GMC Yukon Questions

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fuses are fine, horn and wiring under hood are good, whats wrong?
is no check 4wd message and no code.you can hear it trying to switch when you roll the window down.can you help me with this is it the actuator or transfer case switch motor that is bad
It only lights up for a short time if you tap on the dash board.Do you know which fuse to change or is it a short?
The cap has a lanyard that is attached to the inside of the fuel tank door opening. Trying to find a way to remove it, so I can install a new cap.
Can you advise what might be causing this issue (relay)
When I purchased my 2007 GMC Yukon the passenger power seat would adjust back and forth; however, it would not adjust up and down. Thank you.
I just changed the starter as well as the fuel filter.the fuel pump turns and it starts when I put gas in the carborater but it won't stay on...
Even though I had the code erased. What else could be the problem?
Any idea what is causing this to happen? we have changed the oil the crank shaft sensor
I replaced the starter already. It's not the battery or alternates. It's not turning over.
I put my old brake booster back in and I even replaced the brake light sencer that hooks on to the brake bar what ever I try nothing is working.