DTC Code P0573 – What does this code mean?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The engine control module (ECM) detects an issue with the brake switch circuit, triggering the engine light. This can be caused by a faulty brake switch, damaged wiring, or a malfunctioning ECM.</li> <li><b>Stop light inoperative</b>: The brake lights may not function due to a high voltage issue in the brake switch circuit. Potential causes include a defective brake switch, poor electrical connections, or a short circuit.</li> <li><b>Cruise control system inoperative</b>: The cruise control system may be disabled as a safety measure when the brake switch circuit is compromised. This can be due to a malfunctioning brake switch, wiring issues, or a problem with the cruise control module.</li> </ul>

<ul><li>The brake pedal position sensor may be faulty, leading to incorrect voltage readings.</li><li>A misadjusted brake pedal position sensor can cause improper signal transmission.</li><li>An open or shorted brake pedal position sensor harness can disrupt the electrical flow.</li><li>Poor electrical connections in the brake pedal position sensor circuit can result in high voltage issues.</li><li>A malfunctioning Body Control Module (BCM) can incorrectly interpret the brake switch signals.</li></ul>

<ul> <li><b>Initial Inspection</b>: Check the brake switch and its wiring for any visible damage or disconnections. Ensure the brake pedal is functioning properly.</li> <li><b>Check Brake Switch Voltage</b>: Using a multimeter, measure the voltage at the brake switch. Compare the readings with the manufacturer's specifications.</li> <li><b>Inspect Brake Switch Connector</b>: Examine the brake switch connector for corrosion, bent pins, or poor connections. Clean or repair as necessary.</li> <li><b>Test Brake Switch Operation</b>: Manually operate the brake switch and observe the voltage changes. Ensure the switch is opening and closing correctly.</li> <li><b>Check for Short Circuits</b>: Inspect the wiring harness for any signs of short circuits or grounding issues. Repair any damaged wires.</li> <li><b>Scan for Additional Codes</b>: Use an OBD-II scanner to check for any other related codes that might indicate a broader issue.</li> <li><b>Replace Brake Switch</b>: If all tests indicate the brake switch is faulty, replace it with a new one and clear the DTC code.</li> <li><b>Final Verification</b>: After replacement, test drive the vehicle to ensure the issue is resolved and the DTC code does not reappear.</li></ul>

<p>The DTC code P0573 indicates a high voltage issue in the brake switch circuit. This is a critical problem as it can affect the vehicle's braking system and safety features.</p><ul><li><b>Immediate Actions:</b> Inspect and replace the brake switch if necessary.</li><li><b>Potential Risks:</b> Delayed repair can lead to brake light malfunction, cruise control issues, and compromised vehicle safety.</li></ul>