DTC P0579 Cruise Control Related Malfunction

As we delve into the intricate world of automotive diagnostics, we encounter the enigmatic Diagnostic Trouble Code (DTC) P0579, signaling a Cruise Control Related Malfunction. In this comprehensive guide, we aim to demystify the intricacies surrounding this code, providing insights into its meaning, potential causes, symptoms, diagnostic approaches, and effective solutions. Join us on this journey to unravel the complexities of DTC P0579 and gain the knowledge needed to address and rectify this cruise control-related issue.

1. What Does P0579 Code Mean?

DTC P0579 emerges when the vehicle’s control module detects a malfunction related to the cruise control system. This code specifically points to issues within the circuitry or components associated with cruise control. Understanding the nuances of this code is essential for effective diagnosis and resolution.

2. What Are the Causes of DTC P0579?

Identifying the potential causes of DTC P0579 lays the foundation for efficient troubleshooting. Common culprits include:

  • Faulty Cruise Control Switch: Malfunctions in the cruise control switch, a critical component for engaging and disengaging cruise control, can trigger DTC P0579.
  • Issues with Cruise Control Wiring or Connectors: Damaged or corroded wiring, as well as poor electrical connections within the cruise control circuit, may contribute to this malfunction.
  • Defective Cruise Control Module: A malfunction in the cruise control module itself can lead to DTC P0579.

3. What Are the Symptoms of DTC P0579?

Recognizing the symptoms associated with DTC P0579 is vital for early detection and intervention. Common signs include:

  • Inoperative Cruise Control: The cruise control system may fail to engage or disengage properly, impacting its functionality.
  • Illuminated Warning Lights: Warning lights on the vehicle’s dashboard may illuminate, signaling a problem with the cruise control system.
  • Abnormal Cruise Control Behavior: Unusual behavior of the cruise control system, such as erratic speed control or unexpected disengagement, may occur.

4. How to Diagnose DTC P0579?

Efficient diagnosis of DTC P0579 involves a systematic approach to identify the root cause of the cruise control-related malfunction:

  • Use an OBD-II scanner to retrieve the trouble code and confirm the presence of DTC P0579.
  • Inspect the cruise control switch for visible damage or signs of malfunction. Replace the switch if issues are detected.
  • Examine the wiring and connectors associated with the cruise control circuit for damage, loose connections, or corrosion.
  • Test the cruise control module for proper functionality. If faults are identified, consider replacing or repairing the module.

5. How to Fix DTC P0579 Problem?

Once the underlying cause of DTC P0579 is identified, effective solutions are crucial for restoring the proper operation of the cruise control system:

  • Replace the faulty cruise control switch if it is determined to be the source of the malfunction.
  • Repair or replace any damaged wiring, connectors, or loose connections within the cruise control circuit.
  • If the cruise control module is found to be defective, consider replacing or repairing it.
  • After making the necessary repairs, use an OBD-II scanner to clear the trouble code and conduct tests to ensure the cruise control system functions correctly.


DTC P0579, indicative of a Cruise Control Related Malfunction, poses challenges to the seamless operation of your vehicle’s cruise control system. Armed with knowledge about the code’s meaning, associated symptoms, potential causes, systematic diagnostic procedures, and effective solutions, you can navigate the path to resolving DTC P0579 and restoring optimal functionality to your vehicle’s cruise control system.