P0006 OBD Fault Code - Fuel Shut Off Valve Circuit Low (Causes & Fixes)

Updated: Sep 18

This is an OBD trouble code standing for "fuel shutoff valve -circuit low".

Fault Code

Fault Location

Probable Cause

P0006

Fuel shut off valve -circuit low

Wiring short to earth, fuel shut off valve


A P0006 OBD error code stands for fuel shutoff valve control circuit low, it indicates an issue with the fuel shut off solenoid or its circuit. It's typically accompanied by a poorly running engine, the check engine light and has a variety of causes.


It may potentially be linked to the P0005 or P0007 trouble codes.


If a DTC is related to the powertrain, it will begin with the letter "P" when read by an OBD reader. Fault codes in the P0xxx format are generic fault codes.

What P0006 Means

P0006 is a generic OBD code that means your engine control module (ECM) isn't getting the right signals from your fuel shut-off valve. The fuel shut-off valve is positioned on your engine's fuel delivery rail. The code may cause the engine to stall or prevent it from starting.


The fuel shut off solenoid is used to turn off the fuel pump's delivery of fuel. It's usually controlled by a relay, which is usually controlled by the starter. The spring-loaded plunger is in the down position when the ignition is turned off, limiting fuel flow to the pump.


When the starter is turned on, the cut off relay supplies electricity to the solenoid. The plunger is then raised, enabling gasoline to be delivered to the pump.


Low amperage current is delivered to another winding on the solenoid to retain it in the up position when the ignition switch is disengaged and the engine is running.


Possible Causes

Circuit low codes are often caused by low battery voltages (which may have a variety of reasons), faulty connections across electrical connectors or previously repaired wiring, and corrosion in electrical connectors are all common causes of low input codes.


Low voltages may also be caused by improper installation of aftermarket components, such as fuses, relays, and switches, as well as modifications to the electrical system, such as the use of conductors that are not rated for use in a specific application.


Poor connections, on the other hand, often result in high resistances in certain areas of the circuit, which is why resistance and continuity tests should be performed throughout the diagnostic process.


Other possible causes of this error code are as follows.


  • A faulty fuel shut off solenoid

  • A faulty fuel shut off solenoid relay

  • An issue in the fuel shut off solenoid circuit

  • An issue with the PCM


Signs & Symptoms

The error code P0006 might be accompanied with a variety of symptoms. These include a poorly running engine, a cranking engine but won't start, and an illuminated check engine light.


  • Engine may crank but won't start

  • Engine may run poorly

  • Engine may stall

  • Check engine light illumination (MIL)


Risks

It's not a serious problem, but it might cause a stall or a no-start scenario. Depending on when and where the vehicle stalls, this might be dangerous.


Diagnosing this OBD Code

An sophisticated scan tool capable of factory sensor readings (not simply one from an auto parts shop) and a voltage metre are needed to accurately diagnose P0006.


The data from the advanced scan tool may be reviewed by a competent technician to establish when the issue first started and whether it is still happening. They may clear the code and test drive the car while keeping an eye on the scan tool data to see whether the problem persists or returns.


Cutting open the protective covering, evaluating the wire harness, correcting the issue, and reinstalling the covering may be required to examine the wiring for damage.


Further diagnostic may be necessary based on the testing circumstances, probable code clearance, and a road test while monitoring the data. Multiple instruments may be required for diagnosis, such as below.


  • A sophisticated scan tool.

  • A digital voltage metre

  • To reach the sensor and wire, you'll need some basic hand tools

  • A razor blade for concealing wire harnesses


Replacing the fuel pressure shutdown valve alone does not ensure a successful repair, and it may be highly costly and time consuming. It might be caused by one or more of the components mentioned above in the electrical system and wiring.


Before replacing the fuel cutoff valve, a visual check and testing with the specific equipment indicated above can confirm your problem.


People have spent a lot of money replacing parts only to discover that the issue was a shorted wire or a broken connection. Always use a professional OBD scanner to get the most accurate diagnosis.


How to Fix a P0006 Error Code

Below is the typical procedure for troubleshooting and fixing the P0006 error code.


  1. Remove the code. This code is often set incorrectly, the first step is to clear the code, then drive the car to check whether it returns. If it doesn't after a substantial drive and restart, the issue has been resolved.

  2. Examine the shut-off solenoid and connection using a flashlight. The harness and connections are prone to a variety of issues. As a result, start with a visual inspection of the solenoid and its connection.

  3. Ensure the solenoid is working properly. Determine which pin on the solenoid connection is the power "pull" wire and which is ground by consulting the car repair manual. The solenoid should then be removed and tested for appropriate functioning by jumping it. This may be accomplished by connecting the battery with jumper wires. When power is provided, the plunger should lift up. If it doesn't, the solenoid is broken and has to be replaced.

  4. Examine the circuit. If the fuel shut-off solenoid seems to be in good working order but the P0006 code remains, the circuit and wiring must be checked.


Examining the Circuit

Two or three wires should be connected to the gasoline shutoff solenoid: pull, hold, and ground. To figure out which wire is which, see your vehicle's maintenance manual.


Connect one end of a test light to the "pull" wire pin on the fuel shutoff solenoid connection. Connect the test light clamp to the negative post of the battery. When you start the engine, the test light should come on. If it doesn't, the power supply is malfunctioning, and you'll need to study the original wiring diagram.


Next, inspect the power circuit's "hold" side. When the key is in the run position, power should only be delivered via this section of the circuit. Check for electricity at the "hold" pin of the fuel shut off solenoid connection while the engine is running.


Connect one end of a test light to the "hold" wire pin to do this. Connect the test light clamp to the negative post of the battery; the test light should light up. If it doesn't, the power supply is malfunctioning, and you'll need to study the original wiring diagram.


Disconnect the solenoid connection and touch one end of a test light to the B- pin to check for ground. Connect the test light clamp to the positive post of the battery. The test light should be turned on. If it doesn't, the ground circuit is faulty, and you'll need to study the wiring schematic.


fuel shut off solenoid wiring diagram
A fuel shut off solenoid wiring diagram (example)

Examining the Relay

If the fuel shut-off solenoid isn't receiving electricity, the relay should be checked. The simplest method to accomplish this is to replace the relay under the hood with another. The exchange is usually achievable because the same relay design is utilised on several circuits.


You know the original relay was defective if the fuel shut off solenoid works with the alternative relay inserted.


If you can't switch relays, a jumper wire may be used to test the relay. Connect the battery feed to the fuel shutoff solenoid and power using a jumper wire. If the solenoid operates, the relay is faulty.

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