P0579 — Cruise Control Multi-Function Input A Circuit Range/Performance

What Does P0579 Mean?

P0579 is a diagnostic trouble code indicating: Cruise Control Multi-Function Input A Circuit Range/Performance. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0579

⚠️ Check Engine Light (MIL) illuminated
⚠️ Cruise Control Multi-Function Input A not operating within expected parameters
⚠️ Reduced efficiency or performance of related system
⚠️ Erratic idle speed

Common Causes

🔍 Cruise Control Multi-Function Input A degraded or contaminated
🔍 Mechanical wear or binding in Cruise Control Multi-Function Input A
🔍 Incorrect Cruise Control Multi-Function Input A installed (wrong part number)
🔍 Related system mechanical issue affecting Cruise Control Multi-Function Input A readings

Frequently Asked Questions

What does P0579 mean?

P0579 indicates: Cruise Control Multi-Function Input A Circuit Range/Performance. The vehicle's computer has detected that the Cruise Control Multi-Function Input A is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0579?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P0579 for extended periods may cause additional problems.

How much does it cost to fix P0579?

Repair costs for P0579 typically range from $50 to $250, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and clean Cruise Control Multi-Function Input A
🔧 Replace degraded Cruise Control Multi-Function Input A
🔧 Check for related mechanical issues affecting readings

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0579: Cruise Control Multi-Function Input A Circuit Range/Performance