Say Goodbye to the Flat Spotted Tires / Shuttering Theory

[tlivingd]

I'd be surprised any owner of a 2015-16 needs spacers on the center bearing support. On the used driveshaft I purchased, the support has sagged better than 5/16" (I don't know it's mileage). The only way to make this up is to lower the trans.

I'm surprised too as I was told the shims were added to the center bearing as the front half measured fine. My 2020 has 6700 miles and my problem started about 3000 miles. . I'm wondering if just the floor is that weak. I probably also put my seat further back than most as i'm 6'4" 255lbs with long legs. (I don't go all the way back)

 

[MJR]

I'm surprised too as I was told the shims were added to the center bearing as the front half measured fine. My 2020 has 6700 miles and my problem started about 3000 miles. . I'm wondering if just the floor is that weak. I probably also put my seat further back than most as i'm 6'4" 255lbs with long legs. (I don't go all the way back)

Mine was doing it from the day I got it. I wonder if there could be multiple things going on? Mine is only from 25-30ish mph.

I, too, am tall. 6'5". My seat is all the way back. Hmm...

 

[Z1000SX]

My 2019 G80 Sort 3.3 AWD has the 50-60 kmh (aka 30-35 mph) vibration. Typical symptoms as described in the other excellent posts on this thread. It started at about 18,000 km (approx. 11,000 miles). I waited until I put new winter tires mounted on new alloys to make sure that it was not wheel related. Still there, so off to the dealer two weeks ago. Initially the service rep. said that they could not detect it, so they sent the mechanic for a drive with me and he confirmed the problem. Once the car has been driven awhile it is admittedly pretty subtle so I was not surprised when it took a bit of effort to get them on side. They certainly were not trying to give me the runaround. They tried adjusting?? the flex coupling but no luck and advised me it was still there and that they would be contacting Hyundai engineering to come up with an explanation and solution. Yesterday they called me and said there is a TSB for the driveshaft issue and that they have ordered parts. I don't know at this point whether he was referring to the earlier TSB or a recent one. It is going to be interesting to see what parts are being replaced (and / or spacers added) and whether they have finally come up with a solution. I love the car and can honestly say it is my only serious issue. to date. I will follow up this post in due course with, I hope, good news.

 

[MJR]

My 2019 G80 Sort 3.3 AWD has the 50-60 kmh (aka 30-35 mph) vibration. Typical symptoms as described in the other excellent posts on this thread. It started at about 18,000 km (approx. 11,000 miles). I waited until I put new winter tires mounted on new alloys to make sure that it was not wheel related. Still there, so off to the dealer two weeks ago. Initially the service rep. said that they could not detect it, so they sent the mechanic for a drive with me and he confirmed the problem. Once the car has been driven awhile it is admittedly pretty subtle so I was not surprised when it took a bit of effort to get them on side. They certainly were not trying to give me the runaround. They tried adjusting?? the flex coupling but no luck and advised me it was still there and that they would be contacting Hyundai engineering to come up with an explanation and solution. Yesterday they called me and said there is a TSB for the driveshaft issue and that they have ordered parts. I don't know at this point whether he was referring to the earlier TSB or a recent one. It is going to be interesting to see what parts are being replaced (and / or spacers added) and whether they have finally come up with a solution. I love the car and can honestly say it is my only serious issue. to date. I will follow up this post in due course with, I hope, good news.

Great that it's on order. Fingers crossed that this is the answer. Yes, please keep us updated.

And welcome, by the way!

 

[Kraig Wilkinson]

My 2019 G80 Sort 3.3 AWD has the 50-60 kmh (aka 30-35 mph) vibration. Typical symptoms as described in the other excellent posts on this thread. It started at about 18,000 km (approx. 11,000 miles). I waited until I put new winter tires mounted on new alloys to make sure that it was not wheel related. Still there, so off to the dealer two weeks ago. Initially the service rep. said that they could not detect it, so they sent the mechanic for a drive with me and he confirmed the problem. Once the car has been driven awhile it is admittedly pretty subtle so I was not surprised when it took a bit of effort to get them on side. They certainly were not trying to give me the runaround. They tried adjusting?? the flex coupling but no luck and advised me it was still there and that they would be contacting Hyundai engineering to come up with an explanation and solution. Yesterday they called me and said there is a TSB for the driveshaft issue and that they have ordered parts. I don't know at this point whether he was referring to the earlier TSB or a recent one. It is going to be interesting to see what parts are being replaced (and / or spacers added) and whether they have finally come up with a solution. I love the car and can honestly say it is my only serious issue. to date. I will follow up this post in due course with, I hope, good news.

Good luck to you my fellow Genesis owner. I hope they can make it right for you. I suppose I should be grateful that my 15 5.0 RWD does not have this issue. I rarely drive at those speeds. When I do drive at those speeds I have been looking for any sign of a flutter or vibration and can say my Genny is smooth as at is at any other speed. I hope you get it fixed.

 

[tlivingd]

I put enough miles on to say that the 30-35 mph vibration is gone after they performed the TSB posted a page back. Hopefully it stays gone.

 

[ntmehan]

How Many miles does your car have?

