2005 GMC Sierra 4 wheel drive

Tiny
J88SLIM
  • MEMBER
  • 2005 GMC SIERRA
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 175,900 MILES
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.
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Monday, December 29th, 2014 AT 8:29 AM

5 Replies

Tiny
HMAC300
  • EXPERT
Scan for codes but it may be the encoder motor on the tcase. But see what the scanning will bring up if anything.
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Monday, December 29th, 2014 AT 9:31 AM
Tiny
J88SLIM
  • MEMBER
They did a code scan and nothing came up
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Monday, December 29th, 2014 AT 9:41 AM
Tiny
HMAC300
  • EXPERT
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.
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Monday, December 29th, 2014 AT 10:28 AM
Tiny
J88SLIM
  • MEMBER
Ok question how do u check a relay
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Monday, December 29th, 2014 AT 10:35 AM
Tiny
HMAC300
  • EXPERT
Look under how to repair electrical an drelay it will tell you there. It's onour site here
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Monday, December 29th, 2014 AT 12:02 PM

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