2004 GMC Yukon 4 wheel drive service light and vibration

Tiny
JACKSONPG15
  • MEMBER
  • 2004 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
I have a GMC yukon xl that I recently purchased from a local used car dealer. He has been good about getting the issues taken care of but the mechanics he likes to use just throw parts at the problem and do not thoroughly diagnose the problems. I have a service 4wd warning that shows up on the dash and it might go away just by shutting of the vehicle and restarting or by unhooking the battery. But when it comes on the vehicle is stuck in 2wd and is not good when you live in North Dakota and have over 2 feet of snow on the ground. Is there anywhere out there to buy a code reader for the 4wd system and what may be causing the warning? The shift motor was the last thing that was replaced on the four wheel drive. The front differential was also rebuilt due to a bearing going out and causing a large amount of filings to accumulate in the differintial. And they where hoping that would take care of the vibration that happens when you reach 70 MPH all the way through to 80 MPH. Once you reach 80 MPH it seems to go away but can be felt again once it slows to 79 MPH. So any ideas on this? The tires have been balance twice by two differnt shops.
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Saturday, January 9th, 2010 AT 9:33 PM

5 Replies

Tiny
MERLIN2021
  • EXPERT
If you have an Auto zone or Advance auto parts nearby, They read codes for free, or buy a scantool, they are cheap enogh and read codes from 96-present. Good investment. Post code(s) here, this is our starting point!
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Sunday, January 10th, 2010 AT 3:39 AM
Tiny
JACKSONPG15
  • MEMBER
I have a scan tool for 96 or newer vehicles but it only reads engine codes. I checked out our local o'reilly's (since we do not have an advance or autozone store) and they have the same code reader I have. Any idea about the vibration that happens between 70 and 80 MPH? Thanks
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Sunday, January 10th, 2010 AT 10:31 AM
Tiny
MERLIN2021
  • EXPERT
Have the engine and tranny mounts looked at, especiallt the trany tailshaft mount. Is the diff OK after the rebuild?
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Sunday, January 10th, 2010 AT 10:50 AM
Tiny
JACKSONPG15
  • MEMBER
I will have to look into that. I would assume the front diff would be ok after the rebuild if it was rebuilt. I am kind of wondering if the dealership I bought it from is telling me the truth or not. But I am going to do some checking on my own since I am competant at doing some pretty serious repairs to vehicles. I just don't have a big enough garage at home to work on it. I will be taking it into my employers shop sometime this week and getting under it to verify what they said was repaired is repaired. So I will be in touch. Thanks
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Sunday, January 10th, 2010 AT 10:24 PM
Tiny
MERLIN2021
  • EXPERT
OK, I'll be checking back on this.
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Monday, January 11th, 2010 AT 2:14 PM

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