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2005 Sierra 4wd Shifting

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New User

Feb 18, 2017, 4:50 PM

Post #1 of 3 (391 views)
2005 Sierra 4wd Shifting Sign In

Is it possible to install encoder motor in transfer case wrong? I installed a new encoder motor but will not operate in 4wd low and 4wd high. It will run in 4wd auto and 2wd. If it is installed wrong, how do I fix it?
Truck and a new button selection switch and new transfer case control module.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 18, 2017, 4:55 PM

Post #2 of 3 (389 views)
Re: 2005 Sierra 4wd Shifting Sign In

Sounds like you just threw a bunch of parts at it and never actually diagnosed the problem.

Did you try to pull codes from the TCM?


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

kev2 profile image

Feb 19, 2017, 8:28 AM

Post #3 of 3 (357 views)
Re: 2005 Sierra 4wd Shifting Sign In

Yes it can go be installed wrong - TC in N and Encoder indexed
what were the codes that had you R&R encoder ?
what are the current codes? All codes as a seemingly unrelated code may be root issue.
As colleague mentioned these are not the often seen P series but "C" codes and a few "B" type.

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