4wd doesnt work - 2002 Chevrolet TrailBlazer

Is it cold where you are ? If so below zero Celsius your actuator is froze up. This is happening on new Toyota trucks just leave it and go for a ride to warm things up. Then it will come out and work properly.

Its automatic. AWD is different than 4WD. AWD keeps all the wheels working independently. Where 4WD keeps all wheels working no matter what. No need to worry about anything on an AWD set up. Speed doesnt matter, however in my opinion stopping and letting it kick in or out is best. Just in case a part acts up it wont do anything odd at high speeds.

Try unplugging the 4wheel drive actuator and see if it will disingage; if that doesnt work then its probably in the transfer case itself.

Hi Kamakaroots,

Being an older 4x4 you will need to manually engage the hubs aswell as move the shifter into 4x4.
To engage the hubs you will need to turn the switches on the hub/rim's themselves.

B1gR1g

4x4 motor

have the four wheel selector sensor changed(the sensor on the transfer case)

EASY FIX!

Your Schro's are going bad in the 4WD HIGH Trans Case. This sucks i know. But i had the same problem berfore.

Unit will continue to work good in low range since the stress is less then on the HIGH range. I would never use the 4WD HIGH anyway...doesnt do much on the street...just tears up the gearing and schros.

Hope this helps,

THanks,

Mark

put truck in nuetral, and foot on brake, switch 4x4 , put into fwd and let creep a few feet, see what happens,

No, mostlikely its the "transfer case actuator motor" failing to engage the 4WD mode. its located on the outside of the transfer case @ the back of the unit and mount by 2 or 3 screws usually. You may need to replace it, but if you up to it, call a few trans. shops to see if they can test it if you were to remove it and bring the motor to them for testing. Its an electric motor that in most cases auto parts stores WONT take back for return if that doesnt solve the problem, thats why i recommend talking to a trans shop about having yours tested 1st.

you will need to let the durango sit in the nuetral position without moving, then turn the knob from 2WD to 4WD. if that doesnt work, try putting the durango in reverse and then back to drive a couple times. you may have some mud/dirt/oil caked up under there interfering with the 4WD moving parts.