4x4 wd

[grego10r]

hi guys i just have my servis 4wd on did chek the code and thisis what i got anyone knows what dose it mean its not in my book #U1026 thanks for anyinfo

[tempfixit]

Here is a link for code definitions:

http://www.iequus.com/support/obd2_definitions.php

code definition:

U1026 GM Loss Of Active Transfer Case Control Module Communications

[sierra99]

Originally Posted by grego10r

hi guys i just have my service 4wd on did check the code and this is what i got anyone knows what dose it mean its not in my book #U1026 thanks for any info

I had the same trouble with the service 4x4. What happens when you push the buttons from 2wd to 4w hi and then to 4wd low??? Do they go in each mode?? Mine did not and would go back the the last mode (which was 2wd, in my case). I searched on here and then looked to wards replacing my 4wd switch in the dashboard. (left of the dashboard). I was surprised to see that when I took the switch completely apart and could see the actual circuit board that it looked good. But when I look further and then push on one of the buttons and then looked at the circuit board again, I could see a hairline crack in the solder weld. Pulled out my solder gun and re soldered all of the joins again. Never had another problem again. 148,000 miles now and still running, never had a service 4dw since then.

That is the easiest and cheapest trouble to look for. I would not buy a new switch, fix yours, very easy.

Hope this helps.

[j cAT]

Originally Posted by grego10r

hi guys i just have my servis 4wd on did chek the code and thisis what i got anyone knows what dose it mean its not in my book #U1026 thanks for anyinfo

when posting give vehicle year and type, also all the issues with the code found...

In your case I can only say the computer is not happy with the communication checks to/from the auto transfer case...

with this it could be the auto transfer case control module, or any wiring/connectors ....so what else is occuring besides the 4wd light on..

[grego10r]

its 2000 1500 5.3 l auto 4wd my 4x4 its stock in 4 auto now when i take the fuse it go back to 2wd i did have transfercase rebuild 5 months ago whit new tcase motor put in last nite i was drive in the snow whit 4x4 auto on the light 4wd servise came up and when i pressd 2wd the orange light went off and now its stock in 4wd auto it wont got back to 2wd only gose back if i take the fuse out

[j cAT]

Originally Posted by grego10r

its 2000 1500 5.3 l auto 4wd my 4x4 its stock in 4 auto now when i take the fuse it go back to 2wd i did have transfercase rebuild 5 months ago whit new tcase motor put in last nite i was drive in the snow whit 4x4 auto on the light 4wd servise came up and when i pressd 2wd the orange light went off and now its stock in 4wd auto it wont got back to 2wd only gose back if i take the fuse out

you need to get the DTC from the drive train..this requires a scanner that can access these codes, not all scanners can do this..then report the DTC....

since it was rebuilt check all wiring /connectors for condition and security...check fluid level and condition...is the fluid blue or is it dexron III, IF IT IS RED THEY put the wrong fluid in it..TRAC II fluid is the correct transfercase fluid to use..

this is the same vehicle I have..

[grego10r]

well i going to the shop that did the rebuilt the guy sed when they did it he will fix it for free if i get any problems hope he keep his word and thank u all for help

[grego10r]

just a update went to the guy who did my transfer case and he sed my control module is bad he will let me know how much is the new 1 but any of u guys know howmuch control module are its 2000 silverado 4x4 5.3 l thanks all