<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 high-pressure fuel injector circuit issue.</li> <li><b>Increased Fuel Consumption</b>: A malfunctioning injector can lead to inefficient fuel combustion, resulting in higher fuel consumption. This is linked to the improper functioning of the high-pressure fuel injector low side circuit.</li> <li><b>Engine Stalling</b>: The engine may stall or have difficulty starting. This symptom is related to the disrupted fuel supply to cylinder 2, which is essential for proper engine operation.</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 can disrupt the electrical flow, causing the error code.</li><li>Poor electrical connections in the fuel injector 2 circuit can result in intermittent or failed signals.</li><li>A faulty Digital Motor Electronics (DME) unit can misinterpret or fail to process signals correctly, triggering the error code.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P3106 and check for any additional codes that may be related.</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>: Use a multimeter to measure the resistance of the high-pressure fuel injector on cylinder 2. Compare the reading to 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 using 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 ECM</b>: If all previous steps are normal, inspect the ECM for any faults or issues that may be causing the high side circuit to read high.</li> <li><b>Perform Functional Test</b>: Conduct a functional test of the high-pressure fuel injector on cylinder 2 to ensure it is operating correctly.</li> <li><b>Clear Codes and Retest</b>: After performing necessary repairs, clear the DTC codes and perform a road test to ensure the issue has been resolved and the code does not return.</li></ul>

<p>The DTC code P3106 indicates a high voltage condition in the low side circuit of the high-pressure fuel injector for cylinder 2. This is a critical issue.</p><ul><li><b>Immediate Actions:</b> Inspect the wiring and connectors for damage or corrosion.</li><li>Check the fuel injector for proper operation.</li><li>Test the engine control module (ECM) for faults.</li></ul><p>Delaying repair can lead to severe engine performance issues, potential engine damage, and unsafe driving conditions.</p>