Service 4WD

[Electrichorseman]

A few months ago I had a problem with the "Service 4WD" showing up on the console of my 2003 Yukon. I found the post regarding changing the four wheel drive select switch...

http://www.tahoeyukonforum.com/forum/showthread.php?t=23246&highlight=service+4wd

I saw that a number of people had luck with replacing this switch and the problem went away. I gave it a try but the problem persisted. I brought the vehicle to a dealer for service. Fortunately a very good friend of mine works for the dealership and he helped to make sure that I was treated fairly. The service ticket read as follows...

"90188 tech found CO327 encoder motor sensor tech removed motor"
"pulled apart to replace position sensor flushed T case"

The part was a "88962315" sensor

The transfercase flush was something they recommended since I have 90,000 miles on the clock.

The problem is gone and unless it's my imagination, the truck rides better.

There is a really good post on the "Full Size Chevy" board which shows pics of the sensor being replaced...

http://www.google.com/url?sa=t&sour...OY47ELsxcF22z2HfQ&sig2=SDPopyOwSXJIwkMZxuILpQ

Hope this helps.

 

[bigmike75]

Where did you find this switch? Apparently for 2003 Yukon XL's (what I drive) the only part available is a GM one. The part number is 15136040 and it's $116!