DTC P0573 Cruise Control/Brake Switch A Circuit High

In the intricate web of automotive diagnostics, the emergence of Diagnostic Trouble Code (DTC) P0573 can disrupt the seamless functioning of a crucial component: the Cruise Control/Brake Switch A circuit. This code indicates a high circuit condition, necessitating a comprehensive understanding of its meaning, potential causes, symptoms, diagnostic procedures, and effective solutions. In this detailed guide, we embark on a journey to unravel the complexities of DTC P0573, offering insights into how to address this issue and restore the optimal performance of your vehicle.

1. What Does P0573 Code Mean?

DTC P0573 points to a high circuit condition in the “Cruise Control/Brake Switch A” circuit. This occurrence is flagged when the vehicle’s control module detects a voltage higher than expected within the circuit. The cruise control/brake switch, crucial for disengaging the cruise control when the brake pedal is pressed, plays a pivotal role in this scenario.

2. What Are the Causes of DTC P0573?

Understanding the potential causes of DTC P0573 is key to efficient diagnosis and resolution:

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

3. What Are the Symptoms of DTC P0573?

Identification of symptoms associated with DTC P0573 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 high voltage condition.
  • Constantly Illuminated Brake Lights: The brake lights may remain illuminated, even when the brake pedal is not 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 P0573?

Efficient diagnosis of DTC P0573 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 P0573.
  • 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 P0573 Problem?

Once the issue causing the high circuit condition in the “Cruise Control/Brake Switch A” circuit (DTC P0573) is identified, effective solutions are necessary:

  • Replace the faulty cruise control/brake switch if it is determined to be the cause of the high 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 P0573, indicating a high circuit condition in the “Cruise Control/Brake Switch A” circuit, demands attention to ensure the smooth operation of your vehicle’s cruise control system and brake lights. Armed with knowledge about the meaning of this code, the associated symptoms, potential causes, systematic diagnostic procedures, and effective solutions, you can navigate the path to resolving DTC P0573 and restoring the optimal functionality of your vehicle.