"Service 4WD" - Master Thread

[humer101]

Yeah, not sure why paddock chevrolet told me it expired. So i called a buddy at a different dealership and he told me the same thing! There's an open recall for the power steering, so he said he'd reprogram the transfer-case while its in there for me!

I know they will.

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[Tahoen]

Well, a week after i had it reprogrammed the Service 4wd came back on! wtf?

 

[humer101]

Well, a week after i had it reprogrammed the Service 4wd came back on! wtf?

That is a very bizarre situation.
The dealer makes any comments about.


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[TwoBigBoys n dog]

There are a few threads in different areas of the forum regarding the "Service 4WD" issue that many of us are dealing with on our 2015 Yukon/Tahoe/Suburban trucks. To date, there is no fix available and owners are just being advised to drive their vehicles in 2WD mode until told otherwise.

This is a clear safety issue and I am discussing it with a well-known automotive weblog that will help get the word out to current and potential owners of these vehicles.

So...if you have experienced the "Service 4WD" issue please chime in briefly as I am curious just how many of us there are here (and on the way) and it will help with documentation.

Thank you,
Scott

 

[TwoBigBoys n dog]

2018 Yukon Denali 6.2L 10 speed, now with 13,500 miles. Got the Service 4 WD light after shifting into 4 Low and driving in 18"+ snow. Drove well...did not chain up, but could / should have I routinely switch between 2 high, Auto n 4 high depending on snow n ice conditions and tow and down shift manual modes as I live on a hill. Dealer noted a short in the switch and replaced it a week ago. Will update if it re- occurs.

 

[kiwi]

2019 Tahoe Premier 6.2 8sp - 5200 miles, ONLY rwd (never ever switched to auto/4hi/4lo at all), got it at 5k miles. Today is my first service, will see what do they do.

 

[kiwi]

Got this message again, she decided to go into 4wd lo while i was driving (

 

[TwoBigBoys n dog]

That is not good, my friend. Hope you were wearing seatbelts and not running @ highway speed. I dont think 4 lo goes above 20mph.

 

[kiwi]

Brought her to the dealer. If they find smth, i'll be asking GM for TCM warranty change. Second time in couple of months in a car thats half a year old is not awesome.

 

[TwoBigBoys n dog]

I now have 24,500 ish on mine, but am running the 10 speed on the 6.2L. The transmission never 'autoshiffted' into 4 lo, and my light was determined to be a short in the switch. Has not happened (fingers crossed) again.