4wd won;t engage - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > AWD Drivetrain

AWD Drivetrain AWD repairs & problems

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Old 01-09-2019, 08:35 PM
V8Envoy V8Envoy is offline
Junior Member
2003 GMC Envoy SLT XL
Black 5.3L V8 4X4
Join Date: Mar 2013
Location: Oh
Posts: 20
I have a 2003 Envoy XL Slt 5.3 128000. I had the same issue. I replace the encoder motor. I purchase the part from ebay and installed it myself. Two bolts and your done. I was good to go and no more cycling on the selector.
Hope that helps you.
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Old 01-14-2019, 09:12 PM
TechNova TechNova is offline
Junior Member
Join Date: Dec 2018
Posts: 4
This one is causing my troubles. I checked the wires at the front axle actuator again, I have 12V at the brown wire with key on but cannot get 12V to the lt blue wire.
I have easy access to used parts so I tried another tccm that is located behind the light switch under the dash.
still same result, no 4wd.

This truck is really clean for our area but I still decided to clean the grounds on the left side of the engine. The terminal looked great even before I cleaned it.
The wires are good and the connectors do not have any bent terminals or corrosion. I still have no 4wd.

Any other suggestions? I am running out of ideas to check.
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