Transfer case selector switch and control module testing

By tetonspark
November 27, 2019 in Duramax Diesel & 8.1L Big Block

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tetonspark

Posted November 27, 2019

Will a service 4wd message appear if the selector switch or cm are defective.

1 month later...

Meckmonkey1

Posted January 6, 2020

Pretty darn sure it could be the ground wire underneath the drivers side just behind the front wheel or where the transfer case wires cross over the top of the front u joint. It is worth a look.

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