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Check if you are getting power to the reverse light switch. Turn ignition on, disconect terminals to the switch and check for power on the positive terminal using a light bulb or a test meter whatever. If power is there jumpthe 2 terminals and check if light backup light works. If it does replace switch. If ther is no power at switch check wiring from fuse box. If light does not work when switch is jumped check wiring to back.
You may have a broken direct drive drum or another internal problem that is preventing the forward clutch packs from being engaged. There might be a service code stored in the computer relating to the problem but if the problem is mechanical in nature it often won't set a code of any kind. I believe you have a 4L60E transmission in this vehicle and usually when I see this type of problem the transmission needs to come out and be repaired. Hope this helps a bit!