Barak
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Everything posted by Barak
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Yep 1500s arw more prone to the issue. I hve a 2500HD and sort of experienced it but since have not felt it. So I am thinking it may have something to do with drive shaft being aluminum and when it’s hot weather it absorbs more heat plus from driving it heats up faster so the turnes make it vibrate/shake. I am waiting till spring/summer to troubleshoot and go from there. Hopefully it was just something to do with new truck not broken in yet. That’s as far as I got with it but others on this forum have engaged other means including taking it to legal process. Will have to see if GM comes out with recal or fix.
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Is your truck 1500 or 2500HD model?
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I feel like GM will finally have a recall. Interesting to see what will unfold.
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https://mandrillapp.com/track/click/30000523/www.classlawdc.com?p=eyJzIjoiWkp4LVZwUFZoYlgtaS1HWkctczZYZGgyc2xvIiwidiI6MSwicCI6IntcInVcIjozMDAwMDUyMyxcInZcIjoxLFwidXJsXCI6XCJodHRwOlxcXC9cXFwvd3d3LmNsYXNzbGF3ZGMuY29tXFxcLzIwMThcXFwvMDJcXFwvMDFcXFwvY2hldnktc2hha2UtY2xhc3MtYWN0aW9uLWludmVzdGlnYXRpb25cXFwvXCIsXCJpZFwiOlwiYTUzMjVkNjIzZTE5NDg1ZGIzYWEzOTQ4NmJhZDZjYzVcIixcInVybF9pZHNcIjpbXCIzOTUxZDQ0NGRiNjk5YTdhYjg1ZTcxN2E5YzcyMmIwMDFiNWNiZmNiXCJdfSJ9
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LoL totally agree on a fix part. Michelins are great tires. I once had this same vibe/shake experience with my Tundra truck, which would be 1/2 ton same class as 1500 Sierra or Silverado and it turned out to be tires causing it, actually bridgestone ones. Well Toyota told dealer to ask me what brand I wanted. So I told them michellins. But you can see how quick GM is when they need to sell a vehicle to meet their monthly goals vs when they need to extend that superior customer service when they need to service the vehicle or do any type of customer service. I think this is true with any vehicle manufacturer.
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Unreal. I hope the tires are not Goodyear wranglers because lot people have complained about those. My first inclination was tires, then rims, now a driveshaft. However, I no longer experience the vibration/shake at all so I am wondering if it was just needing to drive for 2,000+ miles to break-in. Or the weather aspect has an effect on driveshaft so vibration will return in warmer weather. I do have an open case and they are still to run PICO on shaft l, but I will ask to hold off until next summer or have them do it now than again in summer to rule out shaft if in fact. More to come...
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Wow GMCJoe17. That’s insane! So they fix it with one component but cause the same issue with another. Are these techs certified with experience or just random techs who have no clue how to work a balancer let alone fixing anything else of such capacity. Crazy for sure!
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Appreciate the update GMCJoe17. It’s interesting how GM knows it’s driveshaft issues and they just wouldn’t go ahead with a recall. Instead they try to circumvent the obvious and make it sounds like it’s all others parts like tires, axels etc. My dealership finally admitted that there was one other customer of theirs who had similar concern as we all do and they had to replace all of his axels. So like others commented, it may be a combination of components and/or one component depending on a truck model trim etc. But I still do believe it’s a driveshaft for many of us out here. Interesting enough I no longer feel the vibration at any speed whatsoever, however, I am in agreement with someone who said something about aluminum shaft and heat absorbing fact in warm weather vs cold. I reside in CNY and currently our weather conditions are in upper 30s to low 40s and have to say it has something to do with driveshaft but at this point whatever it may be it’s helping and I am happy. Will have to see what driving dynamics summer 2019 brings, probably vibration LoL!
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Based on all of information thus far, my best guess will still be that a specific cabin/seat and rear of cabin shake/vibration is due to aluminum driveshaft. I currently have an open case with GM and will be working with dealership in terms of performing PICO test but I will recommend to them to perform PICO in hot weather conditions vs cold. Being that I reside in CNY and it’s in 40s currently, I will ask to wait till June/July 2019 and have PICO done when weather is up in 70s+. My take is just like someone else mentioned in this forum that aluminum absorbs heat fast and could expand so due to all that it may cause vibration as driveshaft turns, etc especially at higer speeds. As of now I had my tires road forced, wheels checked, brakes/rotors inspected and nothing has been found out of ordinary however at the same time I am no longer experiencing any vibration similar to what I did while weather was warmer so we will see. It seems that GM is well aware of this issue but doesn’t want to proceed yet however I do feel it should be a recall anytime soon.
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Interesting perspective. I hope GM is reviewing and listening to these experiences we are all having. The driveshaft hot/cold makes lot of sense given weather conditions in certain parts of country unless it’s tires or any other suspension components which seem to be first things GM suggests to look into and rule stuff out.
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Rolling tunder - the dealership told me they got no prints from road forced balancing because the machine can’t print results to a printer. So not sure how that works because an independent tire shop told me to ask dealership for printout of results as they said they had issues with Goodyear wranglers the very same one on GM trucks. Like tires were bad from manufacturer to start with. Who knows anymore what’s the cause but like others said GM knows but won’t admit to it.
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Excellent summary thank you totally agree with rolling thunder. I am expecting them to say PICO is within specs just like they did road forced balancing and said within GM specs. After I asked them to provide in writing, they said machine doesn’t print such information. Is it really true? I don’t believe anything they’re saying, always need to validate.
