Offroad Trailblazers and Envoys

4wd only in neutral.......

Something not working right?

by nodak » Tue Jan 26, 2016 9:17 pm

Been a while since I've been here but I need help. My TB has 4wd works like this.
Start in 2hi in gear
Turn swith to 4hi and light is right but service 4wd comes on and no 4wd working.
Put in park, turn off then restart and service 4wd is off. Put in neutral and shift to 4hI,put in gear and it worked
Start in neutral again and shift to 4lo. Put in gear and works

Seems as though if I'm in gear I cannot shift on the fly anymore. I'm would assume my encoder motor is just weak and needs replace.

What do you all think?
Posts: 6
Joined: Tue Sep 15, 2009 11:41 pm
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD

by Jrgunn5150 » Tue Jan 26, 2016 9:19 pm

Have you gone through the flowchart? ... wd-system/

The encoder motor does seem like a possibility though.
User avatar
Posts: 1128
Joined: Fri Jan 09, 2015 1:49 pm
Location: Ionia, Michigan
Name: Jr.
Vehicle Year: 2006
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD w/ G80
Rank: Trail Ready

Return to Troubleshooting