P0579 Code: Cruise Control Multi-Function Input A Circuit Range/Performance
🟢 Low severity · drivable
The car drives normally; only the cruise control buttons may not respond correctly.
What P0579 means
The multi-function cruise control switch sends signals through one circuit, and the computer says the signal is out of its expected range. The switch still communicates, but the readings don't match what the computer expects.
Symptoms
- Check engine light is on
- Cruise control buttons respond incorrectly
- Cruise control works only sometimes
- Cruise won't engage or set properly
Common causes
- most common: Faulty multi-function switch
- common: Worn buttons or switch contacts
- common: Damaged clock spring
- less common: Wiring or connector issue
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Test the multi-function switch signals with a multimeter | Yes | $0–20 |
| Replace the multi-function switch | Yes | $50–200 |
| Replace the clock spring or repair wiring | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0579 code?
Yes. The car drives normally; only the cruise buttons may act up.
What does range/performance mean here?
The multi-function switch is sending a signal, but its voltage is outside the range the computer expects for the button pressed.
How much does it cost to fix a P0579?
A multi-function switch is $50–200; a clock spring is about $100–300 installed.
Related codes
P0578
P0578 Code: Cruise Control Multi-Function Input A Circuit Stuck
P0580P0580 Code: Cruise Control Multi-Function Input A Circuit Low
P0575P0575 Code: Cruise Control Input Circuit
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.