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P0006 Code Explained: Fuel Shutoff Valve “A” Control Circuit Low Causes, Symptoms & Fixes

An OBD-II scanner displaying P0006 next to a diesel fuel shutoff valve, wiring harness, battery, and multimeter showing a low-voltage control circuit diagnosis.

If your OBD-II scanner displays P0006, your vehicle’s Engine Control Module (ECM) has detected that the Fuel Shutoff Valve “A” control circuit voltage is lower than expected. This code is most commonly found on diesel engines with electronically controlled fuel shutoff valves, although some gasoline direct-injection (GDI) systems may also set it.

Unlike P0005, which indicates an open circuit, P0006 means the ECM is still detecting the valve electrically—but the control circuit voltage has dropped below the acceptable operating range. Low voltage prevents the Fuel Shutoff Valve from operating correctly, potentially restricting fuel flow and causing serious drivability problems.

This guide explains what P0006 means, the symptoms you may experience, the most common causes, diagnostic procedures, repair costs, and how to prevent the code from returning.

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Quick Facts

ItemInformation
OBD-II CodeP0006
DescriptionFuel Shutoff Valve “A” Control Circuit Low
CategoryPowertrain
SystemFuel Delivery System
Severity★★★★☆ High
Safe to Drive?Only if drivability is unaffected
Common CausesShort to ground, failed shutoff valve, damaged wiring, weak battery, poor ground
Typical Repair Cost$100–$1,500

What Does P0006 Mean?

P0006 stands for:

Fuel Shutoff Valve “A” Control Circuit Low

The Fuel Shutoff Valve regulates fuel flow by opening or closing based on commands from the Engine Control Module. The ECM continuously monitors the electrical voltage in the valve’s control circuit.

If the ECM detects lower-than-expected voltage, it stores P0006.

Unlike:

P0006 specifically indicates the circuit is receiving insufficient voltage, preventing the valve from operating correctly.

Common reasons include:

Symptoms of P0006

Depending on the vehicle, symptoms may include:

Diesel engines are particularly sensitive because the shutoff valve directly controls fuel delivery.

Common Causes

Failed Fuel Shutoff Valve

An internally shorted or partially failed solenoid can reduce circuit voltage enough to trigger P0006.

Short to Ground

One of the most common causes.

Inspect for:

Corroded Connector

Moisture intrusion can create excessive resistance.

Inspect for:

Weak Battery

Low system voltage frequently contributes to P0006.

Test:

before replacing components.

Charging System Problems

A failing alternator or voltage regulator may reduce voltage supplied to the shutoff valve.

Charging voltage should generally remain between 13.5 and 14.8 volts.

Damaged Wiring Harness

Heat and vibration can eventually damage engine wiring.

Inspect areas near:

Poor Ground Connection

High resistance in ground circuits can lower operating voltage.

Inspect:

Faulty ECM Driver

Rarely, the ECM output driver may fail and produce insufficient voltage.

Confirm every external circuit before suspecting the ECM.

How Serious Is P0006?

High.

Because the Fuel Shutoff Valve directly affects fuel delivery, P0006 can lead to:

Ignoring the problem may leave the vehicle unable to start.

Can You Drive With P0006?

Only if the engine operates normally.

If you notice:

the vehicle should be repaired as soon as possible.

Driving with unstable fuel delivery can create additional fuel system problems.

How to Diagnose P0006

1. Scan for Additional Codes

Look for related codes including:

These may help narrow the diagnosis.

2. Inspect the Wiring

Look for:

Repair any damaged wiring before replacing components.

3. Inspect the Connector

Disconnect the valve connector and inspect for:

4. Measure Circuit Voltage

Using a digital multimeter:

Low voltage confirms the circuit fault.

5. Test Valve Resistance

Disconnect the Fuel Shutoff Valve and measure internal coil resistance.

Values outside specifications generally indicate valve failure.

6. Test Battery and Charging System

Verify:

Electrical supply problems commonly trigger P0006.

7. Verify ECM Operation

After all wiring and components pass testing, verify ECM control output using a scan tool or oscilloscope.

Common Repairs

RepairEstimated Cost
Replace Fuel Shutoff Valve$250–700
Repair wiring harness$100–450
Replace connector$75–250
Replace battery$150–350
Replace alternator$400–900
Repair ground connection$50–200
Replace ECM (rare)$900–2,000

Common Diagnostic Mistakes

Technicians often:

Proper electrical diagnosis usually identifies the problem quickly.

Vehicles Commonly Affected

P0006 is commonly reported on:

Certain gasoline direct-injection engines may also set P0006 depending on fuel system design.

How to Prevent P0006

Reduce the likelihood of P0006 by:

Frequently Asked Questions

What does P0006 mean?

P0006 indicates the Engine Control Module has detected low voltage in the Fuel Shutoff Valve “A” control circuit.

Is P0006 serious?

Yes.

The valve controls fuel delivery, so insufficient voltage can lead to poor engine performance, stalling, or a no-start condition.

Can a weak battery cause P0006?

Absolutely.

Low battery voltage and charging system failures are common contributors to this code.

Can damaged wiring trigger P0006?

Yes.

Shorts to ground, damaged insulation, and corroded connectors are among the most common causes.

Will clearing the code fix P0006?

No.

The code will return until the underlying electrical fault has been repaired.

Final Thoughts

The P0006 code indicates that the Fuel Shutoff Valve “A” control circuit is receiving less voltage than required for proper operation. Whether caused by damaged wiring, poor electrical connections, a failing shutoff valve, or a weak charging system, diagnosing the electrical circuit thoroughly before replacing components can save both time and money.

Prompt repairs will restore proper fuel delivery, improve engine reliability, and help prevent more expensive fuel system failures.

For additional diagnostic guides, browse our complete OBD-II libraries:

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