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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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New transfer case ecm and new actuator and front diff wont

Customer Question

new transfer case ecm and new actuator and front diff wont lock in
JA: What is the model/year of your Chevy?
Customer: 2007 sub z71
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: put in new ecm and front actuator and front diff wont lock in for*****
JA: Besides this, what condition is the car in?
Customer: great
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 months ago.
Category: Chevy
Expert:  Jake Cheek replied 11 months ago.

Hi my name is***** to JustAnswer.

So you have a new TCCM (Transfer case Control Module) and a new encoder motor (The one on the transfer case)?

Have you had the TCCM programmed? Do the indicator lights flash on the 4WD switch when attempting a shift?

I would start by checking a known chaffing point in the harness on the drivers side running above the frame between the body. It runs from the transfer case into the cab.

I will do some more research while awaiting a response.

Expert:  Jake Cheek replied 11 months ago.

I would also check the Front Axle Actuator connector for signs of water intrusion. Usually white corrosion in the plug or on the terminals.