P0007: Fuel Shutoff Valve Control Circuit High

What it means

Control voltage of fuel shutoff valve A is above the expected range, typically caused by a short to power or open ground return.

At a glance

• Usually lights the check-engine light

How it works

Fuel shutoff valve A is a solenoid that controls fuel flow, commonly on diesel engines. P0007 sets when the control module detects circuit voltage above its expected range, which can result from a wire shorted to power or an open ground return.

Common causes

Most likely first.

1. Wiring shorted to battery voltage
2. Open ground return path
3. Connector pins corroded - high contact resistance

Symptoms

• Check engine light on
• Hard starting or no start
• Engine may stall or run poorly
• Reduced power

How to diagnose it

1. Review freeze-frame data and live valve command status to see whether the high-circuit reading occurred during starting, running, or shutdown.
2. Inspect shutoff valve A's connector and harness for corrosion, loose or backed-out pins, chafing, and contact with a powered wire.
3. With the circuit isolated as specified by the manufacturer, check the valve wiring for a short to power and verify the ground return's continuity.
4. Measure voltage at the valve and control module terminals during a commanded test, comparing readings with the manufacturer's specification.
5. If the circuit checks pass, test shutoff valve A's coil and operation for an internal fault.

Common fixes

• Clean and secure corroded or loose shutoff valve A connector terminals.
• Repair wiring shorted to power or restore the open ground return.
• Replace damaged connector pins or harness sections.
• Replace shutoff valve A if its electrical or operating tests fail.

Can I keep driving?

The engine may start poorly, stall, or lose power, and it may not shut off as expected. Avoid driving if operation is unreliable; stop safely if the engine stalls or cannot be shut down normally.