Service Stabilitrak - odd experience

SkiDooNick700 · December 18, 2020

Heys guys. 2015 6.2L Sierra Max Tow.

Picked my truck up from Ziebart yesterday, DIC displayed the Service Stabilitrak message, I ignored it as it has popped up several times over the life of vehicle but never noticed anything wrong.

This time, I did notice something. As I pulled out of the parking spot, it felt like 4wd was engaged. Felt like drivetrain was binding and tires skipping/hopping from locking up. Whether it was a good or bad decision I kept driving a few miles down the road to a store. When I pulled into a parking spot, I experienced the same binding.

I noticed on the 2wd/4wd nob that the light was very dim. Turned truck off, turned truck back on, no message, but 2wd/4wd nob light very dim. Put it to Auto, light comes to regular brightness. Flip back to 2wd, not sure if the truck rolled slightly or what but I felt like the rear of truck dropped down. 2wd/4wd nob light still full brightness. Drove to a few more stores on way home, no issues.

It was snowing so I was purposely getting TC / ST to come on when in parking lots and also on my street to my house. It was working normally.

I'm almost thinking the truck was confused and didn't know what drive mode it was in? Maybe it was in 4wd even tho nob was in 2wd? Sure felt like it!

Any thoughts?

JimCost2014 · December 19, 2020

15 hours ago, SkiDooNick700 said:

Heys guys. 2015 6.2L Sierra Max Tow.

Picked my truck up from Ziebart yesterday, DIC displayed the Service Stabilitrak message, I ignored it as it has popped up several times over the life of vehicle but never noticed anything wrong.

This time, I did notice something. As I pulled out of the parking spot, it felt like 4wd was engaged. Felt like drivetrain was binding and tires skipping/hopping from locking up. Whether it was a good or bad decision I kept driving a few miles down the road to a store. When I pulled into a parking spot, I experienced the same binding.

I noticed on the 2wd/4wd nob that the light was very dim. Turned truck off, turned truck back on, no message, but 2wd/4wd nob light very dim. Put it to Auto, light comes to regular brightness. Flip back to 2wd, not sure if the truck rolled slightly or what but I felt like the rear of truck dropped down. 2wd/4wd nob light still full brightness. Drove to a few more stores on way home, no issues.

It was snowing so I was purposely getting TC / ST to come on when in parking lots and also on my street to my house. It was working normally.

I'm almost thinking the truck was confused and didn't know what drive mode it was in? Maybe it was in 4wd even tho nob was in 2wd? Sure felt like it!

Any thoughts?

Check the screen on the dash for 4WD functions, see if it switching and giving you messages on each step.

https://youtu.be/WgTeYZW1KD4

SkiDooNick700 · December 19, 2020

10 hours ago, JimCost2014 said:

Check the screen on the dash for 4WD functions, see if it switching and giving you messages on each step.

https://youtu.be/WgTeYZW1KD4

I should have went to this screen right away to see what it was displaying but didn't think to do that until I switched from 2wd to Auto, and then back to 2wd. It was displaying the messages it typically does.

M1ck3y · December 19, 2020

Is it working fine now? Maybe the knob got bumped while the truck was turned off :dunno:

SkiDooNick700 · December 20, 2020

10 hours ago, M1ck3y said:

Is it working fine now? Maybe the knob got bumped while the truck was turned off

Yea everything is fine now. Who knows what happened...

Whocares619 · December 20, 2020

I'm in a 14 z71 and was doing exactly that. On freeway couple days ago sudden extreme shake and bam front axle bearings exploded through the boot. I replaced axle but front passenger side wheel seems to have solinoid locked . wont spin when on jack. I have service 4 wheel message but no codes showing on basic reader. My battery was tired already so i replaced it just to rule out low voltage causing it. And I read somewhere not to shut off truck in auto . I tried to remove battery and hook cables together to reset the truck but service message immediately reappeared before I even started the truck. Somebody has to know. I'm efficient at electrical and am covid broke . how can I wake up the encoder motor or find out if it's bad?