AutoCodes – Generic – P0579

P0579 Code - Cruise Control Multifunction Input 'A' Circuit Range/Performance

Quick Answer

The Engine Control Module (ECM) monitors the Cruise Control Multi-Function Input 'A'. Common causes include Faulty Cruise Control Multifunction Switch, Cruise Control Multifunction Switch harness is open or shorted, Cruise Control Multifunction Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0579 indicates Cruise Control Multifunction Input 'A' Circuit Range/Performance.
Common causes: Common causes include Faulty Cruise Control Multifunction Switch, Cruise Control Multifunction Switch harness is open or shorted, Cruise Control Multifunction Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 24,593

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0579 Description

The Engine Control Module (ECM) monitors the Cruise Control Multi-Function Input 'A'. The ECM sets the OBDII code when the Cruise Control Multi-Function Input 'A' is not to factory specifications.

OBDII Code P0579 - Cruise Control Multifunction Input 'A' Circuit Range/Performance - AutoCodes.com — P0579 Code - Cruise Control Multifunction Input 'A' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0579?

Faulty Cruise Control Multifunction Switch
Cruise Control Multifunction Switch harness is open or shorted
Cruise Control Multifunction Switch circuit poor electrical connection

How to Fix the DTC P0579?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0579 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0579 code?

Need more information on how to fix the P0579 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0579 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0579 Chrysler — Speed Control Switch 1 Performance Condition
P0579 Dodge — Speed Control Switch 1 Performance Condition
P0579 Ford — Cruise Control Multifunction Input 'A' Circuit Range/Performance
P0579 Mazda — Cruise Control Multi-Function Input 'A' Circuit Range/Performance
P0579 Mercedes-Benz — Cruise Control Multifunction Input 'A' Circuit Range/Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.