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Great so something is in works. I feel that’s a normal way of doing, first the bulletins than recall etc. Speaking of bulletins, I think these are the two: 16-NA-339 and PIT5451B. I told my dealership to have my truck gone through both of these to check but my understanding is that these bulletins have nothing to do with Sierra 2500HDs or Denali HDs. They are more specific to 1500s and other GMC models excluding heavy duty pickups. I am also starting to feel maybe some of it could just be me or the fact I am now driving diesel beast compared to gas engine. Have to hang tight and see but I don’t want anything wrong with my truck after so much time of waiting to get into one!
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LoL what a process. Well interesting enough I have to say that I have not been noticing vibration at 72-75 speeds anymore. It’s strange but it’s no longer apparent like before. I did sort of feel it at higher speeds like 85-95 but that could be due to cross winds etc especially going that speed. However, the dealer should be reaching out back to me to work on service bulletins once they have PICO tool in thier hands. So we will see what that comes to. I do feel that a real shake/vibration is at driveshaft area. And it’s not uncommon for engineers to come out and enage. Hopefully by having engineers due this maybe GM will come out with a fix and recall. Let see what happens. Keep posting please. Thanks!
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I am on par with rest of guys saying it’s driveshaft and I can actually relate my concern a lot to driveshaft so I will be exploring the idea of ensuring driveshaft is what needs to be cured. Just not sure GM will opt for replacing it with steel one otherwise if aluminum it won’t fix it. I do believe GM knows of this to be driveshaft but wouldn’t admit due to so many needing to be fixed at thier expense. More to come. Thanks!
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I see. What an idiots. Why replace with another aluminum if it’s a cause knowing steel one would cure the issue. Well I guess my next step is PICO and hopefully that’s a test of driveshaft. I wonder what it would cost for my diesel denali HD. Thanks!
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Thanks Bart. I actually speculated driveshaft at first but after reading many posts it lead me to other things like tires and such. However, I am leaning more towards driveshaft. Would this be something dealer can determine via PICO test or how did you figure it out? Where did you get a steel one? I am assuming this could be under warranty part so dealer can replace if that’s what is needed. Thanks!
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Lol good one! Well from begging I have been saying how I wasn’t impressed with these technicians to start with. So I will let them do the PICO test amd after that I will go to independent tire shop to have them do road force balancing which I will pay for $100 but ok just to see. So more to come!
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Update: went to dealership per GM to troubleshoot for service bulletins I found which may be related to my vibration concerns. Dealership took vehicle in but told me because it would go thru a PICO test, they weren’t sure if one was available in their shop. I left and 7 hours later advisor contacts me telling me they don’t have PICO tool and one was on order so they will have to call me to bring truck back. I said ok sure. Went to pick it up and truck was parked on lot same exact way I left it meaning they didn’t touch it. Anyway, so next step is PICO test. However, this time I was approached by service manager who informed me that they had a customer with similar concerns and they ended up replacing shafts, drive axles, etc. So this time I learned that dealership is aware of the vibration concerns and so is GM and it’s now occurring on 2500HDs not just 1500s sierras or Silverados. There you go guys that’s what I learned about this time and what’s next step for me. Thanks!
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Ok thanks. So you are getting it here and there. That’s what I am starting to experience now too. No more shake/vibration at 72-75 speeds but felt it little at 77, 81 and 85. Very strange but interesting. I haven’t gone to independent tire shop yet as they instructed me to continue exploring with dealership first due to cost they would need to charge me for road force balancing which would be about $100 for 4 tires. I will be at dealership tomorrow for another look per 2 service bulletins to rule some stuff out. Will provide update. Thanks!
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That’s very interesting discovery. Well here is how far I got. So far 2x to dealership first time was road forced balancing second was let some air pressure out of rear tires. At that point I was at 800 miles or so. Now I am at 1300 miles and come to find out shake/vibration is reduced significantly for whatever reason. However in mean time I did reach out to GM corporate and they have now an open case only because I wanted the dealership troubleshoot for 2 service bulletins relative to bent wheel, bad tires and driveshaft turnes. So will be back in for 3rd visit to see what they will come up. I have speculated whether or not it could be something with bent rotor or not properly functioning caliper(s). I have felt brakes to squal as well so now I am just curious. And shake/vibration reduction may have been to rotors wearing off or caliper dead or who knows anymore. More to come.
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I am going to consider going to independent shop just to rulle rims/tires out and maybe I will learn something new about these Goodyear wranglers from them! After that I will continue with the dealership if vibration persists as I have learned some had ring and pinion replaced per GM.
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Thanks Don67. What brand tires do you have? The dealership has told me that every time they balance any truck tires, they do it on road force balancer and within manufacturers specs in my case GMCs. However, my dilemma is that when I go there it’s usually some young tech who I feel doesn’t even listen to what my frustration is. They also hesitate to drive the truck on thruway at speeps such as 73-75mph. So far I drove the truck on thruway at many speeds including at 80, 90 and 95. I am shocked to say that only shake/vibration that I am curious about still occurs at speeds 73-75. It’s very interesting! So at this point I feel taking it to independent tire shop and explaining to them the shake/vibration at that speed to see if they will be able to road force, rotate as well and see what they say about the GMCs specs requirements. I just don’t know if the dealership would continue cooperating if I end up going to independent tire place. Thoughts?
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Right. Based on all reads and everything I learned about so far, I am still studying it. Reason is while I know this vibration affects 1500s, I am not sure if what I feel is aort of normal for 3/4 ton heavy duty truck and diesel. So I am just curious now about it all and need to explore further.
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6 speed...
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