64000 miles on mine. I bought it with almost 48000 in June last year and didn't notice the flutter until it started to cool down in the fall. That means I probably started bringing it in to the dealer for the flutter at 52000-55000 miles. It's been in 3-5 times and the last time, I drove it cold with the Genesis tech and he heard it and told me he wouldn't be able to fix it unless Hyundai was willing to just start throwing parts at it...

Kraig I think it's you and I that have the same exact spec ('15 Empire State Grey 5.0 Ultimate with black interior) if bet they rolled off the line real close to each other. My build date was July 26, 2014, and in-service October 19, 2014.

 

[Kraig Wilkinson]

64000 miles on mine. I bought it with almost 48000 in June last year and didn't notice the flutter until it started to cool down in the fall. That means I probably started bringing it in to the dealer for the flutter at 52000-55000 miles. It's been in 3-5 times and the last time, I drove it cold with the Genesis tech and he heard it and told me he wouldn't be able to fix it unless Hyundai was willing to just start throwing parts at it...

Kraig I think it's you and I that have the same exact spec ('15 Empire State Grey 5.0 Ultimate with black interior) if bet they rolled off the line real close to each other. My build date was July 26, 2014, and in-service October 19, 2014.

I will have to check my build date. My 15 5.0 went into service April 22, 2016. I still have the factory 5 year 60k remaining. I purchased CPO.

 

[tlivingd]

My shake came back a short while performing the TSB. Maybe 100 miles.

 

[Z1000SX]

My shake came back a short while performing the TSB. Maybe 100 miles.

Damn.

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[arcman]

I'm not surprised one bit. If the driveshaft angle thing is critical (and has anything to do with the vibration), they'd do just the opposite and shim the trans down to put the relationship back to where it was stock, b/4 the center bearing support sagged.

As I mentioned in a previous post... Here's the center bearing of the used shaft I bought. It's upside down in this pic but it's obvious, even with the weight of the shaft on it, the bearing rubber has sagged a bunch. I measured over 5/16"difference. Putting washers above the support creates more of an angle. Unless I'm missing something here... that dealer hasn't a clue.



Though I focused on the guibo being the culprit, I also considered the center bearing. If this is so soft to allow this sag, it just may allow an out of balance shaft to wiggle inside this support. This would be so easy for Hyundai engineers to check. A high speed video camera pointed at the support would confirm any suspicions. Though you can't get this support from Hyundai, if I remember, I did find an aftermarket substitute through PowerTrain.

This morning I called Hyundai USA and even after begging, they would give me no info on the TSB... call the dealer. Been there.

 

[dboz1031]

I am all for trying to replace this with something more durable. I am going in for the TSB but appears it’s a waste of time. Has anyone tried a driveline shop to see if that is replaceable with something more stout or less deflective ?

 

[armourben]

Got the car back after having the TSB completed and as of right now the sound/vibration is gone. Not holding my breath, will report back if it returns.

 

[dboz1031]

Last time I was in they RESET my transmission, it improved. Less frequent and less intense. Went to and from work yesterday with no shakes. The changing character is what drives me nuts about it. Mine goes in for the TSB soon. Not optimistic about it but good to hear! Thanks for the update!

Makes me think it's still the converter.

 

[Z1000SX]

Mine in for the TSB yesterday. Adjusted the angle as per TSB and according to the tech, no improvement and in fact a little worse. Took the spacers out and now back to pretty much the way it was. As per the TSB, they have ordered parts to replace the driveline. On back order and likely not here until sometime in January.

 

[dboz1031]

My TSB was a failure also. Its the converter. Only way to explain my car IMO.

 

[arcman]

I highly doubt it's the converter. I noted in my first post that as soon as the rear driveshaft was disconnected, the vibration was gone. Hyundai knows it's the driveshaft or they wouldn't have issued the (so far ineffective) TSB.

 

[dboz1031]

I believe what you are saying but how can I have no vibration, stop to get gas, leave and then have vibration?

 

[arcman]

I will have to admit... I only ran the car once after disconnecting the shaft. Was so amazed at the difference, I didn't shut if off and try again.

Sometime in the near future I will start on this again. Possibly buy a new shaft or center bearing for the used one I have. If I can find someone to balance the shaft, I will do that first.

You are right about how it behaves. I get the same results... drive the car on the interstate, shakes like hell. Get off, stop at store, get back on... vibration gone. I never did shake like this until the last 5k miles and it's getting bad. I'm pushing 50k.

I'm leaving in a bit for the first time this morning. I will try different gears at 29 mph to see if the noise is still there. I will also stop, shut it off and start again when it's cold. Can't remember if I tried that or not. That could rule out the trans.

 

[RyanB]

I just made a trip from Chicago to Memphis and my car went from a slight vibration to hold onto your seats were all going to die! Even the kids in the back asked why the car would start vibrating so bad. I also noticed when it only had a slight vibration and I went into a medium to hard curve on the highway the vibration would at times increase when I came out of the turn. And other times it would decrease after a turn. To me this means the driveshaft is slightly moving at times which could be why when you pull into a gas station or stop at a store it comes and goes. My car did smooth out at over 105 but even with Covid I don't think I can get away with driving 105 to work every day.....