<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: <b>Engine Light ON</b> indicates a problem with the 'B' Rocker Arm Actuator System on Bank 1. This could be due to <causes> such as a faulty rocker arm actuator, wiring issues, or a malfunctioning PCM/ECM.</li> <li><b>Reduced Engine Performance</b>: <b>Reduced Engine Performance</b> may occur as the engine's valve timing is affected. This can lead to <causes> such as poor acceleration, rough idling, or decreased fuel efficiency.</li> <li><b>Engine Misfire</b>: <b>Engine Misfire</b> can be a symptom of the 'B' Rocker Arm Actuator System being stuck. This can result from <causes> like a stuck actuator or issues with the oil control valve.</li> <li><b>Unusual Engine Noises</b>: <b>Unusual Engine Noises</b> such as ticking or knocking sounds may be heard. These noises can be linked to <causes> like mechanical failure within the rocker arm actuator system.</li> </ul>

<ul><li>Engine oil level is either too low or overfilled, affecting the actuator's performance.</li><li>Using an incorrect type of engine oil can lead to improper lubrication and actuator malfunction.</li><li>The 'B' Rocker Arm Actuator itself may be faulty, causing it to stick.</li><li>An open or shorted harness in the 'B' Rocker Arm Actuator can disrupt the electrical signals.</li><li>Poor electrical connections in the 'B' Rocker Arm Actuator circuit can lead to intermittent or failed operation.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P2652 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the 'B' rocker arm actuator for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Oil Level and Condition</b>: Ensure the engine oil is at the correct level and in good condition. Low or dirty oil can affect the actuator's performance.</li> <li><b>Test Rocker Arm Actuator</b>: Using a multimeter, test the resistance of the 'B' rocker arm actuator. Compare the readings with the manufacturer's specifications.</li> <li><b>Inspect Actuator Control Circuit</b>: Check the actuator control circuit for continuity and proper voltage supply. Ensure there are no open or short circuits.</li> <li><b>Check Engine Control Module (ECM)</b>: Verify that the ECM is functioning correctly and sending the appropriate signals to the actuator.</li> <li><b>Perform Actuator Function Test</b>: Use a scan tool to perform an actuator function test to see if the actuator responds correctly to commands.</li> <li><b>Replace Actuator if Necessary</b>: If the actuator is found to be faulty, replace it and clear the DTC code. Re-test the system to ensure the issue is resolved.</li></ul>

<p>The DTC code P2652 indicates that the 'B' Rocker Arm Actuator System is stuck on Bank 1. This is a critical issue.</p><ul><li><b>Immediate Actions:</b> Inspect and possibly replace the rocker arm actuator.</li><li><b>Potential Risks:</b> Delayed repair can lead to severe engine damage, reduced performance, and increased fuel consumption.</li></ul>