Cruise Control Multi-Function Input "A" Circuit Low
Code P0580 indicates the cruise control multifunction input circuit A is detecting a low voltage signal. This typically affects the cruise control system's ability to receive commands from the steering wheel control switches or related input device.
What You Might Notice
- Cruise control does not engage or function
- Cruise control light remains illuminated continuously
- Inability to set cruise control to desired speed
- Abnormal or erratic vehicle speeds when cruise control is active
- Cruise control buttons unresponsive on steering wheel
Most Common Causes
- 1
Faulty cruise control switch
The steering wheel-mounted cruise control switch may be failing or producing an incorrect low voltage signal. This is the most common cause of P0580.
- 2
Damaged or corroded wiring harness
The wiring between the cruise control switch and the engine control module may have corrosion, cuts, or loose connections causing voltage to drop below acceptable levels.
- 3
Defective cruise control module or connector
The cruise control module itself or its electrical connectors may be damaged, corroded, or improperly seated, preventing proper signal reception.
- 4
Engine control module (ECM) malfunction
In rare cases, the ECM's input circuit for the cruise control signal may be faulty, though this is less common than switch or wiring issues.
How to Diagnose It
- 1
Check Faulty cruise control switch — The steering wheel-mounted cruise control switch may be failing or producing an incorrect low voltage signal. This is the most common cause of P0580.
- 2
Check Damaged or corroded wiring harness — The wiring between the cruise control switch and the engine control module may have corrosion, cuts, or loose connections causing voltage to drop below acceptable levels.
- 3
Check Defective cruise control module or connector — The cruise control module itself or its electrical connectors may be damaged, corroded, or improperly seated, preventing proper signal reception.
- 4
Check Engine control module (ECM) malfunction — In rare cases, the ECM's input circuit for the cruise control signal may be faulty, though this is less common than switch or wiring issues.
How to Fix It
- 1
Replace cruise control switch
Remove the steering wheel trim and access the cruise control switch assembly. Test the switch with a multimeter to confirm it is faulty, then replace with a new OEM-equivalent switch.
- 2
Inspect and repair wiring harness
Trace the cruise control circuit wiring from the steering wheel switch to the ECM. Look for corrosion, damage, or loose connections. Repair or replace damaged sections and ensure all connectors are clean and fully seated.
- 3
Clean or replace cruise control connectors
Disconnect and inspect all cruise control circuit connectors for corrosion or damage. Clean with electrical contact cleaner or replace connectors if severely corroded.
- 4
Test and potentially replace ECM
If other components check out, have the ECM tested by a professional diagnostician. If confirmed faulty, the module may need replacement or reprogramming.
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