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Q: my 4wd want go into 4wd when i try to put it into high the light keeps flashing on 2000 GMC Jimmy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it is the push button type on the dash
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The usual problem with the 4x4 in these vehicles is the push button switch being faulty or a faulty transfer case actuator. It is best to have this diagnosed first as there may be a problem with the wiring. If you don't mind throwing parts at your vehicle I would replace the push button switch assembly first.
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