4X4 problems - yeah I've seen the other posts

[denise2580]

I have had the same problem, seems like most folks can't get the 4wd to engage but my blazer has a mind of its own and really like 4wlo. I didn't really think it was a vacume problem since it would pull in by itself and not want to come out. I can't seem to get a reading on the scanner, I think the same reading you received. So I decided to try the cheapest fix for the symptoms which is to replace the dash switch. If not I am only out $7.00. The other choice is tccm which is NOT $7.00! This has been a pain in my
*%**Y# for a while now but my 2000 blazer is not my major mode of transportation I have a 2001 without 4wd for that! So needless to say I am a slow worker, I think about my problems before jumping in on them. I have purchased all the gm service manuals to read about the job and talked to alot of people, mostly on this forum! I am very interested to hear about your blazer so I will keep watching to see the outcome! The only real information I have is that this is most common with the late 99 and 2000 blazer and that this is one of the most complicated areas diagnose and figure out! For now I just drive it when I want to without the ATC fuse under the hood and we are all good! Good Luck!

[JimmyGold]

Yeah, well I'm going to find the TCCM at my leisure. This was ths fix for the same symptoms 3 years ago...at any rate I'm ordering it from someone in Utah who got a control arm for $25 dollars. I'll see what she has; in the meantime I'm driving without the ATC switch under the dash also. I should have an update in a few days.

[JimmyGold]

Hi Denise2580,

I promised I would post on this again. I did buy a used TCCM (15748800) for $180, I ordered from a junk yard in VA - but I never installed because after seven years I finally traded in the vehicle. If you're interested in the part hit me up. Thanks!