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Four-wheel drive will not work?

Tiny
JACOB MARINO
  • MEMBER
  • 2003 GMC SIERRA
  • 5.3L
  • V8
  • MANUAL
  • 250,000 MILES
There is a panel to the left of my steering wheel with 4 high, 4 low, and 2 high. I'm not sure what it's called but no lights are showing up and I looked in the manual for instructions on how to use it and nothing worked. This is my first truck, and I don't know how to use any of this. Is there a reason that it won't work? And could you explain what it does for me please?
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Sunday, March 26th, 2023 AT 6:38 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The first thing you must do is check the fuse TREC in the under-hood fuse panel and the fuse 4wd in the interior fuse panel here is a guide to help. I have included the fuse locations as well.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

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Monday, March 27th, 2023 AT 10:01 AM
Tiny
JACOB MARINO
  • MEMBER
  • 44 POSTS
So, it's been a while but I found a fuse that was blown that had to do with the transfer case, so I fixed it. The transfer case switch lights came on but the buttons did nothing and a service 4 wheel drive light displayed on the dash.
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Sunday, April 30th, 2023 AT 3:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Monday, May 1st, 2023 AT 10:15 AM

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