Sorry if this has been discussed a lot here, but I've been searching for a couple hours now, and still can't get a definitive answer..

My problem is that when I try to switch into 4hi lock, or 4low lock, the light just flashes several times, but does not switch out of AWD.

Anyone know whats going on here and how I can fix this?

 

Its been forever since I needed to use mine, but try putting it in neutral with your foot on the brake & then pressing the button.. Same to take it out.. It wont switch in park or in gear if my memory is correct.. Again it has been a while , but I think that should get you in & out... J

 

Thanks for the reply man, but that is definitely not the problem.. I have been attempting it in neutral with no luck as well

 

You probably need a new encoder motor aka shifter motor. Its mounted the the side of the transfer case. Its and easy job, however its not a cheap one.

 

Yea, I've looked up the price for one, and its about $173 from my local Oreilly. I wish I had a wiring diagram of the system so I could make sure thats the case before I just buy one since you cant return electrical parts if they have been installed.. Anyone have a schematic of the 4wd wiring? I looked for a fuse in the fusebox under the hood by the battery but didnt see a fuse that I thought would pertain to this problem.

On a side note (maybe related?) my TCS and ABS lights are on. I am pretty sure thats due to a faulty wheel speed sensor since that same exact thing happened to my buddy with an avalanche. Would that perhaps prohibit it from going into 4WD lock?

 

YES!!!!!!!!!!!!!!.... i had the exact same problem and i replaced the driver side wheel bearing and it comes with the abs sensor and the ABS light and (TC) light came off and now it shifts into 4 low and high lock!...

 

Yea, I found that out as well actually.. I replaced my d/s wheel hub a couple weeks ago and that cured the issue. But then led to another problem unfortunately. Now after driving a little bit, the traction control kicks in for no apparent reason, then shortly after that the ABS, TC, and parking brake light come on and display reads "Service Brake System"

I tried the fix listed in the bulletin, and it still does the same thing

 

this is the link to the problem.. forgot to add it in my post. I cant figure out how to edit my last post either..

https://www.hummerforums.com/forum/s...ad.php?t=16305

 

Could you please tell me your trouble shooting procedures and how you came to the conclusion of that exact hub please?

Thank you,
Jay
Cell. 206.226.8496. Text message also.

 

I recently purchased an 03 hummer and had the same issue I had turned off my vehicle had the ignition in the on position and the vehicle was in neutral. I pushed the 4hi lock button and the system engaged, After it engaged I hit the 4 low lock button and it engaged. I cranked the h2 and it was definetly in 4 low. Obviously something is wrong but it did cycle to 4 hi and 4 low when I did this.