Check fluid level HOT and in park. Have you replaced trans filter and fluid recently? Ever?
SOURCE: 2000 gmc yukon xl 4x4 wont engage
$115 inparts and lobor fixed for me...see my solution posting by clicking on my name.
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: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!
Sam,
I would start with a transmission fliud and filter service.
I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.
Good Luck
Testimonial: "Thanks alot richtko94'! I'll try that!"
SOURCE: 2007 GMC Yukon Cruise Control
Check the speed sensor. Look up the location at autozone .com or google. It is either near the tranny or at the passenger side wheel. The speed sensor is almost always connected to cruise control problems.
SOURCE: 1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will
On the full size, the front actuator is electric, not vacuum.
When in 4wd mode, a switch on top of the transfer case conducts 12
volts out to the actuator. Wire #50 (brown) is the 12v feed, and it
conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.
Check voltage at the connector for the front actuator (at the
front differential - it looks like a large bullet that threads into the
front diff.) If it has 12 volts, the actuator is the problem. If it
does not have 12 volts, check the transfer case switch and the power
feed to the transfer case.
I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated
by voltage. When it heats, the pin in the end swells and pushes a shift
fork in the front differential. The shift fork engages a spline on the
passenger side of the differential, and boom! you have 4WD.
GM offered an upgrade to this actuator that is a motor instead of a
heated device. However, it requires a small harness addition, a spacer,
and a new actuator. It is about a $150 to $200 option.
If I were you, I would buy a new heated actuator. They are available at
most auto parts stores, and are about $90. They are also on eBay for
about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.
Good
luck. The actuator is usually the problem 90% of time but recheck all
of the wire harness just to maker sure there is no short before
replacing any parts.
Testimonial: "This is exactly the info i need to troubleshoot and repair efficiently complete with wire numbers and colors thanks for the help buddy"
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