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Engine-Codes – Generic – P0579

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

Quick Answer

The OBD-II trouble code P0579 indicates a problem with the Cruise Control Multifunction Input 'A' Circuit Range/Performance. Common causes include Faulty cruise control multifunction switch, Wiring or electrical issues in the cruise control system, Defective cruise control module. 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, Wiring or electrical issues in the cruise control system, Defective cruise control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code P0579 Description

The OBD-II trouble code P0579 indicates a problem with the Cruise Control Multifunction Input 'A' Circuit Range/Performance. This code is set when the Engine Control Module (ECM) detects that the signal from the cruise control multifunction switch is out of the expected range or not performing as it should. The cruise control system allows the driver to set a desired speed for the vehicle to maintain automatically, which can improve fuel efficiency and reduce driver fatigue on long trips.

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

Common Causes of P0579

  1. Faulty cruise control multifunction switch
  2. Wiring or electrical issues in the cruise control system
  3. Defective cruise control module
  4. ECM software malfunction
  5. Loose or corroded electrical connections

Symptoms of P0579

  1. Inoperative cruise control system
  2. Cruise control not engaging or disengaging properly
  3. Cruise control setting not maintaining the desired speed
  4. Check Engine Light illuminated
  5. Possible decrease in fuel efficiency

How to Fix P0579

  1. Diagnose the root cause of the issue by using a scan tool to retrieve the trouble code and inspecting the cruise control system components.
  2. Test the cruise control multifunction switch for proper operation and replace if necessary.
  3. Check the wiring and electrical connections in the cruise control system for any damage or corrosion, repairing or replacing as needed.
  4. Inspect the cruise control module for faults and replace if found to be defective.
  5. Clear the trouble code from the ECM's memory and test the cruise control system to ensure proper functionality.

Cost to Fix P0579

The cost of repairing the Cruise Control Multifunction Input 'A' Circuit Range/Performance issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. In general, the parts needed for this repair, such as a new cruise control multifunction switch or module, may range from $50 to $200. Labor costs can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair.

When is the Code Detected?

The ECM has detected a multifunction switch A input error

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Code P0579 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.

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