How To Fix P0006? | Fuel Shutoff Valve Control Circuit Low
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What does the P0006 Fuel Shutoff Valve Control Circuit Low mean?
The P0006 trouble code indicates a problem with the fuel shutoff valve control circuit, specifically that the control circuit voltage is lower than the expected range.
A “circuit low” condition usually occurs when the Engine Control Module (ECM) detects insufficient voltage in the fuel shutoff valve circuit. This can prevent the valve from operating correctly, which may disrupt fuel delivery.
Common causes of a low circuit input include:
- Low battery voltage or charging system issues
- Poor or loose electrical connections
- Corroded connectors or terminals
- Damaged, shorted, or previously repaired wiring
- High resistance in the circuit
When any of these conditions are present, the ECM may not be able to properly control the fuel shutoff valve, triggering the P0006 code.
To learn how to diagnose car sensor–related issues and understand OBD-II codes, read our complete guide.
STOP GUESSING. START DIAGNOSING. SAVE HUNDREDS ON REPAIRS.
Tired of expensive repair bills and mechanics who “parts-cannon” your car without finding the real issue? The “Check Engine” light shouldn’t be a mystery. This guide puts professional-level diagnostics in your hands.
When Does the P0006 Code Trigger?
The fuel shutoff valve plays a critical role in controlling fuel delivery to the engine. It opens or closes based on commands from the Engine Control Module (ECM) to either allow or stop fuel flow, particularly during engine start-up, shutdown, or fault conditions.
The fuel shutoff valve (also called the fuel shutoff solenoid) is designed to stop fuel supply to the fuel pump when required. It is typically controlled through a relay connected to the starter circuit.
How the Fuel Shutoff Solenoid Works?
- Ignition OFF:
When the ignition is turned off, the solenoid’s spring-loaded plunger remains in the down position, blocking fuel flow to the fuel pump. - Engine Cranking (START position):
When the starter is engaged, electrical power is supplied to the fuel shutoff solenoid through the fuel shutoff relay. This energizes the solenoid and pulls the plunger upward, allowing fuel to flow to the fuel pump so the engine can start. - Engine Running (RUN position):
After the engine starts and the ignition key returns to the RUN position, a low-amperage “hold” current is applied to a secondary winding in the solenoid. This keeps the plunger in the open position, maintaining uninterrupted fuel delivery while the engine is running.
If the ECM detects a low-voltage condition in the fuel shutoff valve control circuit—such as a broken wire, poor or loose electrical connection, or a corroded connector—the valve may not open or remain open as commanded. When this occurs, the ECM sets trouble code P0006, indicating that it has detected a low input in the fuel shutoff valve control circuit.
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Where Is the Fuel Shutoff Valve Located?
The fuel shutoff valve (fuel shutoff solenoid) is typically located on or near the fuel pump, but its exact position depends on the engine type and vehicle design.
Common Locations
- Diesel engines (most common):
The fuel shutoff valve is usually mounted directly on the injection pump or high-pressure fuel pump. It controls fuel delivery into the pump and stops fuel flow when the engine is turned off. - Older mechanical diesel systems:
It is often found screwed into the injection pump housing, with an electrical connector attached to the solenoid body. - Electronic fuel systems (modern vehicles):
The shutoff valve may be:- Integrated into the high-pressure fuel pump
- Built into the fuel control module
- Located inside the fuel tank as part of the pump assembly (less common, depending on design)
Tip
Because the location varies by manufacturer and engine type, the best way to confirm the exact location is to:
- Refer to the vehicle service manual
- Look up a factory wiring or fuel system diagram
How To Fix P0006?
Troubleshooting P0006 involves several steps, and we’ll discuss each one in detail. Let’s get started!
To learn how to diagnose car sensor–related issues and understand OBD-II codes, read our complete guide.
STOP GUESSING. START DIAGNOSING. SAVE HUNDREDS ON REPAIRS.
Tired of expensive repair bills and mechanics who “parts-cannon” your car without finding the real issue? The “Check Engine” light shouldn’t be a mystery. This guide puts professional-level diagnostics in your hands.
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 P0006 code reappears.
If the code comes back, it means there’s a persistent issue that needs further troubleshooting.
Possible Root Causes of P0006
Some common root causes of the P0006 error code include:
1. Faulty Fuel Shutoff Valve (Solenoid)
Over time, oil sludge, dirt, and dust can accumulate around the camshaft position sensor — especially if there’s an oil leak or the engine hasn’t received regular oil changes.
This buildup can interfere with the sensor’s ability to accurately detect the camshaft’s position, leading to incorrect signals being sent to the ECM.
Fix: Test the fuel shutoff valve solenoid using a multimeter to check for proper resistance and continuity. If the solenoid is out of specification or shows an open circuit, replace the fuel shutoff valve.
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2. Open Circuit in the Fuel Shutoff Valve Wiring
Broken, cut, or disconnected wires between the ECM and the fuel shutoff valve can interrupt the electrical signal. An open circuit prevents the valve from receiving the required power or ground, which can trigger the P0006 code.
Fix: Carefully inspect the wiring harness and connectors for visible damage, corrosion, or loose connections.
Use a digital multimeter to test continuity in the fuel shutoff valve wiring and confirm that the circuit is intact. Repair or replace any damaged wires as necessary.
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4. Poor Electrical Connection.
Corrosion, bent pins, loose terminals, or moisture inside the connector can interrupt proper current flow to the fuel shutoff valve, making the control circuit appear open and triggering the P0006 code.
Fix: Inspect the connector carefully for bent pins, corrosion, moisture, or loose fitment.
Clean the contacts using an electrical contact cleaner and ensure the connector is securely seated. Replace the connector if damage is severe.
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5. Blown Fuse or Fusible Link
A blown fuse or a damaged fusible link that supplies power to the fuel shutoff valve or its relay can cause a loss of voltage, triggering the P0006 code.
Fix: Check the related fuses and fusible links for damage. To identify the correct fuse for the fuel shutoff valve, refer to the vehicle owner’s manual or the fuse box cover diagram. Replace any blown fuse with one of the correct rating.
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6. Faulty Fuel Shutoff Valve Relay
If the relay that supplies power to the fuel shutoff valve fails or sticks open, the valve will not receive the required voltage during engine start or operation, which can trigger the P0006 code.
Fix: Locate the fuel shutoff valve relay in the fuse/relay box and test it by swapping it with a similar known-good relay (if available). You can also test the relay using a digital multimeter to check for proper coil resistance and switching operation. Replace the relay if it fails the test.
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7. ECU Failure or Software Issues
In rare cases, an internal fault within the Powertrain Control Module (PCM) or Engine Control Module (ECM) can prevent it from properly controlling or monitoring the fuel shutoff valve circuit. When this happens, the ECM/PCM may fail to send or interpret the correct signals, resulting in the P0006 code.
Before replacing the ECU, ensure all related sensors, wiring, and connections are in good condition. If everything checks out, consider updating or reprogramming the ECU software using manufacturer tools or have it tested by a professional technician.
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