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I have a 2007.5 (new style) GMC 2500HD 4X4. The transfer case shifter motor failed and I replaced it with a used one, the used one was tested and proven to be good. Once installed on my truck the t-case shifter motor will not work. Is there some programming that needs to be done before the motor is recognized and will operate?
 

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Did you check to be sure you are getting voltage to it? A lot of cold climates aka in the salt belt are known to cause electrical problems with electronic transfer cases. Corroded connectors and wires are the most common.
 
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