<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 Rocker Arm Oil Control Solenoid 'A' Circuit Low Voltage on Bank 2. This could be due to <causes> such as a faulty solenoid, wiring issues, or a malfunctioning control module.</li> <li><b>Reduced Engine Performance</b>: The vehicle may experience reduced engine performance or erratic idling. This is often linked to <causes> such as improper oil flow to the rocker arms, affecting valve timing and engine efficiency.</li> <li><b>Poor Fuel Economy</b>: A noticeable drop in fuel efficiency can occur due to the engine not operating at optimal timing. This is typically caused by <causes> such as a malfunctioning oil control solenoid or related electrical issues.</li> <li><b>Engine Misfire</b>: The engine may misfire or run rough, which can be attributed to <causes> such as inadequate oil pressure to the rocker arms, leading to improper valve operation.</li> </ul>

<ul><li>Engine oil level is either too low or overfilled, affecting the solenoid's operation.</li><li>Incorrect engine oil type can lead to improper lubrication and solenoid malfunction.</li><li>The 'A' Rocker Arm Actuator itself may be faulty, causing circuit issues.</li><li>An open or shorted harness in the 'A' Rocker Arm Actuator can disrupt the electrical flow.</li><li>Poor electrical connection in the 'A' Rocker Arm Actuator circuit can lead to low voltage readings.</li></ul>

<ul> <li><b>Initial Inspection</b>: Check the vehicle's battery voltage and ensure it is within the manufacturer's specifications. Low battery voltage can cause various electrical issues.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the Rocker Arm Oil Control Solenoid 'A' on Bank 2. Look for signs of damage, corrosion, or loose connections.</li> <li><b>Check Solenoid Resistance</b>: Using a multimeter, measure the resistance of the Rocker Arm Oil Control Solenoid 'A'. Compare the readings with the manufacturer's specifications to ensure it is within the acceptable range.</li> <li><b>Test Power Supply</b>: Verify that the solenoid is receiving the correct voltage from the power supply. Use a multimeter to check the voltage at the solenoid connector while the engine is running.</li> <li><b>Check Control Signal</b>: Using an oscilloscope, check the control signal from the Engine Control Module (ECM) to the solenoid. Ensure the signal is consistent and within the expected parameters.</li> <li><b>Inspect ECM</b>: If all previous steps are within specifications, inspect the ECM for any faults or issues. Consider reprogramming or replacing the ECM if necessary.</li> <li><b>Final Verification</b>: Clear the DTC code and perform a test drive to ensure the issue has been resolved. Monitor the system for any reoccurrence of the code.</li></ul>

<p>The DTC code P2658 indicates a low voltage issue in the Rocker Arm Oil Control Solenoid 'A' Circuit on Bank 2. This is a critical issue as it can lead to improper valve timing, affecting engine performance and potentially causing severe engine damage.</p><ul><li><b>Immediate Actions:</b> Inspect and replace the solenoid if necessary.</li><li>Check wiring and connections for any signs of damage or corrosion.</li><li>Verify the voltage supply to ensure it meets specifications.</li></ul><p>Delaying repair can result in significant engine performance issues and costly repairs.</p>