P0006 Code – Fuel Shutoff Valve "A" Control Circuit High

The P0006 diagnostic trouble code (DTC) indicates that the engine control module (ECM) has detected a higher-than-expected voltage in the Fuel Shutoff Valve "A" Control Circuit. This code is most commonly found on diesel engines equipped with electronically controlled fuel systems, although some gasoline direct injection systems may also trigger it.

What Does P0006 Mean?

P0006 means the ECM has identified an electrical problem where the control circuit voltage for the fuel shutoff valve is above the manufacturer's specified range. This may prevent the valve from operating correctly, affecting fuel delivery and engine performance.

Symptoms of P0006

• Check Engine Light illuminated.
• Hard starting or no-start condition.
• Engine stalls unexpectedly.
• Reduced engine power.
• Poor fuel economy.
• Rough idle or unstable engine operation.

Common Causes

• Faulty fuel shutoff valve.
• Open or shorted wiring in the control circuit.
• Corroded or loose electrical connectors.
• High resistance in the wiring harness.
• Blown fuse or relay issue.
• Defective ECM (rare).

How to Diagnose P0006

1. Scan the vehicle for additional DTCs.
2. Inspect the wiring harness for damage or corrosion.
3. Check all connectors for loose pins or moisture.
4. Measure the control circuit voltage using a multimeter.
5. Test the fuel shutoff valve resistance according to manufacturer specifications.
6. Verify ECM output if all other components test good.

How to Fix P0006

• Repair or replace damaged wiring.
• Clean or replace corroded electrical connectors.
• Replace a faulty fuel shutoff valve.
• Repair blown fuse or faulty relay if applicable.
• Update or replace the ECM if it is confirmed defective.

Can You Drive With P0006?

Driving with a P0006 code is not recommended. Since the fuel shutoff valve controls fuel flow, a malfunction can cause the engine to stall or fail to start. The vehicle may become unreliable and could leave you stranded.

Repair Cost Estimate

Repair	Estimated Cost (USD)
Wiring repair	$50–$250
Fuel shutoff valve replacement	$150–$500
Fuse or relay replacement	$10–$80
ECM replacement/programming	$500–$2,000

Related Trouble Codes

• P0004 – Fuel Volume Regulator Control Circuit High
• P0005 – Fuel Shutoff Valve "A" Control Circuit/Open
• P0007 – Fuel Shutoff Valve "A" Control Circuit Low

Frequently Asked Questions

What does code P0006 mean?

It indicates that the ECM has detected excessively high voltage in the fuel shutoff valve control circuit.

Can a bad battery cause P0006?

It is uncommon, but unstable system voltage or electrical faults may contribute to the code.

Will clearing the code fix the problem?

No. Clearing the code only removes it temporarily. If the underlying fault remains, the code will return.

Conclusion

P0006 is an electrical fault related to the fuel shutoff valve control circuit. Diagnosing the wiring, connectors, valve, and ECM in a systematic manner will usually identify the root cause. Repairing the issue promptly helps restore reliable engine operation and prevents unexpected stalling or starting problems.