Code P0006 points to the Fuel Shutoff Valve “A” Control Circuit Low. In practical terms, the computer is seeing less voltage on that control circuit than it expects. The shutoff valve is a solenoid that helps the engine management system control fuel delivery. When the signal to that solenoid is too low, the valve may not open and close as intended, and the whole fuel strategy can get out of tune. This is common in vehicles with electronic fuel injection, where small electrical issues can have big effects on drivability.
Code Symptoms
You may notice the engine stalling unexpectedly, sometimes at idle and sometimes when you come to a stop. Starting can turn into a fight, with long cranking times or starts that feel shaky until the engine finally settles. Fuel economy can also suffer, because the system isn’t managing fuel flow efficiently when the valve doesn’t respond correctly. And of course, the Check Engine light is there to let you know the computer is not happy with what it’s seeing.
Causes of the Code
The most common story is electrical, not mechanical. A weak power feed, a poor ground, corroded connectors, or damaged wiring can all pull voltage down. A short to ground or excessive resistance in the harness will do the same. The solenoid inside the Fuel Shutoff Valve can also be part of the problem if its coil is failing, drawing current in a way that drags the circuit down. Less often, the driver inside the PCM that controls the valve can be at fault, especially if the wiring and the valve check out but the command never looks right.
Code Solutions
Start with a careful visual inspection of the harness going to the Fuel Shutoff Valve. Look for rubbed insulation, melted sections near hot components, sharp bends, or connectors with green corrosion or loose terminals. Reseat the connector, clean the contacts with proper electrical cleaner, and make sure the ground points in that area are tight and free of rust. Don’t forget the basics like checking the relevant fuse and any associated relay that feeds the circuit. If you have a scan tool that can command the valve, watch how the engine responds when you actuate it and note whether the command matches the feedback the system reports.
From there, move into simple electrical tests. Verify you have proper battery voltage available on the power side of the valve with the key on, and a solid ground where you should have it. Perform a voltage drop test across the power and ground paths to catch hidden resistance that a basic continuity check can miss. If you can safely unplug the valve, measure coil resistance and compare it to the service spec for your vehicle; a reading that is far too low suggests an internal short circuit, while a very high or infinite reading points to an open coil. If the valve’s numbers look healthy and the wiring passes inspection, scope or meter the control signal to see if the PCM is actually driving the circuit. A consistently low signal with good wiring and a good valve pushes suspicion toward the PCM driver or its software.
Once you correct the root cause, clear the code with your scanner and take the car for a thorough road test. Monitor live data for fuel pressure command versus actual, watch for stable idle, and confirm that the code does not return. If it does come back after wiring and valve checks, it’s time for deeper diagnostics on the PCM, which may involve reprogramming or, in rare cases, replacement.
Explanatory video