A digital voltage meter with attachments A fuel pressure tester

Common mistakes when diagnosing the P0001 code Just replacing the fuel pressure regulator never guarantees a successful repair in resolving your issue. It may be caused by several components as listed above and more. Performing a visual inspection and testing the car with a scan tool, and other special equipment listed above, will verify your issue before spending money and time replacing the fuel pressure regulator unnecessarily. Electrical signals require evaluation by a scan tool and voltage meter to ensure that the fuel pressure regulator requires replacement or if another problem exists. Additional testing may be required.

How serious is the P0001 code?

The P0001 fault code could cause your vehicle from running, you may experience: Inefficient fuel economy Fuel instability which may damage your engine Potentially damage your catalytic converters, which is an expensive repair Prevent you from passing emissions

      The most common potential repairs to address the P0001 code are as follows: Connect a professional scan tool. Verify the code exists. Check for any other faults. Clear the fault code to see if it returns. Analyze data from the ECM. Road test the vehicle. Check to see if the P0001 returns. Inspect all of the items listed above. (wiring, leaks, etc) Further diagnose the problem with the equipment listed above (scan tool, voltage meter). 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 or computer.