Check your grounds on the frame located under the driver door by the body mount first on 2000 to 2006 models. They tend to rust up north. Then the 4wd switch on the dash is the next thing to check. When both those are fine its normally (in my experience) the encoder motor ring inside the encoder...
So I'm at a loss right now with my Tahoe. I have a rear main seal leak and it's been leaking into the encoder motor. I cleaned and replaced the encoder ring once I found the issue but since doing so my tahoe kicks into 4L on it's own when starting the vehicle and putting it into drive. I have...
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