Fuel Shutoff Valve A Control Circuit Low
The Powertrain Control Module (PCM) has detected that the voltage in the control circuit for the fuel shutoff valve 'A' is lower than the manufacturer's specified range. This typically indicates a short to ground in the wiring or a failure within the valve's internal solenoid.
This code is highly urgent because a malfunctioning fuel shutoff valve can prevent the engine from starting or cause it to stall unexpectedly while driving. Immediate diagnosis is required to restore reliable vehicle operation.
Common symptoms
- Illuminated Check Engine Light
- Engine cranks but will not start
- Engine stalls unexpectedly while driving
- Noticeable lack of engine power or hesitation
- Vehicle enters limp-home mode
Likely causes
- Short to ground in the fuel shutoff valve wiring harness
- Corroded or loose electrical connector at the fuel shutoff valve
- Faulty fuel shutoff valve (internal solenoid failure)
- Blown fuse or faulty relay providing power to the valve circuit
- Faulty Powertrain Control Module (PCM)
What to check before replacing parts
Inspect the wiring harness and connectors for the fuel shutoff valve.
Look for: Look for chafed wires, exposed copper touching the chassis (short to ground), or severe corrosion inside the connector pins.
Check the fuses and relays associated with the fuel system and shutoff valve.
Look for: A blown fuse or a relay that fails to click and provide continuity when energized indicates a power supply issue.
Measure the resistance of the fuel shutoff valve solenoid using a multimeter.
Look for: Compare the resistance reading to the manufacturer's specification; an out-of-limits or near-zero reading indicates an internal short in the valve.
Test for voltage at the fuel shutoff valve connector with the key on.
Look for: A reading of zero or significantly lower than battery voltage indicates a wiring issue or short to ground between the PCM/relay and the valve.
Perform a continuity test on the control wire between the valve connector and the PCM.
Look for: Continuity to ground when both ends are disconnected confirms a short to ground in the wiring harness.
This page explains the generic P0006 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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