4WD Issues !!!please help!!

[josejuan_602]

hii guys first of all let me thank you for taking your time to look at my topic!

 

 

i have a 2003 gmc sierra SLE 4x4 a few days ago the "4WD SERVICE" light came on i try everything to reset it but it keeps on flashing everytime i turn my truck on ever since that my ABS/ PARKING BRAKE keeps flashing as well i took it to a mechanic nd it scan the codes on it wich it had plenty i dnt have em but i can get them tomorrow or so bottom line he told me i needed to replace the "transfer case control module" nd the "transfer case shift encoder motor"

the problem is this guy its charging me

 

1300dlls

 

 

to do the repairs wich i thought i was alot of money ive been doing some research on the web and i found out that none of this are hard to replace i can do it my self my only problem is he said i would have to reprogram the TCCM can you guys help me out here!!??

 

 

 

 

do i need to program the transfer case control module after replacing it??

 

 

do u guys know any website where i can get this parts for cheap??

 

 

 

 

thank you so much guys for any help everything is well appreciated!

 

 

 

 

[gmtech4]

first off,dont post twice for same issue in different forums,Ryan hates that !!

 

 

second,,,your tech has not supplied codes for you ,,he is throwing parts at your truck with a moduale and an encoder motor,,and btw ,we change just the sensor inside the motor assembly not the whole thing

 

so slow down a minuite and give me the codes ,i step at a time ,,

 

 

off to work i goooooo

[josejuan_602]

sorry for posting it twice it just that i wasnt sure if i was posting it in the wright topic!nd he did provide me with a list of codes but i lost them i talk to him and he told me he told me he'll give me the codes again if i take thetruck to him tomorrow bcuz his too busy today his a really good mechanic i trust his judgment but hi is also pricy if i take my truck to autozone do you think theyd be able to provide me with the codes?

[gmtech4]

yes

[josejuan_602]

first off,dont post twice for same issue in different forums,Ryan hates that !!

 

 

second,,,your tech has not supplied codes for you ,,he is throwing parts at your truck with a moduale and an encoder motor,,and btw ,we change just the sensor inside the motor assembly not the whole thing

 

so slow down a minuite and give me the codes ,i step at a time ,,

 

 

off to work i goooooo

 

 

 

 

okayy so i went back tho the mechanic and run the codes but this time only C0306 came up thatz the only code that i has right now last time he check it had a whole bunch but he erased them all nd after a week or so this code is the only one that came up!!

my 4WD works flawlessly it engages nd disengages like a champ 4HI/4LO/AUTO4WD lights all work properly now i ask for your help!! whatz ur opinion???

[gmtech4]

"This DTC detects an open, short to voltage, or short to ground in the motor control A or motor control B circuits, or an open, or short to ground inside the motor."

 

its fine now and above is the discription of what the code is finding ,but its not doing it now ,,,,,,

 

when it does it again,have it diagnosed ,,,,,there are to many things it can be ,guessing is not good ,,

[josejuan_602]

"This DTC detects an open, short to voltage, or short to ground in the motor control A or motor control B circuits, or an open, or short to ground inside the motor."

 

its fine now and above is the discription of what the code is finding ,but its not doing it now ,,,,,,

 

when it does it again,have it diagnosed ,,,,,there are to many things it can be ,guessing is not good ,,

 

what if i jst replace the transfer case encoder motor or shift motor would this fix the problem??? nd if so its changing the encoder motor jst taking the old one off nd plugging the new one in?? or its there more stuff to it?? also my ABS/PARKING BRAKE light keeps flashing on nd off is this whats causing it? or it might be somthing else like i said my truck has no codes what so ever besides th C0306 no check engine line nothing!? thank you for your help in advance!

[markw8]

It's not usually a good idea to just throw parts at a problem and hope you get it on the first try. If you miss, you've likely already spent enough to have it correctly diagnosed and still don't know whats wrong.

 

Mark

[gmtech4]

abs lights well.....are for the abs system

 

encoder motor assembly is rather expensive and is a plug and play

 

the reason you are not getting abs codes is the code reader is a POS and cant read them

 

do what ya want bud ,im out

[redneck01]

ok i dont know if this will help but here goes, im in canada and had the same problem 4wd would work then not then it was stuck in 4hi 4wd service light came on. my control box is on the pass sid kick panel, i took a look and the conectors for the 4wd had coroded so bad i was not getting a signal to the transfer case so i changed the conectors. $11 bucks and I had the thing working like new. take a look its worth a try.

[titen201]

I’m no expert by any means; I can just tell you what I did to get my FWD running again. I have a 2000 Chevy Silverado, Extended Cab, and Long Bed with 180,000 miles. I bought the truck about one an a half years ago or so, and the FWD didn’t work back then. So, last summer I started working on it. I did just as you have done, and looked it up on the internet. I went to a number of different sights hopping I could find a quick fix and save a lot of money. After reading I found things I could do with the help of youtube videos. I did the following:

1. Looked for a blown fuse. I only found one fuse that said FWD, and it was the one on the inside of the cab. Looked good. So that wasn’t it.
   
2. Changed the selector switch. You know the push button thing, in the cab. This wasn’t it either.
   
3. Changed the actuator. Nope not it.
   

 

By this time I was not too happy; therefore, I did the unthinkable, I took it to the Chevy Dealer. After all having a FWD truck, but the FWD doesn’t work, just don’t seem right. Kinda got my feelings hurt when they said “$100.00 dollars an hour.” No thanks. So, I did without the FWD last winter. Luckily, it wasn’t a bad winter.

So, before this winter, I was bound and determined to get it working come hell or high water the things gona work. After replacing all the parts last year and it still didn’t work, I knew it had to be electrical.

I found a web site that has all the electrical information for my truck or any vehicle for that matter. It’s called alldata.com. Granted, I did have to pay like $25.00 for a year, but I did it anyway. And, low an behold, there is a fuse. It’s not labeled FWD, its labeled ATC. (Automatic Transfer Case) It’s under the hood with all the other fuses. So, I don’t know what the actual problem was or how the fuse got blown, all I know is after doing all the steps above and replacing this fuse, it’s working. I just had to try them all, I guess. Good Luck!!! And thanks everyone that posted on here. IT WORKED. I don’t know which one done it, and don’t care. I got my FWD back.