P0006 critical

Fuel Shutoff Valve "A" Control Circuit Low

The P0006 code means the vehicle's onboard diagnostic system has detected: Fuel Shutoff Valve "A" Control Circuit Low. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $200 - $700 (parts and labor)

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Common Symptoms

Engine stalls unexpectedly
No restart after stall
Check Engine Light on
Loss of fuel delivery

Probable Causes (Ranked by Likelihood)

Short to ground in fuel shutoff valve wiring Very High
Failed fuel shutoff valve with internal short High
Damaged wiring harness near engine components Moderate
Water intrusion in shutoff valve connector Moderate

Step-by-Step Diagnostic Procedure

Disconnect the fuel shutoff valve and check for a short to ground on the control wire
Measure solenoid resistance and compare to manufacturer spec; very low resistance indicates internal short
Inspect wiring harness for chafing against engine brackets or sharp edges
Check connector for signs of water damage or green corrosion on terminals

Frequently Asked Questions

What is the difference between P0005 and P0006?

P0005 indicates an open circuit (no electrical connection) in the fuel shutoff valve wiring. P0006 indicates a low voltage condition, typically caused by a short to ground that pulls the circuit voltage below the expected operating range.

Can water cause P0006?

Yes. Water intrusion into the fuel shutoff valve connector is a common cause, especially on trucks used in wet or snowy conditions. Corrosion from water can create a conductive path to ground.

Is P0006 a safety concern?

Yes. The fuel shutoff valve is a critical safety component. If the engine stalls due to this code while driving, you will lose power steering assist and brake assist may be limited. Pull over safely and have the vehicle towed.