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Can not get my 2015 GMC out of 4wd high

Tracy Zoller
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Tracy Zoller New Member

Tracy Zoller

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I replaced the Transfer case switch. I hear no noise when trying to turm dial to 2wd. Only light that will come on the dial is 4wd high. I have disconected baterrie put into newtral then tried the past 4 low to take it to newtral but it just stays in 4wd high.  would my next best bet be to buy a new transfer case motor?   

rav3 Senior Enthusiast

rav3

Posted
Posted

Just guessing but your TC Actuator is not working. Could be a bad ground, bad connection or bad actuator. Just my opinion 

Several videos on this on YouTube 

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  • Tracy Zoller changed the title to Can not get my 2015 GMC out of 4wd high
Tracy Zoller New Member

Tracy Zoller

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44 minutes ago, rav3 said:

Just guessing but your TC Actuator is not working. Could be a bad ground, bad connection or bad actuator. Just my opinion 

Several videos on this on YouTube 

 

sk Senior Enthusiast

sk

Posted
Posted

There was a TSB for this a long time ago, but unfortunately I don't have the number anymore.

Ask your local GM dealer to look through the system for it (doesn't have to be a GMC dealer - just any GM dealer service department).

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PhilB Enthusiast

PhilB

Posted
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This is what ChatGPT replied with when I asked for the tsb:

 

GM TSB / Service Update Bulletin Number: 14616
Also referenced as: Service Update for “Service 4WD” Message – Transfer Case Stuck in 4WD HI
This bulletin addresses vehicles equipped with RPO NQH transfer case and provides a procedure to reprogram the transfer case control module to help resolve the stuck-in-4WD issue.

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rav3 Senior Enthusiast

rav3

Posted
Posted

SB-10090217-2280.pdf https://share.google/Uw9HY5OSBGDCcl2nX

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Aturek Enthusiast

Aturek

Posted
Posted

I am having the same issue. I did Lean how to manually take it out of 4wd. I replaced the transfer case motor, did the reset sequence and it has not helped my issues. but now rather than being stuck in 4wd and im 2 wheel and cannot get into 4wd.

 

When i took off the old transfer case motor, I heard a loud clunk when i pulled it off. Now the same 4wd light is lit but its actually only in 2wd

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