Question about 2002 GMC Sierra

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4x4 not working

Won't come out of 4 low ,no lights on switch

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Encoder motor sensor or encoder motor disconnect battery for a full 3 minutes and retry if it shifts encoder motor sensor is out

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1 Answer

My service 4x4 light is on and it won't get out of 4lo and 2hi, allwheel, 4hi just blink

It is either the switch is going bad, the actuator is bad, or you are loosing power to the actuator. The way to find out is to remove the pan under the front end, and unplug the actuator. Use a volt/ohms meter to test the leads to it in order to make sure it has power & ground. A test light can be used in place of a meter if you don't have one. Make sure the harness is clean & making a good connection, then test to see if it powers up when the switch on the dash is pressed. If it does in fact power up, then replace the actuator. This is more than likely the problem, and you can get a new one from most any parts store for about $60+. The light on the dash will only light up if it engages the actuator. You can listen to it with the engine off, ignition switch on, and have a buddy push the switch on the dash. You should hear it make a sound as they push the button from one to the other. This is in fact the easy way to tell (usually) if its the switch, or the actuator.

Mar 24, 2012 | 2002 Chevrolet TrailBlazer

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4x4 not shifting into high

hi how are you doing? just had same problem with by gmc i replaced the transfurcase motor and it works fine. the electric motor moves the shifter in your transfurcase from 4hi to 4lo and 2hi.there is only 3 things that operate your 4x4 the switch the motor and the control modgual.

Jan 28, 2009 | 1994 GMC Jimmy

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