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Good Evening, my 1997 GMC Suburban transmission started slaming into gear and code 1846.

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That code is for an encoder motor(shift motor) on the transfer case.Not difficult to change but expensive to buy(200 dollars).Check all the wires and make sure none are nicked and that everything is plugged up good before replacing.You will need to remove front drive shaft to get the encoder motor off the transfer case.The hard shifts are due to a limp condition set by the code being stored.

Posted on Mar 27, 2011

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