P0006 Code- Fuel Shutoff Valve 'A' Control Circuit Low

What Does Code P0006 Mean

P0006 is a generic OBD-II code indicating an issue with the engine control module (ECM) not receiving correct signals from your fuel shut-off valve. The fuel shut-off valve is located at the fuel supply rail mounted to your engine.

The ECM uses the fuel shut-off valve to prevent fuel from entering the engine when you turn it off. By doing this, the valve prevents your engine from continuing to run after you turn the key off (a term we call “dieseling”). The code will possibly cause dieseling or prevent the engine from starting. The Check Engine Light will also turn on.

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Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

Possible causes

• Faulty Fuel Shutoff Valve 'A'
• Fuel Shutoff Valve 'A' harness is open or shorted
• Fuel Shutoff Valve 'A' circuit poor electrical connection

Troubleshooting P0006

• Clear the code

This code is often set in error. The first thing to do is clear the code, drive the vehicle and see if it returns. If it does not, the problem is solved.

• Perform a visual inspection of the shut off solenoid and connector

Many problems can easily be found in the harness and connectors. So, begin your diagnosis by visually inspecting the solenoid and its connection.

• Check solenoid operation

Consult the vehicle repair manual to determine which pin on solenoid connector is the power “pull” wire and which is ground. Then, remove the solenoid and check for proper operation by jumping it. This can be done by attaching jumper wires to the battery or by using a Power Probe (http://www.powerprobe.com/IV/). The plunger should pull up when power is applied. If it does not, the solenoid is faulty and should be replaced.

• Check the circuit

If the fuel shut off solenoid checks out OK, but you still have P0006 code illuminated, you’ll need to check the circuit.

An example of a fuel shut off solenoid wiring diagram
(Courtesy: ALLDATA)

The fuel shut off solenoid should have two or three wires going to it: pull, hold and ground. Consult the repair manual for your vehicle to determine which wire is which.

Disconnect the fuel shut off solenoid connector and touch one end of a test light to the “pull” wire pin. Connect the test light clamp to the battery negative post. Crank the engine; the test light should illuminate. If it does not, there is problem in the power supply and you will need to consult the factory wiring diagram.

Next, check the “hold” side of the power circuit. Power should only be supplied through this portion of the circuit when the key is in the run position. With the engine running, check for power at the “hold” pin of the fuel shut off solenoid connector. To do this, touch one end of a test light to the “hold” wire pin. Connect the test light clamp to the battery negative post; the test light should illuminate. If it does not, there is problem in the power supply and you will need to consult the factory wiring diagram.

To check for ground, disconnect the solenoid connector and touch one end of a test light to the B- pin. Connect the test light clamp to the battery positive post. The test light should illuminate. If it does not, there is problem in the ground circuit and you will need to consult the factory wiring diagram.

• Check the relay

If power is not getting to the fuel shut off solenoid, you’ll want to check the relay. The easiest way to do this is by swapping the relay with another under the hood. Usually the same relay design will be used on multiple circuits, making the swap possible. If the fuel shut off solenoid works with the alternate relay installed, you know the original relay was bad.

If you are unable to swap relays you can use a jumper wire to test the relay. Connect a jumper wire or paperclip between the battery feed to the fuel shut off solenoid and power. If the solenoid works, the relay is defective.

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