DTC Code C0116 – What does this code mean?

<ul> <li><b>Anti-Lock Brake System (ABS) Warning Light ON</b>: The ABS warning light illuminates when there is a malfunction in the stop light switch circuit. This can affect the vehicle's braking performance and safety features.</li> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The engine light or service engine soon warning light may turn on due to the stop light switch circuit malfunction, indicating an issue that needs immediate attention to prevent further damage.</li> </ul>

<ul><li>The stop light switch may be faulty, leading to incorrect signals being sent to the vehicle's control module.</li><li>An open or shorted harness in the stop light switch can disrupt the electrical flow, causing the malfunction.</li><li>Poor electrical connections in the stop light switch circuit can result in intermittent or failed communication with the control module.</li></ul>

<ul> <li><b>Initial Inspection</b>: Check the stop light switch for any visible damage or disconnection. Ensure the brake lights are functioning properly.</li> <li><b>Check Stop Light Switch</b>: Use a multimeter to test the stop light switch for continuity. Verify that the switch closes when the brake pedal is pressed.</li> <li><b>Inspect Wiring and Connectors</b>: Examine the wiring and connectors leading to and from the stop light switch for any signs of wear, corrosion, or disconnection.</li> <li><b>Test Brake Light Circuit</b>: Check the voltage at the brake light circuit. Ensure there is proper voltage when the brake pedal is pressed.</li> <li><b>Scan for Additional Codes</b>: Use an OBD-II scanner to check for any additional DTCs that may be related to the stop light switch circuit.</li> <li><b>Check Brake Light Bulbs</b>: Inspect the brake light bulbs to ensure they are not burnt out or faulty. Replace if necessary.</li> <li><b>Verify Brake Pedal Position Sensor</b>: If applicable, check the brake pedal position sensor for proper operation and alignment.</li> <li><b>Clear Codes and Test Drive</b>: After repairs, clear the DTC codes and perform a test drive to ensure the issue is resolved and the code does not reappear.</li></ul>

<p>The DTC code C0116 indicates a Stop Light Switch Circuit Malfunction. This is a critical issue as it affects the vehicle's braking system and can lead to brake lights not functioning properly.</p><ul><li><b>Immediate Actions:</b> Inspect and repair the stop light switch circuit immediately.</li><li><b>Potential Risks:</b> Increased risk of rear-end collisions due to non-functional brake lights, leading to severe safety hazards.</li></ul>