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Its 03 GMC Yukon. The 4wd service light came on the other…

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Its 03 GMC Yukon...

Its 03 GMC Yukon. The 4wd service light came on the other day, now there is now indicator light on the 4wd dash buttons and the 4wd is not working. I tried replacing the awitcjbon the dash and didnt solve it.

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

O have checked all fuses that seem related to 4wd. I don't think it is the bulbs since the new one is the same way. Is there a fuse associated with the 4wd that is not labels "4wd"?

Mechanic's Assistant: Are you fixing your Yukon yourself? What have you tried so far?

I am fixing it myself. I have tried replacing the dash switch and checking fuses labeled 4wd.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I don't think so.

Submitted: 9 months ago.Category: GMC
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Answered in 21 minutes by:
9/13/2017
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 16,246
Experience: have owned a repair shop for 25 years
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Hi, My name is ***** ***** for the delay.
I will do my best to assist you.

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

when you use the switch does any of the indicator lights on the switch come on or flash?

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

what engine do you have?

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Customer reply replied 9 months ago
5.3
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

when you use the switch does any of the indicator lights on the switch come on or flash?

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Customer reply replied 9 months ago
No
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

do you hear a clicking noise when operating the switch?

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Customer reply replied 9 months ago
the normal button-pushing click.
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

ok

have you scanned the computer?if so,can you give me the trouble codes?

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Customer reply replied 9 months ago
I have not
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

ok..

you need to scan it to get the codes..

how and when did this problem first begin?

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Customer reply replied 9 months ago
Just driving on some muddy roads last week, it worked fine, then the service light came on and next time I drove there was no light to the buttons.
Customer reply replied 9 months ago
I will try to get codes tomorrow.
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

ok

the first thing you need to do is to scan it to get the codes.

without the codes i can give you my thoughts..

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

firs disconnect the tccm[transfer case control module] and clean the connector terminals with electronics parts cleaner,these can get dirty and cause this problem

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

check the wire harness at the transfer case where it plugs into the shift motor,again clean those terminals also

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

but the problem may be that the tccm needs to be reprogrammed,,a dealer can do this in less than 30 minutes

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Customer reply replied 9 months ago
OK, that gives me a place to start. Thanks!
GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

with all that done and if you still have the problem,i would think the problem is the shift motor/actuator..this is located on the side of the transfer case,,these will sometimes just get weak and cause this problem

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 9 months ago

PLEASE COPY AND PASTE the link below to your browser, I have uploaded more info on this there. please copy and paste the link below to your main browser[INTERNET EXPLORER ,Chrome or Firefox.]

.

https://www.dropbox.com/s/ma8e3lblksmjebh/0913-gmc-File%20In%20Section.doc?dl=0

.

if the link doesn’t work that way, try it this way

thanks

.

www.dropbox.com/s/ma8e3lblksmjebh/0913-gmc-File%20In%20Section.doc?dl=0

.

If you are satisfied with my answer, Please Rate my answer by clicking the rating button so I can get credit for my work. I’m not always going to be giving you good news, so please don't let this stand in the way of you accepting my answer. .it does not cost you more money and we will still be able to communicate, ,.please understand, i can not see, hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated.. if you are not satisfied with my answer, please do not leave bad feed back ,i will gladly opt out and let another expert handle the question. .if i have sent any diagrams, please print them. .sometimes you may need to right click the image [,then save picture as]to save it to your computer so you can open it with your picture program...Please ask if you need more help

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