Cruise Control/Brake Switch A Circuit Low
The P0572 code indicates that the powertrain control module (PCM) has detected a low voltage signal from the brake switch A circuit. This circuit is responsible for disengaging the cruise control when the brake pedal is pressed. A low voltage condition can prevent the cruise control from operating correctly or cause it to disengage unexpectedly.
01. Most Common Causes
- Faulty brake switch
- Open or shorted brake switch circuit wiring
- Corroded or loose electrical connector at brake switch
- Blown fuse in brake circuit
02. Symptoms You Will Notice
- Cruise control inoperative
- Cruise control disengages unexpectedly
- Brake lights may not illuminate when pedal is pressed
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for any related codes.
Step 2: Inspect the brake switch for proper operation and adjust if necessary.
Step 3: Check the brake switch circuit wiring for opens, shorts, or corrosion.
Step 4: Test the brake switch connector for voltage and ground signals.
Step 5: Replace the brake switch if faulty and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but the cruise control may not work and the brake lights could be affected, which is a safety concern. It is recommended to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. A brake switch replacement is usually under $50, with labor adding $30-$100.