4WD Issue 2005 Yukon

[ava williams]

Just curious if anybody can relate to my situation. I have a 2005 Yukon with some 4WD issues.

Previously, when trying to engage the car in or out of 4WD, the 30A Transfer Case fuse under the hood would blow. A Service 4WD message would pop up. After replacing the fuse, the car would been the gear selected initially.

I replaced the transfer case shift motor and the selector switch on the dash. Now, the dash lights will indicate the car is in 4WD but the front wheels won't engage. The 30A fuse doesn't blow anymore and the Service 4WD message on the dash is gone.

I just replaced the front differential actuator and that did not solve my problem. Does anybody have any ideas? Thank you!

 

[Fless]

Pull the front diff actuator and let it hang. Switch from 2HI to 4HI to see if it extends. At this point you can also check power and ground at the actuator connector.

If the ground at the actuator is missing, it connects to the body mount on the frame, behind the left front tire. It's common for the two ground connections there to get crusty. There may also be a splice in the ground wire under the master brake cylinder.

You can find wiring diagrams and ground locations at www.charm.li. Let us know how it goes.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Let us know what you find.

 

[Fless]

After testing my suggested procedure above, you may need to make use of a bi-directional scanner that can read chassis (Cxxxx) diagnostic trouble codes. Such a scanner can indicate the various drive modes, as well as commanded vs. actual actuator positions.