Question about 2001 GMC Yukon XL
There are 4 things that could be the cause, the switch, the module, the encoder motor on the transfer case or a problem with the Antilock Brake System [ this is how the auto 4wd system gets it's operational infomation ]. The only realistic way to pinpoint the problem is to scan the 4wd system with a good scanner.
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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