My 2005 Yukon xl doesn't start right away in the

SOURCE: 2005 Yukon XL, third brake light intermittent

Remove bulb, make sure it sits tight in the socket. make sure socket is not burnt up (brown or black in color) Check bulb, if the filament inside is loose or discolored, replace as nesessary. Check brake light switch under driver side dash above brake pedal. make sure it is adjusted correctly.

SOURCE: 2005 gmc yukon xl denali service ride control

it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you

SOURCE: 2007 yukon xl battery dead recharged battery will

We had the same issue with our 2007 Yukon Denali XL. Died on us twice after sitting for short periods of time; once we watched a DVD with the engine off and battery died within 10 minutes. The dealership kept it overnight to troubleshoot why the battery died so quickly. They said the radio was "pulling" too much from the battery. (They supposably fixed it) But again a few days later the battery died again after sitting overnight. We brought it back to the dealership and they brought in a GMC "expert" to replace the entire DVD/CD/Navigation system. They also replaced our battery with a much larger battery, similar to the ones that GMC puts in there diesel trucks. They had our Denali for 5 days, but it appears to be fixed now.
Getting it fixed correctly wasn't without headaches, but it was all covered under warranty, including the battery. And they are updating the nav w/ the new edition disc as well for no charge.

Harvey N Tawatao

• 3854 Answers
• Posted on Dec 13, 2009

SOURCE: 2001 gmc yukon xl key in ignition won't turn to

The tumblers in the ignition lock may be seized, try cleaning it out first with a small spray of WD40 and try the spare ignition keys. The keys it self may be too worn down for the tumblers in the lock and if you have lots of other keys on your key chains, this will promote the lock to wear out quicker. Good luck and hope this helps and try turning the steering where back and forth as you try to turn the ignition key.

SOURCE: power steering problem when turning right

I'm not sure if that truck has rack and pinion steering, or a steering sector. In either case, it sounds like you have stuck valve and the hydraulic pressure is fighting you, instead of helping you. When ever you turn the steering wheel the valve is supposed to move and direct the hydraulic oil pressure to help you steer. The valve is built into the sector or the rack and pinion, you may have to replace the assembly. There are companies that recondition those items so you might want to shop around.