Cruise Control Multi-Function Input Circuit Low
The P0580 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the cruise control multi-function input circuit. This circuit carries signals from the steering wheel switches (set, resume, cancel, etc.) to the PCM. A low voltage reading suggests a short to ground, a faulty switch, or a wiring issue, preventing the cruise control system from operating correctly.
01. Most Common Causes
- Faulty cruise control switch assembly
- Short to ground in the multi-function input circuit
- Damaged wiring or connector at the steering column
- Corroded or loose terminals in the clock spring
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control warning light illuminated
- Intermittent cruise control operation
- No response from cruise control switches
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Inspect the cruise control switch assembly for physical damage or sticking.
Step 3: Check the wiring and connectors between the switch and PCM for shorts, opens, or corrosion.
Step 4: Test the switch resistance with a multimeter; compare to manufacturer specs.
Step 5: If wiring and switch are good, test the clock spring continuity and replace if faulty.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, the vehicle is safe to drive, but cruise control will not function. The issue does not affect braking or steering.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, depending on whether a switch or wiring repair is needed.