Vibration at 30 mph

[Geno]

G-239813. I so feel your pain. New tires, a new transfer case, and a new driveshaft have not solved the vibration problem, and the steering is still binding up on mine. Only 35,000 miles on the car. Over $7K spent so far, and no resolutions.

So, I'm hoping that this will be my final post as concerns this car. Vibration issue still remains but much improved after replacing the transmission mounts. Finally replaced the steering rack with a new OEM one. That solved the binding problem, and the car finally steers and handles as it should. A total of $13K + later, I finally have a car that I can enjoy and that isn't a danger to myself or others.

 

[TinsleyC]

A total of $13K + later, I finally have a car that I can enjoy and that isn't a danger to myself or others.

That's dedication, glad it worked out for you. I would have traded it somewhere along that path, but I'm lucky and used to having cars that have needed little to no repairs over their life, except maintenance.

 

[Geno]

G-239813. I so feel your pain. New tires, a new transfer case, and a new driveshaft have not solved the vibration problem, and the steering is still binding up on mine. Only 35,000 miles on the car. Over $7K spent so far, and no resolutions.

Update: A new steering rack solved the binding issue, but driveshaft replacement, new transfer case, and new transmission mount still haven't solved the vibration issue. I'm just living with it. Over $13K invested. I may have to keep this car forever.

 

[dawber]

2018 Genesis G80 AWD 3.8L 75,000 miles

Vibration at 30mph, 40, 72/73mph was very strong

Dealership tech blamed Tires, even though I had the problem with Falken tires with 30k miles of wear on them, and then brand new Goodyear tires, vibration was consistent regardless of tire.
Insisted tech go for ride, Tech admits it is more than tires, needed consult from senior tech, took 2 visits.

Driveshaft was replaced under 3rd party warranty.
Vibration continued at same speeds, but the intensity is 1/2 of what it was previously.
Dealership insists it is the tires.

Tire shop replaces brand new Goodyear tires, with another set of 4 brand new Goodyear tires.
Vibration unchanged, Dealership insists it is the tires.

Brought the car to a driveshaft specialist, they determined that the brand new, warranty replaced driveshaft was "out of round", defective, but not tied to dealership workmanship, just a bad part from the supplier.
Written and Video evidence offered to Genesis Dealership, they refused to even view it because they do not trust any diagnosis outside of their own techs, but agree to replace part as "fix part failure"
2nd brand new driveshaft installed
Vibration continues, intensity is 1/2 of 1/2 but is still present at the same speeds, so went from like an Intensity 8, to a 4, now at a 2.
Pursuing Genesis to pay for 3rd party diagnostic (advised by warranty company), but I will likely need to take that loss.
Tech says residual vibration, is the tires, and now claims he never felt anything different from the beginning. (it was night and day, like spill your coffee if it was on the dash vibration at 73mph, down to Jurassic Park ripples on the top of the coffee cup)

After 3rd party diagnostic payment is sorted out, I Intend on calling other Genesis dealerships to see if any of the ones near me, will be up front with me and honestly let me know if any of their techs have real driveshaft / propeller shaft expertise.

The fact that the vibrations intensity is noticeably improved, leads me to believe they are working on the right component.

Since the driveshaft was replaced by the dealer, and covered by extended warranty, no other shop will now be paid for subsequent replacement of that same part under that warranty, only a dealer can now repeat that same repair and have it covered.

 

[TinsleyC]

Have you seen this thread, below? It's post #32 on this thread.

I'd say Genesis has a known problem with their early G80's. Luckily, my '19 base G80 has not experienced it.

Thread 'Say Goodbye to the Flat Spotted Tires / Shuttering Theory' Say Goodbye to the Flat Spotted Tires / Shuttering Theory

 

[dawber]

Have you seen this thread, below? It's post #32 on this thread.

I'd say Genesis has a known problem with their early G80's. Luckily, my '19 base G80 has not experienced it.

