DTC P0572 Cruise Control/Brake Switch A Circuit Low

The automotive landscape is filled with intricate systems designed to enhance driving comfort and safety. One such system is cruise control, which allows for a consistent speed on the road. However, like any other system, cruise control can encounter issues. Diagnostic Trouble Code (DTC) P0572 is one such concern, indicating a low circuit condition in the “Cruise Control/Brake Switch A” circuit. In this detailed guide, we will explore the meaning of P0572, its potential causes, the symptoms it may manifest, and the steps to effectively diagnose and rectify this issue.

1. What Does P0572 Code Mean?

DTC P0572 signifies a low circuit condition in the “Cruise Control/Brake Switch A” circuit. This code is triggered when the vehicle’s control module detects a lower than expected voltage in the circuit that connects the cruise control system to the brake switch. The brake switch plays a crucial role in disengaging the cruise control when the brake pedal is applied.

2. What Are the Causes of DTC P0572?

Several factors can contribute to the occurrence of DTC P0572:

  • Faulty Cruise Control/Brake Switch: A malfunction in the cruise control/brake switch, typically located near the brake pedal, can lead to a low voltage condition in the circuit.
  • Wiring or Connection Issues: Damaged or corroded wiring, as well as poor electrical connections within the circuit, can cause a drop in voltage.
  • Faulty Brake Light Switch: As an integral part of the cruise control/brake switch circuit, any issues with the brake light switch can result in a low circuit condition.

3. What Are the Symptoms of DTC P0572?

Identifying the symptoms associated with DTC P0572 is crucial for prompt diagnosis. Common signs include:

  • Inoperative Cruise Control: The cruise control system may fail to engage or disengage properly due to the low voltage condition.
  • Inoperative Brake Lights: The brake lights may not illuminate when the brake pedal is pressed, indicating a potential issue with the brake switch.
  • Illuminated Warning Light: A warning light on the dashboard may illuminate, signaling a problem with the cruise control/brake switch circuit.

4. How to Diagnose DTC P0572?

Efficient diagnosis of DTC P0572 involves systematic steps to identify and rectify the issue:

  • Utilize an OBD-II scanner to retrieve the trouble code and confirm the presence of DTC P0572.
  • Inspect the cruise control/brake switch for visible damage or signs of malfunction. If detected, replace the switch.
  • Examine the wiring and connections associated with the “Cruise Control/Brake Switch A” circuit for damage, loose connections, or corrosion.
  • Test the brake light switch to ensure it is functioning correctly. If issues are found, consider replacing or repairing the switch.

5. How to Fix DTC P0572 Problem?

Once the issue causing the low circuit condition in the “Cruise Control/Brake Switch A” circuit (DTC P0572) is identified, effective solutions are necessary:

  • Replace the faulty cruise control/brake switch if it is determined to be the cause of the low voltage condition.
  • Repair or replace any damaged wiring, connectors, or loose connections within the circuit.
  • If the brake light switch is found to be faulty, 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 P0572, indicating a low circuit condition in the “Cruise Control/Brake Switch A” circuit, can disrupt the operation of your vehicle’s cruise control system and brake lights. Understanding the meaning of this code, recognizing the symptoms, identifying potential causes, conducting systematic diagnosis, and applying effective solutions are crucial for restoring the functionality of your cruise control system and ensuring the safety of your vehicle.