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DTC codes / Chrysler codes / P1580

P1580 · ChryslerCruise Move Circuit Low Voltage

P1580 on Chrysler vehicles indicates that the powertrain control module (PCM) has detected a low voltage condition on the cruise control servo circuit, which is often called the speed control servo or cruise move circuit. The PCM monitors the voltage on the control circuit that commands the servo to move, and when that voltage falls below the expected threshold, it stores this code and usually disables cruise control operation.

SystemPowertrain
Code typeChrysler specific
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Cruise control does not engage or drops out unexpectedly while driving.
  • Cruise control indicator light may flash or stay off when the button is pressed.
  • No other drivability symptoms; the vehicle otherwise runs and drives normally.
  • Speed control buttons on the steering wheel may feel unresponsive.
  • In some cases, the check engine light (malfunction indicator lamp) illuminates.
  • The cruise control may work intermittently, especially over bumps or in wet conditions.

Common causes, most likely first

  1. Damaged or corroded wiring in the cruise control servo circuit, particularly at the servo connector or along the harness.
  2. Faulty cruise control servo (speed control servo) with an internal short or open in the move circuit.
  3. Poor electrical connection at the PCM connector for the cruise control circuit.
  4. Defective clock spring (spiral cable) in the steering wheel causing intermittent open or high resistance on the cruise switch circuit.
  5. Failed cruise control switch on the steering wheel or the switch pod.
  6. Blown fuse or faulty relay that supplies power to the cruise control system.
  7. Corrosion or water intrusion in the cruise control servo connector or harness.

How to diagnose and fix it

  1. Inspect the cruise control servo connector and wiring for corrosion, damage, or loose pins; clean and repair as needed.
  2. Check all fuses related to the cruise control system and replace any that are blown.
  3. Test the cruise control servo circuit for voltage and continuity using a multimeter, following the factory wiring diagram.
  4. Inspect the clock spring and steering wheel switches for continuity and proper resistance; replace if faulty.
  5. Check the PCM connector for tightness and corrosion; repair or replace terminals if necessary.
  6. If all wiring and components test good, substitute a known-good cruise control servo to see if the code clears.
  7. Clear the code and road test the vehicle to verify the repair; if the code returns, perform a pinpoint test with a scan tool.

Cruise Control Servo Circuit Low Voltage Tips

  • A low voltage on the cruise move circuit often results from a poor ground connection at the servo or PCM rather than a failed servo itself.
  • The clock spring is a common culprit on high-mileage Chrysler vehicles because the constant flexing of the ribbon cable can cause intermittent opens that set this code.
  • Aftermarket accessories wired into the cruise control circuit, such as alarm systems or remote starters, can introduce voltage drops that trigger P1580.
  • This code does not always mean the servo is bad; a simple chafed wire against the engine block or exhaust manifold can short the circuit to ground.
  • On some Chrysler models, a weak battery or charging system issue can cause low voltage codes across multiple modules, including the cruise control circuit.

Can I keep driving with P1580?

The vehicle is safe to drive because cruise control is disabled and the fault does not affect engine operation or safety systems. Avoid using cruise control until the repair is completed, and address the issue promptly to prevent further electrical problems.

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 Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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