zert100

Yeah, I agree. I don't think my issue is mechanical at all and apparently neither does the engineer. The service advisor gave me and update yesterday afternoon. He said the engineer wants to replace all the electrical components and sensors and have the originals sent in for testing. The parts are on order and should be in next week. The idea behind this digital assist steering is cool, but I'm not sure that the complexity is worth it. To many possible points of failure...

So my 2016 had the service power steering msg show up twice one day last week. brought it to the dealer today and they said they had to contact an Engineer to find out what should be done. I have a copy of PIE0430. My truck doesn't appear to be leaking from the steering gear and I do not notice excessive lash. When the msg comes on the steering feels like its over assisted (easy to steer). When I restart the truck and there's no msg the steering feels fine again. Anyone had these symptoms with theirs?

doesn't work with the 6 speeds either...

I have a very pronounced decel clunk most noticeable in 2nd and 3rd gear. GM says its normal for your new truck to clunk like it has a bad U-joint. I believe its related to the TCM program. I think that it could be tuned out but could adversely affect fuel mileage. Because of this we will most likely not see an update from GM no matter how much we complain! I seems that plenty of the 8 speeds have this same characteristic. Sad, very sad!

Does yours only clunk on deceleration as well? I sent you a PM also

mrbadwrench, You appear to be very knowledgeable and make some good points. My biggest issue with this characteristic is that it appears that only certain vehicles exhibit this clunk. It seems to be a quality control issue that GM should be able to get their hands around. Like I stated in the original post, I do understand that a certain amount of driveline "slop" is to be expected and frankly is needed for everything to mesh together. But for GM to say that any amount of clunking is normal does not seem like an appropriate way to deal with all of these cases. I feel that a lot of the slop in my truck stems from the trans. I find it odd that I have absolutely no clunk in 1st gear. Do you have any idea why that may be? Also, what is a U bolt dampener. I didn't find anything with a quick google search. Thanks.

So I've been dealing with this clunk on my '14 6.2 Sierra crew s/b. It is most noticeable when letting of the gas in second gear, but is also noticeable in higher gears to a lesser degree. It will clunk every time I let off the gas in second gear. The driveline will absolutely not clunk in first gear. The first time I took it in to the dealer the service manager rode with me and agreed that the clunk didn't seem normal and suspected the rear axle or driveshaft was the culprit. I was pleased that he appeared willing to dig into the problem and was hopeful for a resolution. Later that day I returned to pick up the truck and was told that they performed the TSB relating to torqueing the shackles and U bolts. I didn't expect that to fix the problem and it certainly didn't. I brought the truck back shortly after and they checked for any TCM updates to no avail and opened a case number with GM. After that they handed me the TSB stating that clunking is normal. Yesterday I went in for an oil change and told them I'm still not satisfied with the low speed clunky driveline of this truck and asked to drive one of their loaners to compare the low speed driving characteristics. The truck I drove had no noticeable clunking at all. This test drive only reinforced my belief that something in not right with mine. Of the 5 late model full size GM 4x4 vehicles I've owned none of them clunked like this 2014. An occasional clunk is to be expected especially in a 4WD and I could live with that, but this thing clunks all the time! This does not seem appropriate for what is otherwise a very nice driving and expensive vehicle. I am totally frustrated with how my dealer and or GM is handling this case. Has anyone had any luck getting this type of issue fixed? Any insight is appreciated.

Yes, I checked them last week. They were nice and tight. I think the dealer checked them as well. Thanks.

Looking forward to your results. I hope its different than mine which has been to turn the radio up louder!! Seriously though, the more I drive this thing the more I think this clunking is mostly related to the way this transmission works. How many of you are having the same clunking that I and sugarjohnson have? It is most noticeable in 2nd and 3rd gear when letting of the gas. I don't get much clunking when getting back on the throttle in those gears, mostly just when letting off.

I did speak with someone at a local driveline shop. Unfortunately he didn't have any silver bullet ideas as to what could be causing the noise. He did say that the slip yoke problem is mostly a thing of the past because GM went to a Borg Warner transfer case in '08 and they haven't seen issues with the yoke on the new trucks. He did say that I could check with a shop down the street that has a "chassis ear" to try and isolate the noise. I am at a loss as to what the culprit is. It is hard to believe in the age of social media that someone hasn't figured out how to fix this seemingly common issue. there has to be thousands of trucks out there with this problem. The only thing the dealer did was re torque the shackles per a TSB and show me the other TSB that states clunking is a normal characteristic. I could, and have, lived with a little clunking now and then in my past trucks, but this thing clunks loudly and consistently ALL of the time!!!

I have the "clunk" mostly noticeable when I let off the gas when the truck is in 2nd gear. So driving in parking lots and driving through neighborhoods its very noticeable. The dealer and GM say its normal. I've had 5 different late model GM 4x4's and none of them clunked this bad. pretty sad! I tried clamping the springs and it made no difference on my truck. I'm still trying to figure out what is causing it. I may try a local driveline shop to get their opinion. I will keep this updated if I find out any useful info.

I gave them a copy of the PI and they ordered the parts. It was pretty painless. They also ordered the headlight bulbs for that update as well

Had the update done yesterday and the seat feels very solid now. The tech that did the work said the new laterial supports should work well.