if you can get into the dash service menu see if access 3 is showing as on also check if the brakes are releasing in service got to drive motor and see if its pulling any amps as you try to drive. I've had a few trucks used in cold stores where the brakes have seized onto the rotor on the end of the motor. The SC doesn't have a GE panel with the distribution board the SP has that SC controllers are actually Zapi units re-badged as Crown