Fuel and air

P0006 — Fuel Shutoff Valve "A" Control Circuit Low

Severity: medium Drive with care, to a shop

What P0006 means

The engine computer controls a fuel shutoff valve that allows fuel to flow while the engine runs and blocks it when the ignition is turned off. P0006 sets when the voltage in the control circuit for valve "A" is lower than expected. The usual causes are a failed valve, a short to ground, or damaged wiring.

Symptoms

  • Check Engine light on
  • Hard starting or no-start
  • Stalling or rough idle
  • Reduced power and poor acceleration
  • Worse fuel economy
  • Engine running on after key off (in some cases)

Possible causes

  1. Failed fuel shutoff valve "A"
  2. Damaged wiring or corroded connectors in the valve circuit
  3. Control circuit shorted to ground
  4. Internal PCM fault or software problem
  5. Low fuel pressure from a pump or regulator problem (as a related issue)

How to diagnose

  1. Read all codes and freeze frame data, clear the code, and see if it returns
  2. Inspect the valve connector and harness for chafing, heat damage, corrosion, or moisture
  3. Check power and the control signal at the valve connector using the factory wiring diagram
  4. Test the control wire for a short to ground and for an open circuit
  5. Measure the valve coil resistance and compare it to specification
  6. Check fuel pressure
  7. If wiring and valve are good, test the PCM and look for software updates

Common fixes

  • Replace the fuel shutoff valve
  • Repair the wiring or replace damaged connectors
  • Fix the short to ground in the control circuit
  • Reflash or replace the PCM (last resort)

Questions and answers

Can I drive with a P0006 code?

Only briefly and carefully. The engine may stall or fail to restart, so don't put off diagnosis.

What most often causes P0006?

A failed fuel shutoff valve or damaged wiring shorted to ground. Check the connector and harness first, then the valve itself.

Why does my engine keep running after I turn off the ignition?

If the valve doesn't shut off fuel, the engine can run on or diesel. This points to a faulty valve or its control circuit.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.