Whatsup everybody. I'm recently pick up a 2003 gmc Yukon denali. I'm looking for some input about these trucks ect. I got it from a dealer in bronx N.Y. I've had it for about two weeks. And it has issues that I didn't notice when I got the truck. Code P0300 and my Auto ride doesn't work on its own, so I installed a switch to get it to work. Last but not least, my fan blower motor won't shut off at all. Someone ran a wire from the driver's side to the blower motor. All advice would be greatly satisfied. Thanks in advance