OBD-II code P3445 indicates that the powertrain control module (PCM) has detected an open circuit in the exhaust valve control system for cylinder 6. This typically relates to engines equipped with cylinder deactivation technology, where the PCM cannot complete the electrical circuit to the exhaust valve control solenoid or actuator.
The solenoid itself has internally failed or burned out, resulting in an open circuit. This is the most common cause of this code.
The electrical wiring leading to the cylinder 6 exhaust valve control solenoid is broken, chafed, or melted, preventing current from flowing.
The electrical connector at the solenoid or the PCM has corroded, bent pins, or lost connection, creating an open circuit condition.
If the solenoid is integrated into a lifter oil manifold assembly, an internal electrical failure within the manifold assembly can trigger this specific open circuit code.
The engine computer has an internal driver failure preventing it from reading the circuit correctly. This is extremely rare and should only be considered after all wiring and solenoids are proven functional.
The vehicle can usually be driven, but the engine may run roughly and fuel economy will likely drop because the cylinder deactivation system will be disabled. It is best to diagnose and repair it promptly.
No, almost never. Drivers are frequently told to replace the PCM for this code, but an open circuit is almost always caused by a failed solenoid or damaged wiring. The PCM should only be replaced if it is definitively proven to have a failed internal driver.
Diagnosing and repairing wiring is generally straightforward. Replacing the solenoid is usually manageable, though accessibility can vary depending on engine layout and whether the solenoid is standalone or part of a larger lifter oil manifold assembly.
Ignoring the code will keep the Check Engine Light on and prevent the cylinder deactivation system from working, reducing fuel efficiency. If a mechanical valvetrain failure is also present, it could lead to more severe engine damage over time.