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2004 GMC Yukon XL 2500 Questions

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It will go in gear but takes a lot of power to back up. It will not back up a hill. What do you all think is wring with it.
I replaced the axle shift motor,switch and shift motor. Where can I find a schematic ? Is there any relays, fuses etc. Shift motor is in neutral and won't engage any gears. Help!
My reduce engine power warning came on and the throttle was disabled. The engine was not overheating but I did replace the water pump and changed the oil. The warning light is still on and and throttle is still disengaged. I cant find any other problems with the engine. It idles fine with no leaking any where. Is there a reset for that warning indicator?
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