P0004 Code - Fuel Volume Regulator Control Circuit High
Quick Answer
This fault code is stored in the engine control module when the system cannot correctly control the fuel pressure. Common causes include Faulty Fuel Volume Regulator (FVR) Control Valve, Fuel Volume Regulator Control Valve harness is open or shorted, Fuel Volume Regulator Control Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0004 indicates Fuel Volume Regulator Control Circuit High.
- Common causes
- Common causes include Faulty Fuel Volume Regulator (FVR) Control Valve, Fuel Volume Regulator Control Valve harness is open or shorted, Fuel Volume Regulator Control Valve circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0004 Description
Normally manufacturers will support data parameters for actual and desired fuel pressure.
A number of issues may cause this fault code to be set such as a faulty fuel rail pressure sensor, a mechanical fault with the fuel volume regulator could cause the valve to become stuck. An electrical fault such as an open circuit in the fuel volume regulator on a system with a normally closed valve will also cause this situation. A short circuit on the control wire of a normally open fuel volume regulator will also cause this fault.
A fault in the fuel injector return system will cause the fuel pressure to be lower than expected. This causes fuel from the high-pressure circuit to be leaked back to the low-pressure circuit. A faulty maximum pressure relief valve will also cause this situation.
The high-pressure pump should also be tested to ensure it is capable of delivering the required volume of fuel.
What are the Possible Causes of the DTC P0004?
- Faulty Fuel Volume Regulator (FVR) Control Valve
- Fuel Volume Regulator Control Valve harness is open or shorted
- Fuel Volume Regulator Control Valve circuit poor electrical connection
How to Fix the DTC P0004?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0004 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0004 code?
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Information for Specific Makes
- P0004 Ford — Fuel Volume Regulator Control Circuit High
Frequently Asked Questions about P0004 Code
1. What are common symptoms of OBDII code P0004?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the Check Engine Light.
2. What causes OBDII code P0004 to trigger?
- OBDII code P0004 is triggered when the fuel volume regulator control circuit is detecting a high voltage or resistance, indicating a potential issue with the fuel system.
3. How can I diagnose the cause of OBDII code P0004?
- Diagnosing OBDII code P0004 typically involves checking the wiring and connections related to the fuel volume regulator control circuit, as well as testing the regulator itself for proper functioning.
4. Can a faulty fuel pump cause OBDII code P0004?
- Yes, a faulty fuel pump can potentially cause OBDII code P0004 to trigger, as it can affect the fuel volume regulator control circuit's performance.
5. Are there any simple repair tips for fixing OBDII code P0004?
- Simple repair tips for addressing OBDII code P0004 include checking and cleaning the electrical connections, ensuring proper fuel pressure, and replacing a malfunctioning fuel volume regulator if needed.
6. Is it safe to continue driving with OBDII code P0004 present?
- It is generally not recommended to continue driving with OBDII code P0004 present, as it can lead to further damage to the fuel system and negatively impact the vehicle's performance and fuel efficiency.
7. How much does it typically cost to repair OBDII code P0004?
- The cost of repairing OBDII code P0004 can vary depending on the underlying cause, but it may range from $100 to $500, including parts and labor.
8. Can OBDII code P0004 be reset without fixing the underlying issue?
- While clearing the code can temporarily turn off the Check Engine Light, it is important to address the root cause of OBDII code P0004 to prevent further problems with the fuel system.
9. Are there any preventative measures to avoid OBDII code P0004?
- Regular maintenance of the fuel system, including checking fuel pressure and ensuring proper fuel quality, can help prevent issues that may trigger OBDII code P0004.
10. Does OBDII code P0004 affect vehicle safety?
- While OBDII code P0004 does not directly impact vehicle safety, it can lead to decreased performance and fuel efficiency, which may affect the overall driving experience and potentially cause further issues if left unresolved.
Discuss the causes and fixes for P0004 OBDII Code
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Please double check the code number, there is no information about the P0004 in the 2008 Infiniti G35 factory service manual. Infiniti doesn't use the P0004 code.
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