Say Goodbye to the Flat Spotted Tires / Shuttering Theory

[ChinDynasty]

I'm pretty clueless on the driveshaft and flex-mount technology, but why use rubber to handle the flexing? Why not use some sort of metal configuration using ball bearings, or ball joints, or similar?

My driveway is pretty steep and I've always reverse parked it overnight. Last night, I had the G80 parked out on the flat sidewalk street overnight. I took it for drive today and lone behold. I didn't hear any flutter with air and music off. I am going to park front side up and put brake on to see if taking the pressure off will do the same.

 

[ChinDynasty]

My driveway is pretty steep and I've always reverse parked it overnight. Last night, I had the G80 parked out on the flat sidewalk street overnight. I took it for drive today and lone behold. I didn't hear any flutter with air and music off. I am going to park front side up and put brake on to see if taking the pressure off will do the same.

Changed rims and tires, parked on non slope. None matters still the flutter noise for me. Noise varies based on weather temp of the day.

 

[asleep@thewheel]

Sorry for jumping in late, just came across this thread.

Just as a data point, I was an airline pilot and my car (2015 5.0 Ultimate) sat at the airport for several days every week when I was on a trip. When I got started on my drive home I was on an exceptionally flat smooth road. It always (and cold weather was worse) felt like flat spotted tires for the first several miles, then went away.

However, I retired last year and now drive the car everyday. Now I never get that flat spotted tire feeling/vibration.

I wonder if the tires were actually flat spotted from sitting 3/4 days, or if daily driving helps keep this rubber connector more flexible. Does it take a "set" the longer it sits? Anyway, I feel lucky now, it's totally gone.

Great thread...love reading about stuff guys know how to fix.

 

[armourben]

Thanks for all the research and info!

Same issue everyone is reporting, looks to be a pretty widespread issue - a few people on some of the genesis Facebook groups are describing the same thing.

Brought the car to the dealer just before COVID and they could not reproduce the issue. Anyone make any progress on this?

Thanks!

 

[TinsleyC]

I wonder if the tires were actually flat spotted from sitting 3/4 days, or if daily driving helps keep this rubber connector more flexible. Does it take a "set" the longer it sits? Anyway, I feel lucky now, it's totally gone.

Most who have the condition do say that it's definitely affected by time and temperature. I can't honestly say I've ever experienced it, but I seldom go more than two days not driving my car. If the tires did go "thunk", I would probably blame it in the road...

 

[tlivingd]

Just going to jump in here. 2020 G80 Sport 3.3T awd and 3600 miles. I have 'the vibration', but mine comes in more like buffeting like you left a window open. I was going to sit tight till 4500 miles (oil change 1) but it seems like it's getting worse. It does it without fail at 32mph. I'll keep everyone posted. The car is parked outdoor on a flat surface and temps have been in the 70's. It seems worse going around a corner or it's just spooking me while in the corner as my speed passes over/under 32 mph namely roundabouts. I get what feels like the flat spotted tire vibration from overnight but that goes away in about 1/4 - 1/2 a mile.

 

[arcman]

To those above,

Go back and read my original post. The car had a nasty vibration at 29 mph with NO wheels on it, hence the title. Disconnected the rear driveshaft and the vibration was gone.

 

[armourben]

To those above,

Go back and read my original post. The car had a nasty vibration at 29 mph with NO wheels on it, hence the title. Disconnected the rear driveshaft and the vibration was gone.

Agreed, seems to be a driveshaft/coupler issue. Even put new tires on it before I was aware of this thread and no improvement.

Im not sure where to go from here, except bring back to Hyundai and but I’m doubtful that’ll be productive.

Any thoughts as to where to go from here, or do I just need to accept the vibration and move on?

 

[armourben]

Brought the car into the dealership and they replaced the drive shaft under warranty. Didn't notice any issues driving home from the dealer but after leaving the car parked for two nights the issue is still there.

Like many have already reported, the replacement driveshaft is worse than the original - the "shuttering"/vibration sound is less audible, but the vibration is much more prominent. I can feel it in the center console and even in the seat.

I feel like I'm going around in circles here; perhaps they'll replace or balance the drive shaft but I highly doubt anything will improve after the car sits...

Any additional thoughts?

 

[ChinDynasty]

I will keep mine with me and away from dealerships. Obviously, there is no fix for this.

Brought the car into the dealership and they replaced the drive shaft under warranty. Didn't notice any issues driving home from the dealer but after leaving the car parked for two nights the issue is still there.

Like many have already reported, the replacement driveshaft is worse than the original - the "shuttering"/vibration sound is less audible, but the vibration is much more prominent. I can feel it in the center console and even in the seat.

I feel like I'm going around in circles here; perhaps they'll replace or balance the drive shaft but I highly doubt anything will improve after the car sits...

Any additional thoughts?

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[arcman]

Well... that's really disappointing to hear. I've been on the edge the last few weeks on buying a new driveshaft. I guess that's on hold now.

Being the non trusting type, I'd get the car up in the air or use your phone on a selfie stick and take pics of the flex-discs (guibo) to see if they're new.

Action Machine in Indiana told me they will build a new two piece shaft with center bearing and balanced, they claim for under $500 but need to see an existing one first.

