Engine control module park lock solenoid control for hybrid transmission

A method of controlling a non-inverted park lock system for a transmission of a vehicle, the method comprising:

• providing an engine controller configured to control an engine of the vehicle and in communication with a separate transmission controller via a controller area network (CAN), wherein the transmission controller is configured to control the transmission;
• providing a conductor connecting the engine controller to a park lock solenoid disposed in the transmission and configured to move a park pawl to engage/disengage park;
• maintaining, by the engine controller, the park pawl disengaged from park during a power loss malfunction at the transmission controller by supplying the park lock solenoid with energizing current via the conductor until park is requested via a shifter;
• and
• maintaining, by the transmission controller, the park pawl disengaged from park during a power loss malfunction at the engine controller by maintaining hydraulic pressure in the transmission at a threshold level until park is requested via the shifter.