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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

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it is the push button type on the dash
(1) Answer
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.