Looks like it's time to do some more digging. I tried like hell to find an email address for Dae-Seung in Korea (the shaft manufacturer) with no luck. I will call Dana/Spicer again. There was no staff for months.

I made this to balance the guibo. Currently, Action can't balance a shaft with three bolt guibos. I will call them and see if I supplied two of these, maybe they can use them in the balancing lathe chucks.





There is a fix for this. Most of these cars don't have this problem or there would have been a recall and a fix a long time ago.

 

[armourben]

This is from an owner on one of the genesis forums who contacted customer service concerning the vibration. At least they are acknowledging there’s an issue, just wish they would give a more concrete timeline though...

”Finally got a callback from Genesis customer service. I was told South Korea engineering is working on a fix and they will be issuing a TSB Sometime. They don’t feel it’s a safety issue and they will not re-purchase my car. They admit to the issue and claim replacing transmissions driveshaft and rear axles has not solved anything. They invited me to file complaint or lemon law thr car”

 

[dboz1031]

My car is back in the shop for 7 days now. Problem was getting worse. No word on a fix, they aren't sure it's fixable yet. They are waiting on Hyundai technical for some answers. I have done this several times before and they have no answers. I cannot understand it being the driveshaft if it's nor affecting every car and a new shaft does not fix it. My car can shake even while stopped. I still think it's the converter but they refuse to replace it. I am being adamant this time but will see what tech comes up with. Car has 30k miles. Disgusted with this thing but refuse to take a bath on it. Its under warranty so fix the damn thing! How hard can it be for them to fix the shaft if that is the issue? This is ridiculous.

 

[tlivingd]

Update on mine. Dealership claims they can't feel the vibration but roadforce balanced 4 tires and found 3 bad tires (1 front 2 rear) (5700 miles btw). 32mph vibration still there but seems less pronounced, however the new tires introduced a high speed shimmy in the steering wheel and it feels less smooth overall. gebus christ...

 

[tlivingd]

My car is back in the shop for 7 days now. Problem was getting worse. No word on a fix, they aren't sure it's fixable yet. They are waiting on Hyundai technical for some answers. I have done this several times before and they have no answers. I cannot understand it being the driveshaft if it's nor affecting every car and a new shaft does not fix it. My car can shake even while stopped. I still think it's the converter but they refuse to replace it. I am being adamant this time but will see what tech comes up with. Car has 30k miles. Disgusted with this thing but refuse to take a bath on it. Its under warranty so fix the damn thing! How hard can it be for them to fix the shaft if that is the issue? This is ridiculous.

FYI driveshaft won't vibrate unless you're moving. Torque converter does rotate if car is in park. vibration will also change with RPM if torque converter. (Traveling same speed in a different gear) or in neutral and you change engine RPM.

 

[dboz1031]

The vibration is in the 25-30 MPH zone, I shift gears at that speed between 3rd and 4th, it does not change the vibration so I rule out the transmission. I get the car shaking bad at 25-30. I feel it at other speeds but much more subtle. Sometimes on the highway I will just suddenly get steering wheel vibration, it will go away just as suddenly. Sometimes I feel it 40-45 MPH. Sometimes my car will shake while sitting at a light. Its worse if pointed down a steep grade. I come to the conclusion it is the torque converter is not locking up. No idea why they refuse to just change it to appease me. Its is NOT the driveshaft with my car. So maybe I have another issue. I have had 3 driveshafts, rear diff and transfer case replaced. None resolved the issue. No one else can feel the issues outside of the 25-30 zone because its too faint for them to be aware because they don't drive it everyday. It is also sporadic when sitting at a stop so hard to get it to reproduce that. Sometimes it will do it everyday sometimes my car is perfectly smooth even in the 25-30 zone. That is why I thought the flex joint may be a fix, IF my car stopped at some perfect spot where it would not distort. I cannot imagine why ALL cars would not have this issue if that is the problem? And NO, it is not the tires, or the balance or flat spots.

 

[TinsleyC]

Dboz, that is crazy! Hoping for the best.

 

[tlivingd]

After blowing up on the service manager and his dealer system general service manager after the GSM said they felt it but said it wasn't any worse than a brand of domestic luxury car, and after they've replaced 3 tires since 3 of them failed road force balance, then re road force balancing the 3 of the new ones after the new tires introduced a shimmy at high speed and they over inflated the tires causing a buzzy feel in the wheel and suspension. And me saying if they don't put it on a lift and run it to speed I'm doing to do it to check the drive shaft. They finally put it on a lift. The service tech finally felt the issue and called Genesis/Hyundai service tech assist line. The tech line asked them to check the grease on the spline in the drive shaft and clock the spline one tooth over and repeat a few times to determine what happens and hopefully removes the shake and to add grease to the spline. If it fails, I'm told they will replace half the drive shaft (I'm not sure what half) . To me, at least it's starting to move forward. Makes me wonder if their drive shaft vendor has a worn out piece of tooling used to make these later year shafts.

EDIT: I do not have an engine speed dependent problem as I can shift gears to change RPM and traveling speed stays the same and I still have the same vibration.

 

[arcman]

Pretty sure the driveshaft is balanced as a whole. I picked up a used one and others I've seen in photos all have a yellow paint stripe lining up both halves. Have them replace the entire shaft.

 

[dboz1031]

I have had 3-4 driveshafts, good luck, they did not fix my issue.