4x4 not engaging

Hi,

Chances are the front electric actuator motor on the axle is bad. Before replacing it, confirm there is power to it. If there is power and it doesn't respond, replace it. If there is no power, then suspect the encoder. Please keep in mind, there is most likely a diagnostic trouble code stored in the computer related to the issue. You may want to have the computer scanned with a scanner capable of reading such codes.

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Here are a few links you may find helpful when testing:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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2002 Chevy Truck Avalanche 1500 4WD V8-5.3L VIN T
Electric Motor Actuator Replacement
Vehicle Transmission and Drivetrain Differential Assembly Service and Repair Procedures Front Drive Axle Electric Motor Actuator Replacement
ELECTRIC MOTOR ACTUATOR REPLACEMENT
Electric Motor Actuator Replacement

Removal Procedure


pic 1


1. Raise the vehicle. Refer to Vehicle Lifting.
2. Remove the front differential carrier shield, if equipped.
3. Disconnect the electrical connector from the actuator (3).
4. Remove the electric motor actuator (3) by turning the actuator counterclockwise.

Installation Procedure


pic 2


1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads of the electric motor actuator.

Notice: Refer to Fastener Notice in Service Precautions.

2. Install the electric motor actuator (3).
^ Tighten the actuator to 20 Nm (15 lb ft).
3. Connect the electrical connector to the actuator.
4. Install the front differential carrier shield, if equipped.
5. Lower the vehicle.

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Let me know if this helps.

Take care,
Joe

I will check it out tomorrow and let you know. thanks Joe.

I took it to a shop where I was having my brakes done, and ask them to check out It out and they found the transfer case and front actuator and both had power and functioning. The only other thing they said it could be is that the actuator fork is broken off, or I have some front differential issues. I’ll be taking off the skid plate and Front actuator this weekend to narrow it down a bit.

It could be the fork, if the actuator is working. Keep in mind it is an electric motor. It could have power and not run.

Let me know what you find.

Joe