Error code P0004 is displayed and the check engine light is on - what does this mean?
The OBD system detects a fault in the fuel quantity control valve circuit, whereby the measured current value is too high. This DTC P0004 mainly affects the fuel injection system and the electronic engine control unit. For various manufacturers, this fault code may also be referred to as "Fuel Volume Regulator Control Circuit High".
What causes can this fault code have?
- Defective fuel volume control valve
- Damaged wiring to the volume control valve
- Corroded or loose plug connections
- Short circuit in the electrical cable
- Defective engine control unit (ECU)
- Overvoltage in the fuel system circuit
- Faulty fuel pump or pressure regulator
What symptoms occur in parallel with fault code P0004?
- Starting problems: The vehicle is difficult or impossible to start
- Irregular idling: Engine runs unevenly at idle speed
- Loss of power: Reduced engine power while driving
- Increased fuel consumption: Significantly higher consumption than usual
- Jerking when accelerating: Engine stutters during load changes
- Deteriorated exhaust values: Increased emission values during the emissions test
How can the problem with error code P0004 be rectified?
- The repair requires a systematic approach to identify the exact cause.
- Replace the fuel flow control valve completely and replace all seals to ensure long-lasting and reliable operation
- Completely check the wiring to the flow control valve, repair or replace damaged lines and check all connections for tightness
- Clean plug connections on the fuel system, treat with contact spray and screw tight to eliminate corrosion and loose contacts
- Have the engine control unit tested for defects and replace or reprogram if necessary, deleting all stored fault codes
- Completely check the fuel pressure system, replace the pressure regulator and fuel pump if there are any deviations and recalibrate the system
- Carry out a complete electrical measurement of the circuit, locate short circuits and replace defective cable sections
FAQ - Frequently asked questions about DTC P0004
Can I continue driving with error code P0004?
Short journeys are possible, but not recommended. The trouble code can lead to engine damage if the fuel mixture is permanently incorrectly regulated. A prompt repair is urgently recommended.
How much does it cost to repair error code P0004?
The costs vary between 150-800 euros depending on the cause. A defective flow control valve costs around 200-400 euros, while wiring repairs are cheaper. ECU defects can cost up to 1200 euros.
How long does it take to diagnose code P0004?
Fault diagnosis takes around 1-2 hours in the workshop. Depending on the component, the actual repair can take between 2-6 hours, depending on the accessibility of the components.
Can fault code P0004 be caused by bad fuel?
Yes, contaminated or low-quality fuel can damage the flow control valve and trigger this EOBD error. Regular use of branded fuel and additives can prevent this.
Is DTC P0004 a safety-critical fault?
The P0004 code is not immediately safety-critical, but can lead to a sudden loss of power. This can be dangerous during highway or overtaking maneuvers, so it should be repaired promptly.
How can I delete error code P0004 myself?
You can use an OBD scanner to clear the code temporarily, but unless the root cause is rectified it will return. A professional diagnosis is required for a permanent solution.
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