DTC Code P3087 – What does this code mean?

<ul> <li><a href="/problems/vw-check-engine-light-is-on"><b>Engine Light ON</b></a>: The engine light or service engine soon warning light illuminates on the dashboard, indicating a potential issue with the supply relay for engine components. This can be linked to a malfunctioning relay or electrical circuit issues.</li> <li><b>Engine Performance Issues</b>: The vehicle may experience reduced engine performance, such as hesitation or stalling, due to inadequate power supply to essential engine components.</li> <li><b>Starting Problems</b>: Difficulty in starting the engine or intermittent starting issues may occur, as the supply relay is crucial for providing power to engine components during ignition.</li> </ul>

<ul><li>The main battery cables may have poor connections or corrosion, leading to insufficient power supply to engine components.</li><li>A weak battery can result in inadequate voltage, affecting the relay's ability to supply power to the engine components effectively.</li></ul>

<ul> <li><b>Verify DTC Code</b>: Confirm the presence of DTC P3087 using a diagnostic scanner. Clear the code and see if it returns to ensure it's not a false trigger.</li> <li><b>Inspect Supply Relay</b>: Locate the supply relay for engine components in the fuse box. Check for any visible damage or corrosion on the relay and its connections.</li> <li><b>Test Relay Functionality</b>: Use a multimeter to test the relay's functionality. Ensure the relay is receiving power and is capable of switching as required.</li> <li><b>Check Wiring and Connectors</b>: Inspect the wiring and connectors associated with the supply relay. Look for signs of wear, damage, or loose connections that could affect relay operation.</li> <li><b>Examine Engine Components</b>: Check the engine components powered by the relay for any faults or issues that could cause excessive current draw, leading to relay failure.</li> <li><b>Perform ECU Check</b>: Verify the Engine Control Unit (ECU) is functioning correctly and is not sending erroneous signals to the relay.</li> <li><b>Re-test and Confirm</b>: After repairs or replacements, clear the DTC and perform a road test to ensure the code does not reappear.</li></ul>

<p>The DTC P3087 for Volkswagen indicates an issue with the <b>supply relay for engine components</b>. This is a <b>critical</b> issue as it can lead to <ul><li>engine stalling</li><li>loss of power</li><li>potential failure to start</li></ul>. Immediate attention is required to prevent <b>severe engine damage</b> and ensure <b>driver safety</b>. Delaying repair could result in <b>complete engine failure</b> and increased repair costs.</p>