Auto 4WD Issue locking front right tire

[phatz_hatz]

Around 40-50 MPH with Auto 4WD selected, feels like front passenger side tire is either locking up or “ sputtering “ When i put into 2H it seems to alleviate issue a lil bit but still happens intermittently. Is this an issue with auto braking assist or something to do with the 4WD module. Almost feels like hitting rumble strips on a highway. Have 100k warranty 2016 LTZ Tahoe with 80K, just want insight if anyone’s ran into this issue before. Newer vehicle to me, not used to all this electronically controlled shit. Thank you in advance.

 

[swathdiver]

Around 40-50 MPH with Auto 4WD selected, feels like front passenger side tire is either locking up or “ sputtering “ When i put into 2H it seems to alleviate issue a lil bit but still happens intermittently. Is this an issue with auto braking assist or something to do with the 4WD module. Almost feels like hitting rumble strips on a highway. Have 100k warranty 2016 LTZ Tahoe with 80K, just want insight if anyone’s ran into this issue before. Newer vehicle to me, not used to all this electronically controlled shit. Thank you in advance.

Does it do it also in 4HI? If not, this seems more like a transfer case issue. If so, it's likely a front differential issue and should be taken in, drive in 2HI until it's fixed.

Do you drive in 4AUTO all the time?

 

[Fless]

Have the wheel speed sensors been graphed and compared to see if that one is off a bit?

Brake caliper "floating" okay? Slide pins lubed and free?

 

[phatz_hatz]

Does it do it also in 4HI? If not, this seems more like a transfer case issue. If so, it's likely a front differential issue and should be taken in, drive in 2HI until it's fixed.

Do you drive in 4AUTO all the time?

Just got the truck 2 weeks ago, when i test drove it, it was in auto 4. When we picked it up they put it in 2H. So curiosity yesterday put it in auto 4 and it started happening. Put it back in 2 Hi haven’t tested it in 4HI.

 

[swathdiver]

Just got the truck 2 weeks ago, when i test drove it, it was in auto 4. When we picked it up they put it in 2H. So curiosity yesterday put it in auto 4 and it started happening. Put it back in 2 Hi haven’t tested it in 4HI.

Ok, test it out in those positions and let us know.

Running around in 4Auto wears out the components prematurely. It was not made for daily use over the life of the vehicle. Folks who drive in 4Auto all the time are lucky to get 100K miles on their transfer case before requiring overhaul.

 

[phatz_hatz]

Ok, test it out in those positions and let us know.

Running around in 4Auto wears out the components prematurely. It was not made for daily use over the life of the vehicle. Folks who drive in 4Auto all the time are lucky to get 100K miles on their transfer case before requiring overhaul.

update, issue still occurs even when in 2H. have not tested 4HI. As i believe it is not a 4WD issue as i initially suspected, i'm leaning towards may have to do something with the brake assist or vaccum pump associated with the braking system. very intermittent issue. I am afraid if i bring to the dealer and they drive it, it will not do it and i will be stuck with the issue. i know the pump was replaced at about 60k miles. just very odd to me why it would be doing that without the brake pedal even being applied. If this post has to moved to a different section considering it is not pretaining to the engine and drivetrain. Thank you in advance for any insight !

 

[Fless]

Seems to be isolated to one wheel, so I'm not sure I'd suspect the vacuum pump yet. Get a good scanner on it and watch the wheel speed sensors to see if they are all reporting the same (with particular scrutiny on that RF one). Check that caliper for proper operation and abnormal pad wear, maybe a rubber brake hose collapsing or the like.

 

[phatz_hatz]

Seems to be isolated to one wheel, so I'm not sure I'd suspect the vacuum pump yet. Get a good scanner on it and watch the wheel speed sensors to see if they are all reporting the same (with particular scrutiny on that RF one). Check that caliper for proper operation and abnormal pad wear, maybe a rubber brake hose collapsing or the like.

Its honestly both sides at this point, sometimes both at the same time. im gonna call dealer i have a 100k warranty on it and i just got the truck a little over 3 weeks ago so they cant try and say i missed a maintenance schedule. Regardless there is an issue, id attempt to tackle it myself but all this technology is a little out of my league. Got the warranty for a reason might as well use it while i have it. thank you for your advice, i am looking into getting and MDI scanner at some point in the future.

 

[Fless]

After it's fixed, please share what they did to it. Inquiring minds want to know...