DTC Code P1260 – What does this code mean for Mercedes?

<ul> <li><b>Engine Cranks but Does Not Start</b>: The engine may crank, but it will not start due to the anti-theft system disabling the engine. This is a direct result of the anti-theft system detecting an unauthorized access attempt.</li> <li><b>Anti-Theft Warning Light</b>: The anti-theft warning light on the dashboard may illuminate, indicating that the system has detected a potential security breach.</li> <li><b>No Response from Ignition</b>: Turning the key or pressing the start button may result in no response from the ignition system, as the anti-theft system has disabled the engine.</li> <li><b>Security System Alerts</b>: The vehicle's security system may trigger alerts such as horn honking or flashing lights, indicating an attempted theft.</li> </ul>

<ul><li>The anti-theft system has detected an unauthorized attempt to start the vehicle, triggering the engine disable function.</li><li>A malfunction in the key fob or its communication with the vehicle's immobilizer system.</li><li>Issues with the vehicle's immobilizer system, such as a faulty transponder chip or antenna ring.</li><li>Problems with the anti-theft control module, including software glitches or hardware failures.</li><li>Electrical issues such as damaged wiring or poor connections within the anti-theft system circuit.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P1260. Record any additional codes that may be present.</li> <li><b>Check Anti-Theft System</b>: Inspect the anti-theft system components, including the immobilizer, key fob, and ignition switch. Ensure all connections are secure and there are no visible signs of damage.</li> <li><b>Battery Voltage Check</b>: Measure the battery voltage to ensure it is within the manufacturer's specifications. Low voltage can trigger anti-theft system issues.</li> <li><b>Key Fob Functionality</b>: Test the key fob to ensure it is transmitting a signal. Replace the battery if necessary and reprogram the key fob if it is not functioning correctly.</li> <li><b>Immobilizer Antenna Check</b>: Inspect the immobilizer antenna for any signs of damage or disconnection. Ensure it is properly aligned and functioning.</li> <li><b>Wiring and Connector Inspection</b>: Examine the wiring and connectors related to the anti-theft system for any signs of corrosion, damage, or loose connections. Repair or replace as needed.</li> <li><b>ECU Communication Test</b>: Verify that the Engine Control Unit (ECU) is communicating properly with the anti-theft system. Use diagnostic tools to check for any communication errors.</li> <li><b>Clear Codes and Test Drive</b>: After addressing any issues, clear the DTC codes and perform a test drive to ensure the problem is resolved. Re-scan for codes to confirm.</li></ul>

<p>The DTC code P1260 indicates that the anti-theft system has detected a signal and disabled the engine in a Mercedes vehicle.</p><ul><li><b>Immediate Actions:</b> Inspect the anti-theft system components, including the key fob, immobilizer, and related wiring.</li><li><b>Potential Risks:</b> Delayed repair can result in the vehicle being inoperable, posing a significant inconvenience and potential security risk.</li></ul>