OBD-II code P3416 indicates that the powertrain control module (PCM) has detected a high voltage condition in the exhaust valve control circuit for cylinder 2. This is often related to cylinder deactivation systems, where the PCM commands oil flow to deactivate the exhaust valve, and a high circuit reading suggests a short to voltage, a faulty solenoid, or a wiring issue.
The solenoid that controls oil flow to the exhaust valve lifter may be stuck open or shorted internally, causing a high voltage reading in the control circuit.
The control circuit wire for the cylinder 2 exhaust valve solenoid may be chafed or pinched, contacting a power source and causing a constant high voltage signal.
A mechanically stuck or collapsed lifter can alter the expected electrical feedback, leading the PCM to interpret the circuit as high.
Corrosion, loose terminals, or backed-out pins in the solenoid connector or PCM connector can cause intermittent high resistance or voltage readings.
The PCM itself may have an internal driver failure, but this is the least likely cause and should only be considered after all other possibilities are thoroughly ruled out.
It means the PCM has detected a higher-than-expected voltage in the electrical circuit that controls the exhaust valve deactivation for cylinder 2. This is often related to variable displacement or cylinder deactivation systems.
Driving with this code may cause engine misfires, reduced power, and potential damage to the catalytic converter or engine components. It is best to diagnose and repair the issue promptly.
No, the PCM is rarely the cause. The most common causes are a faulty deactivation solenoid, wiring issues, or a mechanical lifter problem. The PCM should only be suspected after all other possibilities are eliminated.
Replacing the cylinder deactivation solenoid (often part of the VLOM assembly) or repairing a short in the wiring harness are the most frequent repairs. Always check the engine oil level and condition first, as dirty or low oil can trigger this code.