DTC Code P0573 – What does this code mean for Mercedes?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The engine light illuminates due to a detected issue in the cruise control/brake switch 'A' circuit. This can be caused by a faulty brake switch, damaged wiring, or a malfunctioning cruise control module.</li> <li><b>Stop light inoperative</b>: The stop lights may not function properly, indicating a potential problem with the brake switch or associated wiring. This can be due to a short circuit, open circuit, or a defective brake switch.</li> <li><b>Cruise control system inoperative</b>: The cruise control system may fail to engage or operate correctly. This is often linked to issues with the brake switch, wiring harness, or the cruise control module itself.</li> </ul>

<ul><li>The brake switch may be faulty, leading to incorrect signals being sent to the cruise control system.</li><li>An open or shorted brake switch harness can disrupt the electrical flow, causing the circuit to register a high signal.</li><li>Poor electrical connections in the brake switch circuit can result in intermittent or incorrect signals, triggering the error code.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P0573 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the brake switch and its wiring for any visible damage, corrosion, or loose connections.</li> <li><b>Check Brake Switch Operation</b>: Test the brake switch using a multimeter to ensure it is functioning correctly. Verify that the switch opens and closes properly when the brake pedal is pressed and released.</li> <li><b>Inspect Fuse</b>: Check the fuse related to the brake switch circuit. Replace if blown.</li> <li><b>Test Voltage Supply</b>: Measure the voltage supply to the brake switch. Ensure it matches the manufacturer's specifications.</li> <li><b>Check Ground Connection</b>: Verify the ground connection for the brake switch circuit. Ensure it is clean and secure.</li> <li><b>Inspect Cruise Control Module</b>: Check the cruise control module for any signs of damage or malfunction. Ensure all connections are secure.</li> <li><b>Clear Codes and Test Drive</b>: Clear the DTC codes and perform a test drive to see if the code reappears. Monitor the brake switch and cruise control operation during the test drive.</li></ul>

<p>The DTC code P0573 indicates a high voltage issue in the Cruise Control/Brake Switch 'A' Circuit for Mercedes vehicles.</p><ul><li><b>Immediate Actions:</b> Inspect and replace the brake switch if necessary.</li><li><b>Potential Risks:</b> Failure to address this issue can lead to malfunctioning cruise control and brake lights, increasing the risk of accidents.</li></ul>