Thread 'Say Goodbye to the Flat Spotted Tires / Shuttering Theory' Say Goodbye to the Flat Spotted Tires / Shuttering Theory

Thanks Tinsley, I did see that post.

The experts over at Gilbert Driveline in Manchester NH (great folks) were given the driveshaft when it was off the car from the auto shop I had taken it to. The brand new driveshaft on their test harness, at just 50 RPM was wobbling all around in the middle. They were shocked that the car didn't drive like a washing machine on spin cycle with how far off it was.

There may be additional parts in my car that are failing, but the driveshaft guys were 100% positive my defective driveshaft, was replaced with a brand-new defective driveshaft.

 

[arcman]

Back when I was going through this, I had no luck finding any driveshaft shop who would tackle this two piece shaft with Guibos.

Since you went to the trouble to remove it and found someone to fit yours up... I assume they attempted to balance it? Results?

 

[dawber]

Back when I was going through this, I had no luck finding any driveshaft shop who would tackle this two piece shaft with Guibos.

Since you went to the trouble to remove it and found someone to fit yours up... I assume they attempted to balance it? Results?

The driveshaft shop advised me to initiate a return/RMA on the brand-new driveshaft instead of attempting a repair, that return could only be performed by the dealership that ordered the part. So the dealership RMa'ed the part, and put what is now the 3rd driveshaft (original, replaced, re-replaced) into my vehicle.

The 3rd driveshaft I have in my car now still has vibration. I am not sure how to get this fixed without losing more money than I already have spent on the extended warranty and the initial 3rd party diagnostic. If I had the money, I would have the driveshaft specialist do whatever it took to custom mod the brand new driveshaft so that it was perfect off the car, and then have it installed by a non-dealership trusted auto shop.

 

[arcman]

I'm surprised how soft the center bearing support is seeing it's new. Either that or that's a heavy duty vibration.

I picked up a used driveshaft back when I was more serious about this situation (I think I may have posted a pic somewhere along the line) and it had sagged quite a bit in the housing. I thought about beefing it up via adding pieces of a large/thick O-ring.

The most interesting post was by a guy who cut his shaft apart and found what must be an internal damper that had failed. Unfortunately he never provided any photos. I was tempted to cut my spare apart but decided against it because it may have been good (doesn't make any noise when I shake it) vs. the one currently in the car (that I've never removed). I just got lazy and gave up on the whole deal.

I (fortunately) never had a vibration that was noticeable when driving... just the clicking (and it changed speed after I changed the Guibo). I'm so used to it, I hardly notice it any more. Good to hear you've got yours down to a acceptable level.

It's a shame the driveshaft shop didn't hose clamp some weights on that thing for you to test before replacing it.

 

[TinsleyC]

Thanks Tinsley, I did see that post.

The experts over at Gilbert Driveline in Manchester NH (great folks) were given the driveshaft when it was off the car from the auto shop I had taken it to. The brand new driveshaft on their test harness, at just 50 RPM was wobbling all around in the middle. They were shocked that the car didn't drive like a washing machine on spin cycle with how far off it was.

There may be additional parts in my car that are failing, but the driveshaft guys were 100% positive my defective driveshaft, was replaced with a brand-new defective driveshaft.

So, based on what you've seen, would you say the driveshaft is just poorly designed? If so, I can see why Genesis doesn't want to touch it.

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[dawber]

So, based on what you've seen, would you say the driveshaft is just poorly designed? If so, I can see why Genesis doesn't want to touch it.

From a non-mechanic point of view, it seems like the vendor of the driveshafts changed something in their design, parts, or assembly and it is resulting in faulty new parts being supplied. There are a lot of forums online where the dealership fails to figure this out, and for newer cars, ends up having to buy them back from the owner. Unfortunately for me, I am within an aftermarket warranty, and this issue arose 16k outside of the manufacturer's warranty.

 

[Genesis5]

New driveshaft under warranty at 73K done this weekend. We'll see if the vibration issue is gone for good.