This problem is usually a position fault sensor,but it can be a control module failure in which the module does not read the correct data from the door sensors.
Here is how to enter diagnostic mode to see if module has set a failure.
Diagnostic Mode 1 sounds the DTCs through the power sliding door alarm. Enter Diagnostic Mode 1 by performing the following procedure:
Upon entering Diagnostic Mode 1, the following actions occur:
If you want to exit diagnostics after Diagnostic Mode 1 has been completed, refer to How to Exit Diagnostics in this section. If you want to perform Diagnostic Mode 2, do not exit Diagnostic Mode 1. Refer to How to Enter Diagnostic Mode 2 for procedure.
No Diagnostic Trouble Codes Found
Door Position Fault
Door Motion Error Sensed On Actuation
No Latch Input
Controller Error (GEN 1 Models Only)
Vehicle Speed Signal Circuit Open (GEN 2 Models Only)
Vehicle Speed Signal Circuit Shorted to Ground
This means that there is no code ,but sometimes it may not set.You most likely have a bad door module that will not transfer power to the motor.here is some info to help.
Quarter Lower Rear Trim Panel Replacement
Door Trim Pad and Garnish Clip Remover
Rear Side Door Actuator Control Module Replacement
Remove the right rear quarter lower trim panel.