The power lift gate works on my 2011 Suburban LTZ except when the remote start is in use. It also will not unlatch the lift gate lock for manual operation when the power lift gate button in the cabin is set to off. Strangely, the power lift gate works in powered operation whether the interior button is in the on or off position. I’ve replaced the lift gate latch and motor (and the close button on the bottom of the gate that I broke) but nothing else. Any idea where to start next?