2005 GMC Sierra 4 wheel drive

2005 GMC SIERRA
175,900 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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J88SLIM
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  • 3 POSTS
I have a Sierra 1500 4wd and it don't work when u push the 4 hi or low button or the anytime 4wd. it does not engage when the vehicle is on there is no lights on the switch but when the vehicle is turned on the switch will light up and then turn off. it doesn't even tell u if it's in 2 wheel drive there is also a message on the consul saying service 4 wheel drive. I check all fuse and there okay, it drives and it is in 2 wheel drive how I know is it snowed here a couple weeks ago and I tried to put it in 4wd but got stuck and the only thing spinning was the rear wheels.
Dec 29, 2014 at 8:29 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
scan for codes but it may be the encoder motor on the tcase.but see what the scanning will bring up if anything.
Dec 29, 2014 at 9:31 AM
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J88SLIM
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  • 3 POSTS
They did a code scan and nothing came up
Dec 29, 2014 at 9:41 AM
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HMAC300
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  • 48,601 POSTS
then go under rtruck and see if encoder motor is getting power to it when you switch the switch. also check fuse an drelay under hood fuse box.
Dec 29, 2014 at 10:28 AM
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J88SLIM
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  • 3 POSTS
Ok question how do u check a relay
Dec 29, 2014 at 10:35 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
look under how to repair electrical an drelay it will tell you there.it's onour site here
Dec 29, 2014 at 12:02 PM