FixItFor.Us
P codepowertrainLow severity

P0583Cruise Control Vacuum Control Circuit Low

The cruise control vacuum apply solenoid circuit is reading a lower voltage than expected, usually from a short to ground, and the module has shut the cruise system down.

Definition

The control module monitors the driver circuit for the vacuum control solenoid in a vacuum-operated cruise servo and expects the circuit voltage to toggle with its commands. P0583 sets when the circuit stays low when it should be high, which typically indicates a short to ground in the harness or a shorted solenoid winding. Because an uncommanded grounded circuit could hold the solenoid energized, the module disables cruise operation, often by dropping the cruise enable relay, as soon as the fault is detected. Cruise will not engage, but there is no effect on normal engine driveability and the MIL generally stays off.

Common causes

  • Control wire to the vacuum solenoid chafed through and shorted to ground
  • Internally shorted vacuum control solenoid winding (below-spec resistance)
  • Water intrusion or corrosion inside the servo connector bridging a terminal to ground
  • Harness pinched at a bracket or engine mount near the servo
  • Failed driver transistor in the cruise or engine control module

Common misdiagnoses

  • Servo assembly replaced when a pinched harness section is the real short
  • Cruise control module replaced before the harness is tested for a short to ground
  • Brake switch replaced because cruise refuses to engage
  • Cruise fuse repeatedly replaced without finding the underlying short

Troubleshooting steps

  1. 1.Measure solenoid winding resistance

    Compare the vacuum solenoid's resistance to specification (commonly 20-60 ohms); a reading of only a few ohms indicates a shorted winding pulling the circuit low.

  2. 2.Test the control wire for a short to ground

    With the servo and module disconnected, check resistance from the control wire to chassis ground; anything other than OL means the harness is shorted.

  3. 3.Inspect the harness routing

    Trace the servo harness for chafe points at brackets, the battery tray, and engine movement areas where insulation commonly wears through.

  4. 4.Check the connector for contamination

    Look for coolant, water, or green corrosion inside the servo connector that can create a resistive path to ground.

  5. 5.Monitor circuit voltage while commanding the solenoid

    Back-probe the control circuit with a scan tool output test running; the voltage should switch cleanly instead of sitting near 0 volts.

Related codes