How To Fix P0001? | Fuel Volume Regulator Control Circuit/Open
What does the P0001 Fuel Volume Regulator Control Circuit/Open mean?
The “P” prefix in the code denotes that it’s related to a powertrain issue. The P0001 code is a generic powertrain code indicating a problem with the fuel volume regulator control circuit. The fuel volume regulator is tasked with regulating the fuel pressure and flow within the fuel system.
When the error code P0001 is triggered, it signifies an issue with the fuel volume regulator control, and specifically, an open circuit. This means that the sensor or component is not receiving the necessary reference voltage required for proper functioning.
When the P0001 Triggers?
On common rail (gasoline direct injection or common rail diesel) fuel injection systems, the pressure needed by the fuel injector comes from an engine-driven injection pump. The Fuel Volume Control Valve (FVCV) plays a critical role in this system by regulating the volume of fuel delivered by the injection pump to meet engine load condition.
The fuel volume regulation operates in a closed-loop system that involves a fuel pressure sensor, Engine Control Module (ECM), and injectors.
The ECM uses the feedback from the fuel pressure sensor and data from other sensors (such as the mass air flow sensor, intake air temperature sensor, and throttle position sensor) to calculate the required amount of fuel.
Fuel volume regulator Controlled by a solenoid, the PCM can turn the valves on and off, allowing fuel injectors to get enough fuel. If ECU detects either Fuel volume regulator control circuit or the solenoid is open, it’ll throw code P0001.
How To Fix P0001?
Troubleshooting P0001 involves several steps, and we’ll discuss each one in detail. Let’s get started!
Before diving into specific repairs, perform an OBD-II scanner reset to clear the codes. Sometimes, these codes pop up due to recent maintenance work and can resolve themselves after a reset.
To reset the error codes, use an OBD-II scanner. Simply connect the scanner to your vehicle, follow the instructions to clear the trouble codes, and see if the P0001 code reappears.
If the code comes back, it means there’s a persistent issue that needs further troubleshooting.
Step #1 – Scan for any other activated OBD-II codes.
The first step is to scan for any other activated OBD-II codes. This helps us pinpoint where we need to focus. If there are other codes related to a faulty camshaft sensor, we should focus on the camshaft sensor. Similarly, if there are codes related to the crankshaft sensor, that’s where our attention should go.
Step #2 – Visually Inspect Cam and Crank Sensors
Visually inspect the cam and crank sensors and their harnesses for damage. Look for broken or frayed wires. If you find any, repair them and recheck. If the crank and cam sensors are physically damaged, they need to be replaced. If both the crank and cam sensors, along with their harnesses, are in good condition but the P0016 code still persists, further troubleshooting is required.
Step #3 – Test Crank and Cam Sensors
You can test the crank and cam sensors using a multimeter. However, the testing method varies depending on whether you have a Hall Effect sensor or a permanent magnetic sensor.
If both the crank and cam sensors test okay, it’s time to move on to the next step.
If both the crank and cam sensors test okay, it’s time to move on to the next step.
Step #4 – Visually Inspect Timing Belt or Chain
What ties the camshaft and crankshaft together is the timing belt or chain. Check that the belt or chain isn’t stretched. Also, check for a damaged tensioner that may have allowed the chain or belt to slip a tooth or several teeth.
If everything with the timing belt or chain looks okay and there’s no sign of stretching or damage, we need to move to the next step.
Step #5 – Check Tone Ring
The last suspect is the tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment. Make sure they’re not loose or damaged, and check that they haven’t sheared the key that aligns them.
If the tone rings are misaligned, damaged, or have a sheared key, they need to be fixed or replaced to fix P0016
