What's the code p2646 Chevy Malibu 2015?

The code P2646 in a Chevrolet Malibu typically indicates there is an issue with the arm actuator system, and that it is either stuck, or malfunctioning. The root cause of this could be due to the oil control valve, which can be found near the engine. To address it, first try thoroughly cleaning the solenoid valve, which is responsible for managing the amount of oil going into the engine. If this doesnt solve the issue, Your arm actuator system is almost certainly failing. This system, which is controlled by the ECM, is responsible for managing flow of oil into critical parts of the engine. As a result, it can be very dangerous to drive a car with a faulty arm actuator for extended periods of time.