P0573 Code: Step-by-Step Repair

The P0573 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the cruise control and brake switch system in a vehicle. Specifically, it refers to the “Cruise Control/Brake Switch A Circuit High,” which means that the powertrain control module (PCM) has detected a higher-than-normal voltage in the circuit associated with the brake switch. This can lead to malfunctioning cruise control systems and potentially unsafe driving conditions if not addressed promptly.

Symptoms of P0573 Code

Understanding the symptoms associated with the P0573 code is crucial for vehicle owners and DIY mechanics. Recognizing these signs early can prevent further complications.

Common Symptoms

• Check Engine Light: The most obvious symptom is the illumination of the check engine light on the dashboard.
• Cruise Control Malfunction: The cruise control may fail to engage or disengage properly, leading to erratic vehicle speeds.
• Brake Lights Not Functioning: If the brake switch is faulty, the rear brake lights may not illuminate when the pedal is pressed.
• Erratic Speed Control: The vehicle may experience fluctuations in speed if the cruise control system is affected.

Technical Explanation of P0573 Code

The P0573 code is part of the OBD-II (On-Board Diagnostics II) system, which monitors various components of a vehicle’s powertrain. The “P” indicates a powertrain issue, while “0” signifies it as a generic code applicable across different makes and models. The “5” denotes that this code pertains to speed control and auxiliary inputs.

How It Works

When you press the brake pedal, it activates the brake switch, which sends a signal to the PCM. This signal indicates whether the cruise control should be engaged or disengaged. If there is an abnormal voltage level in this circuit—specifically a high voltage—the PCM triggers the P0573 code, disabling cruise control to ensure safety.

Step-by-Step Diagnosis

Diagnosing a P0573 code involves several steps to identify and rectify the underlying issue.

Step 1: Initial Scan

1. Use an OBD-II Scanner: Connect an OBD-II scanner to read stored trouble codes.
2. Clear Codes: Clear any existing codes and take the vehicle for a test drive to see if the P0573 code returns.

Step 2: Visual Inspection

1. Check Brake Switch: Inspect the brake switch for proper alignment and functionality.
2. Examine Wiring and Connectors: Look for damaged, frayed, or corroded wires and connectors related to the brake switch circuit.

Step 3: Voltage Testing

1. Test Voltage Levels: Use a multimeter to check voltage levels at the brake switch. A normal reading should be below 3 volts when not pressed and above 3 volts when pressed.
2. Check Ground Connections: Ensure all ground connections are intact and free from corrosion.

Step 4: Functional Testing

1. Test Brake Lights: Verify that all brake lights function correctly when pressing the pedal.
2. Inspect Cruise Control Module: If issues persist, examine the cruise control module for faults.

Solution Methods

Resolving a P0573 code may require different approaches depending on its cause.

Common Solutions

• Replace Faulty Brake Switch: If testing reveals that the brake switch is defective, replacing it usually resolves the issue.
• Repair Damaged Wiring: Address any damaged wiring or connectors found during inspection.
• Replace Blown Fuses: If blown fuses are identified, replace them to restore proper circuit functionality.
• Clean Debris from Brake Switch: Remove any debris obstructing the operation of the brake switch to ensure it functions properly.

Cost Estimates

The cost of repairs related to a P0573 code can vary widely based on labor rates and parts costs:

• Brake Switch Replacement: $50 – $150 (parts and labor)
• Wiring Repair/Replacement: $100 – $300 (depending on extent of damage)
• Fuse Replacement: $10 – $50 (typically minimal labor involved)

Warnings and Recommendations

• Professional Help Recommended: If you are not comfortable performing these diagnostics or repairs, it is advisable to seek assistance from a qualified mechanic.
• Safety First: Ignoring a P0573 code can lead to unsafe driving conditions due to malfunctioning cruise control or brake lights.

Closing Paragraph

The P0573 trouble code is significant as it directly impacts your vehicle’s ability to safely use cruise control. By understanding its meaning, symptoms, causes, and solutions, vehicle owners can take proactive steps toward resolving this issue. Regular maintenance and prompt attention to warning signs can enhance your vehicle’s safety and performance.

Frequently Asked Questions About P0573

• What does code P0573 mean?
  The P0573 code indicates that there is a high voltage condition detected in the cruise control brake switch circuit.
• What are common causes of P0573?
  Common causes include a faulty brake switch, damaged wiring or connectors, blown fuses, or debris obstructing switch operation.
• How serious is a P0573 code?
  This issue can affect your ability to use cruise control safely; therefore, it should be addressed promptly.
• Can I drive my car with a P0573 code?
  While you can drive your car, it’s recommended to fix this issue soon as it may lead to unsafe driving conditions.
• How do I diagnose a P0573 code?
  The diagnosis involves using an OBD-II scanner, inspecting wiring and connectors, testing voltage levels at the brake switch, and checking ground connections.
• What tools do I need for diagnosing P0573?
  You will need an OBD-II scanner, multimeter for voltage testing, and basic hand tools for inspection.
• Should I replace parts myself?
  If you have automotive experience and tools, you may replace parts yourself; otherwise, consult a professional mechanic.
• How much does it cost to fix a P0573 code?
  The cost varies but typically ranges from $50 for simple fuse replacement up to $300 for more extensive wiring repairs.