Transfer case acuator

[Sierra5.3]

My service 4wd light kept oon coming on intermitently and it just stays on.. I have replaced the switch before, and it solved my problem.

 

But its not the problem this time... When I press the button to shift it into 4wd.. the transfer case accuator motor buzzes a couple times and then stops doesnt shift it into anything.. We ran tests and got a new one, but its doing the same exact thing..

 

 

Please help!!!

[Blue-2001-Z71]

As I recall the transfer case shift module is the 2nd likely cause of failure. Is this what you replaced already? That's the pricey one at around $300.

[Peter_C]

Get the rig scanned. There will be a code saved in the computer.

[Sierra5.3]

I replaced the 4wd switch on the dash when it went bad last year..

 

The transfer-case accuator was replaced.. but the transfer case wont shift still... the accuator is turning but the transfer case wont.. and the accuator has tension on it from trying to turn the transer-case switch ..

 

plus the switch on the transfer case is hard to turn by hand

[sub5]

I have the identical problem with my 99Sub, but my 4wd Auto works. just the 4Hi & 4Low that doesn't want to work. I hear it engage especialy in 4Low but no drive to the front wheels. I haven't had time to look at it yet and only will in a few weeks. I'm putting it away for a few months to do work on it such as lifting, new brakes and other toys added to my truck. I'll be reading this post to find out what you discover. If I find the problem on my T-case I'll post it.

 

John

[Sierra5.3]

Yea, I had it go into auto and then back into 2wd, but now its in 4 wheel high and wouldnt go out.. NOw its stuck in 4-wheel low and when you go to shift it out it buzzes and the light flashes on 2wd and then all the lights go out ..

[Schwag]

If your truck is stuck in 4-hi or Auto after changing the switch, it's most likely the Transfer Case Control Module.....

 

just had mine replaced, cost me $540 and some change...

 

save yourself some dough, get one from gmpartsdirect for $200 and have it installed by a mechanic beneath the dash.

 

GM part # 12577410

 

my loss is your gain

 

have a good day,

 

 

 

 

-steve

[Sierra5.3]

It was stuck in 4wheel hi and now 4 wheel lo..

 

is there any way of checking to see if the transefer case control; module is bad??

[Sierra5.3]

Update:

 

We switched transfer case control module from my dads Yukon xl and it didnt solve the problem, same buzzing noise coming from the accuator from trying to shift the transfer case. If you try it a couple times it blows the atc fuse under the hood, so the last thing I can think of is the transfer case itself it to blame..

[Schwag]

well, I tried...sorry.

 

up to this point most if not all of the late gen trucks will have electrical issues.... hopefully your case is an isolated one. You'll do good to get out of a transfer case rebuild for under $700.

 

Good job isolating the issue... I'd like to hear what the mechanical failure was... 5 years may be all the Autotrac can take....

 

-steve

[Sierra5.3]

New Update:

 

I decided to run one more test before I pulled the transfer case..

 

I pulled my dads yukon xl into the garage and pulled off his accuator and put it on my truck... I was able to get it on and it shifted into 2wd, it didnt make any motor noises or anything

 

So therefore gmpartsdirect had sent me a defective transfercase accuator.. I sent them emails, but I was unable to find a number, anyone??

[Schwag]

Click on "Site Policies" at the bottom of the home page for product return info..

 

 

Flow Chevrolet at 336-760-7000 operates the site....

 

 

an exchange at a dealership may be an option....

 

-steve

[maroonsilverado]

had the same problem in my 99. except it got stuck in 4HI 50 miles from home......talk about a LONG trip on gravel staying around 30 mph. went to the local dealer and priced a new actuator. they only wanted $500 for the part and $200 to put it on.

 

 

long story short i knew a guy that had an extra transfer case lying around. i bought the part off him for $25 and installed it myself. it's working to this day and that happened a little more than a year ago.

[dmilacek]

I am unsure which transfer case actuator encoder motor to purchase. I have a 1999 new body style Silverado with a 246 transfer case and the NP8. On the outside of the actuator case it is stamped 2787367A396 and on the black actuator 9902102. Can anybody help; there are a lot of different ones for sale?