<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates a detected issue with the high-pressure fuel injector low side circuit for cylinder 2. This could be due to a malfunctioning injector, wiring issues, or a faulty control module.</li> <li><b>Poor Engine Performance</b>: The vehicle may experience reduced power, misfires, or rough idling. This is often caused by improper fuel delivery to cylinder 2 due to the low side circuit issue.</li> <li><b>Increased Fuel Consumption</b>: A malfunctioning injector can lead to inefficient fuel usage, causing the engine to consume more fuel than usual.</li> <li><b>Difficulty Starting the Engine</b>: The engine may have trouble starting or may not start at all if the fuel injector for cylinder 2 is not functioning correctly.</li> </ul>

<ul><li>The fuel injector for cylinder 2 may be malfunctioning, leading to improper fuel delivery.</li><li>An open or shorted harness in the fuel injector 2 circuit can disrupt the electrical flow.</li><li>Poor electrical connections in the fuel injector 2 circuit can cause intermittent or weak signals.</li><li>Issues with the Digital Motor Electronics (DME) can affect the control and operation of the fuel injector.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P3105 and check for any additional codes.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the high-pressure fuel injector on cylinder 2 for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Injector Resistance</b>: Measure the resistance of the high-pressure fuel injector on cylinder 2 using a multimeter. Compare the readings with the manufacturer's specifications.</li> <li><b>Inspect Power Supply</b>: Verify that the injector is receiving the correct voltage by checking the power supply to the injector with a multimeter.</li> <li><b>Test Injector Driver Circuit</b>: Check the injector driver circuit in the Engine Control Module (ECM) for proper operation. This may involve using an oscilloscope to observe the injector pulse signal.</li> <li><b>Check for ECM Faults</b>: Inspect the ECM for any faults or issues that could be causing the low side circuit to malfunction.</li> <li><b>Perform Injector Swap</b>: Swap the high-pressure fuel injector from cylinder 2 with another cylinder to see if the problem follows the injector. This helps determine if the injector itself is faulty.</li> <li><b>Final Verification</b>: Clear the codes and perform a road test to ensure the issue has been resolved. Re-scan the system to confirm that DTC P3105 does not reappear.</li></ul>

<p>The DTC code P3105 indicates a problem with the Cylinder 2 High-Pressure Fuel Injector Low Side Circuit Low. This is a critical issue.</p><ul><li><b>Immediate Actions:</b> Inspect the fuel injector wiring and connectors for damage or disconnection.</li><li><b>Potential Risks:</b> Delayed repair can lead to engine misfires, poor performance, and potential engine damage.</li></ul>