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DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0583

P0583Cruise Control Vacuum Control Circuit Low

P0583 means the cruise control module has detected a low-voltage condition on the vacuum control circuit, which typically supplies or regulates vacuum to the cruise control servo. The computer expects a certain voltage range on the control wire and instead sees a signal that is persistently below the acceptable threshold, indicating a short to ground, an open circuit, or a faulty component.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Cruise control fails to engage or drops out intermittently
  • Cruise control indicator light may flash or stay off when requested
  • Often no symptoms besides the warning light, with cruise seeming to work normally in some conditions
  • Erratic cruise speed surging or inability to hold a steady speed
  • Other driver aids that share the vacuum source may act up, such as HVAC vents defaulting to defrost

Common causes, most likely first

  1. Damaged or disconnected vacuum hose at the cruise control servo or vacuum pump
  2. Faulty cruise control servo or vacuum solenoid with an internal short
  3. Corroded, loose, or damaged electrical connector at the servo or control module
  4. Chafed or broken wire in the vacuum control circuit shorting to ground
  5. Failed cruise control module or body control module driver for the vacuum circuit
  6. Leaking vacuum reservoir or check valve causing the control circuit to read low

How to diagnose and fix it

  1. Inspect all vacuum hoses and connections at the servo, reservoir, and intake for cracks, disconnects, or leaks
  2. Check the electrical connector at the cruise servo for corrosion, pushed pins, or loose fit and clean or repair as needed
  3. Measure voltage on the vacuum control circuit at the servo with the key on and cruise commanded, comparing to manufacturer specification
  4. Perform a resistance check on the control wire from the module to the servo to rule out an open or short to ground
  5. Test the vacuum solenoid or servo directly with a known-good vacuum source and electrical signal to confirm operation
  6. If the circuit and servo test good, diagnose the cruise control module or body control module for a faulty driver
  7. Clear the code and road test the vehicle through several cruise engagement cycles to confirm the repair

What a low vacuum circuit really means

  • A low voltage on this circuit often comes from a simple disconnected vacuum hose rather than a failed electronic component, so always check the plumbing first.
  • The code can set intermittently due to a wire that only shorts when the engine moves under load, so a wiggle test of the harness while monitoring live data is essential.
  • Some vehicles use the same vacuum source for cruise and HVAC door actuators, so a leaking HVAC vacuum line can set P0583 without any cruise control complaint.
  • Replacing the cruise servo without checking the control circuit voltage first is a common misdiagnosis that leads to repeat failures.
  • A weak or failing vacuum pump on engines that use an auxiliary pump can cause the control circuit to read low even when all wiring and hoses appear intact.

Can I keep driving with P0583?

The vehicle remains safe to drive because the fault affects only the cruise control system, but you should avoid using cruise control until the repair is made to prevent unexpected disengagement or loss of speed control. If the check engine light is accompanied by other symptoms such as engine misfire or brake warning lights, have the vehicle inspected promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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