4WD noise

dplarson · October 26, 2019

My 6.0 gas sounds like a diesel when in 4WD. Not so bad coasting but accelerating or decelerating. Not crazy loud but enough that people in the back seat notice and describe it the same way.

2017 Sierra 2500 base w/ 4WD shift lever on the floor. Yes I know these trucks are somewhat louder than the higher trims but I haven't heard this before.

Honestly I haven't had it long and have barely used the 4WD. I'll check fluids I suppose.

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ickyoldman · October 26, 2019

I have heard this is normal. Just a function of the HD fwd

dplarson · October 28, 2019

Apparently normal and explained by #PIP5245B: Whine Noise Operating In 4wd - (Dec 11, 2017)
2015-2018 All 2500/3500
Supersedes PIP5245A

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GTBensley · October 28, 2019

I would still check transfer case fluid level as some have been low. But noise is normal

dplarson · October 28, 2019

Yes, I forgot to mention, it's still under warranty and that's exactly what I asked for. They put it up and checked transfer case and differential fluids. Then provided a printout of the info I posted above.

I went on my trip over the weekend on ice / black ice / fresh and packed snow, you know, Montana and while I heard it when engaged, the trip was thankfully uneventful and I wasn't worried about it the entire time.

I've only had it a few months and hadn't really used its 4wd. Prior to that I had a Suburban LTZ with AWD and could hear it engage and disengage but it didn't really make any other noise. I imagine it never really was staying engaged for any amount of time, just as needed per the AWD system.

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