Shift Interlock Cable: Description and Operation

OPERATION

The 8HP45 utilizes a fully electronic shifter mechanism with no physical connections to the transmission such as shifter linkage or cables. Due to this design the park function of the transmission is performed using electronic inputs and hydraulic pressure to hold to parking pawl lever in the disengaged position while moving. Once in park this hydraulic pressure is reduced which allows the lever to engage the parking pawl which in turn keeps the vehicle from rolling forward or rearward.

Should the vehicle or any component of the E-Shifter lose power or communication the parking pawl will be engaged and the vehicle cannot be moved. To move the vehicle there is a manual park release mechanism that will allow first responders to disengage the parking pawl and allow the vehicle to be moved further facilitating vehicle recovery such as towing or moving the vehicle to allow jump starting.