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Re: 2001 blazer auto 4x4 shifts on its own
Welcome to AF on your first post.
It is all computer controlled.
You need to get it on a engine/transmission /transfer case scanner and see what is going on.
A good scanner will show codes and run a lot of test to see what the problem is.
With out a scanner about the only thing you can check is the wiring and wiring plug in and fuses.
If you get any transfer case or transmission or engine codes post them back.
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Remember proper testing gives us the answer to many problems.
MT
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