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Q: ABS light pops on and power loss the truck will run 50 mph on 2002 GMC Sierra 3500

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I have a duramax 6.6 and once I drive for about a mile the ABS light pops on and the truck down shifts, bringing my speed down to about 55 mph. I have been told something about slack in the transfer case and then he change to something else not sure of this guy.
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Before replacing any parts on your 2002 GMC Sierra 3500 I would recommend to have the fault codes stored in the ABS controller read and diagnosed. That should lead to the cause of your ABS light turning on.
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