Assuming transfer case OK, what are the most obvious reason why doesn't go into 4WD

Asked by Jan 05, 2016 at 02:54 PM about the Chevrolet TrailBlazer

Question type: Maintenance & Repair

Vehicle has great appearance.  No signs of abuse.  It won't go into 4WD.

3 Answers

240

Body Control Module

92,695

Stuck transfer case motor is the most common, sometimes you can lightly tap on it while someone is pushing the switch or knob, if you hear it run then you have found the problem. Note this must be done on level ground and no load on the drivetrain at all due to the motors weakened brushes it may not have enough power to switch gears if there is any load on them. HTH

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Listen to Tennisshoes, he knows his stuff.

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