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Discussion Starter · #1 ·
This might be a stupid question, but how the h%*# do I tell if the shift motor and transfer case are both in the neutral position? I think my shift motor needs replacing, since I'm stuck in 2WD and can't get it to shift into neutral, but I wanted to try manually turning to neutral first. Problem is, I can't for the life of me find any indication on either the motor or the transfer case of where the neutral position is. Here are a couple pics, for reference:

Automotive tire Rim Automotive wheel system Auto part Circle
Automotive tire Gear Bicycle part Finger Bicycle chain


Any help would be greatly appreciated! Thanks!
-Ben
 

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2017 Chevy Colorado Z71 Extended Cab 4WD Summit White
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6,058 Posts
Shifting Into N (Neutral)
To shift:
1. Park the vehicle on a level
surface.
2. Set the parking brake and press
and hold the brake pedal. See
Parking Brake on page 9-41.
3. Start the vehicle or turn the
ignition to ON/RUN.
4. Shift the transmission to
N (Neutral).
5. Shift the transfer case to 2
Triangle Sleeve Rectangle Symbol Font

.
6. Turn the transfer case knob
clockwise to N (Neutral) until it
stops and hold it there until the
N (Neutral) light starts blinking.
This will take at least
10 seconds. Then slowly release
the dial to the 4
Triangle Symbol Font Electric blue Parallel
position. The
N (Neutral) light will come on
when the transfer case shift to
N (Neutral) is complete.

Page 9-39 in the 2015 GMC Canyon Owners Manual

https://www.gmc.com/bypass/pcf/gma-.../2000/MA2827/en_US/6.0/2k15canyon3rdPrint.pdf
 

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11 Posts
Discussion Starter · #3 ·
Shifting Into N (Neutral)
To shift:
1. Park the vehicle on a level
surface.
2. Set the parking brake and press
and hold the brake pedal. See
Parking Brake on page 9-41.
3. Start the vehicle or turn the
ignition to ON/RUN.
4. Shift the transmission to
N (Neutral).
5. Shift the transfer case to 2 View attachment 440637
.
6. Turn the transfer case knob
clockwise to N (Neutral) until it
stops and hold it there until the
N (Neutral) light starts blinking.
This will take at least
10 seconds. Then slowly release
the dial to the 4 View attachment 440638 position. The
N (Neutral) light will come on
when the transfer case shift to
N (Neutral) is complete.

Page 9-39 in the 2015 GMC Canyon Owners Manual

https://www.gmc.com/bypass/pcf/gma-.../2000/MA2827/en_US/6.0/2k15canyon3rdPrint.pdf

Thanks for the quick reply! Unfortunately, I already tried this and it didn't work. I also tried running the relearn procedure from SPS and that didn't work either. I wanted to try manually turning the gear to the N position, I just can't find any indicator of the N position on either the motor or the gear in the transfer case.
 

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2017 Chevy Colorado Z71 Extended Cab 4WD Summit White
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Thanks for the quick reply! Unfortunately, I already tried this and it didn't work. I also tried running the relearn procedure from SPS and that didn't work either. I wanted to try manually turning the gear to the N position, I just can't find any indicator of the N position on either the motor or the gear in the transfer case.
You did with the parking brake on?
 

· Super Moderator
2017 Chevy Colorado Z71 Extended Cab 4WD Summit White
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6,058 Posts
Have you ever changed the fluid in the transfer case?
Does it go into 4HI and/or 4LO?
 

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Discussion Starter · #8 ·
Have you ever changed the fluid in the transfer case?
Does it go into 4HI and/or 4LO?
No, I haven't ever changed the fluid. And no it won't go into 4H or 4L - stuck in 2H and giving me "Service 4x4" error. I tried reprogramming the TCCM and running a relearn from SPS, but I'm still getting code "C038D: Range Actuator Position Not Learned".
 

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2017 Chevy Colorado Z71 Extended Cab 4WD Summit White
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6,058 Posts
No, I haven't ever changed the fluid. And no it won't go into 4H or 4L - stuck in 2H and giving me "Service 4x4" error. I tried reprogramming the TCCM and running a relearn from SPS, but I'm still getting code "C038D: Range Actuator Position Not Learned".
Well if you don't have enough fluid in the transfer case it will not be able to change.
One of your posts mentioned you had a 2015 Canyon. That fluid is 7 to 8 years old.
Could be a big part of the issue
 

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Well if you don't have enough fluid in the transfer case it will not be able to change.
One of your posts mentioned you had a 2015 Canyon. That fluid is 7 to 8 years old.
Could be a big part of the issue
The other possibility in my mind, could be a bad transfer case actuator motor and I don't know how many there are on these trucks.

My Jeep Commander has 2 actuator motors on the transfer case, an upper & a lower and I had to replace the lower transfer case actuator motor, due to not being able to shift into 4-LOW (was getting the Service 4WD System MIL).

And 7-8 year old transfer case fluid, is definitely not a good thing.
 
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