G80 rear vibration

[Billson]

It's the driveshaft coupler. It hardens, vibrates when not loosened up yet, then smoothes out after warming up.

Keep us updated.

I think it's the driveshaft coupler too, because it smooths out after warming up. I went to the dealer, and they said they'd have to replace the driveshaft, to the tune of $1800. Mine is a 2017 G80 AWD; is there any way to find out if the coupler can be had separate?

 

[Billson]

It's the driveshaft coupler. It hardens, vibrates when not loosened up yet, then smoothes out after warming up.

Keep us updated.

I found a TSB dated September 2020, for 2017-2018 G80 AWD vehicles. It talks about checking the propellor shaft angle, but, it says for cars produced before September 12, 2018, which of course my 2017 was, to just go ahead and replace the propellor shaft, then check to see if the vibration is gone. If not, then check the shaft angle.

 

[TinsleyC]

Yes the driveshaft couplers can be bought separately.

I wonder how it will affect the car if you turn it off in neutral and set the parking brake. That way there should be less stress on the driveshaft & coupler while it sits.

This isn't my theory; these ideas have been discussed on the forum.. but it makes sense to me.

My car doesn't have these issues, but it's a base 3.8. Or maybe I'm just lucky!

 

[Billson]

Yes the driveshaft couplers can be bought separately.

I wonder how it will affect the car if you turn it off in neutral and set the parking brake. That way there should be less stress on the driveshaft & coupler while it sits.

This isn't my theory; these ideas have been discussed on the forum.. but it makes sense to me.

My car doesn't have these issues, but it's a base 3.8. Or maybe I'm just lucky!

Thanks for the tips; I haven't been able to find the couplers separately. Do you know where I can look?

 

[Billson]

Just got back from Hyundai/Genesis dealer. Parts department says this vehicle (2017 G80 AWD) doesn't use driveshaft couplers. The guy knew what I was talking about, but he says it just attaches with metal flanges. Guess I'll pay for a diagnostic next week and see what they suggest.

 

[ultimatequeen]

I noticed some vibration consistently within driving at low speeds, especially when first starting the car. But pushing this car to high speeds tends to ease the vibrations, I agree!

Mine vibrates inconsistently. Hard acceleration smooth as butter. Mild to medium acceleration and it vibrates like crazy from 50-60

 

[Billson]

I took it in a week ago and they said it's the tires; out of balance. These tires are only several months old. Goodyear Assurance ComfortDrive. They balanced them, said that should take care of it, but of course it didn't. I can feel it anywhere from 20-30 mph on up, then it smooths out after driving it 10-15 minutes. Took it back and they're still blaming the tires; they say these Genesis cars are 'sensitive' to tires! They suggest either live with it or buy new tires. 2017 G80 3.8 AWD, 59k miles.

 

[EdMay]

Hi all, I've got a 2017 G80 with 3.8. I have had this similar vibration for a few years not. It's recently gotten a little worse. I talked with a Service manager at one dealer, he told me it was tire flat spotting, I have recently changed the tires and still have the issue. I have had the same vibration across 3 sets of tires: cold, for a few miles, then goes away. Continental extreme contact DWS 06, Michelin Pilot Sport 4 all season, and now Michelin Cross Climate 2. Took it to the dealer again.

They said they confirmed a vibration but need to confirm/identify it with a special vibration analysis tool from Genesis. They got the tool and drove it. They say now that the tool was to check driveshaft angle, not to identify vibrations. They assure me that they checked everything they possible could including u joints, driveshaft angle and balancing tires (even though I told them the tires were just put on a week ago, but I suppose they had to rule out the installers balancer could have been off...) Anywho, they are sticking to the explanation that it's tire flat spotting.

Now, I am a retired GM Certified World Class tech and I took an in depth 2 day hands on course on vibration correction. Including using a reed tachometer that's placed on a hard surface of the vehicle while driving to identify the specific hertz of a vibration. It has a series of flat metal bars in it that are tuned to vibrate at different frequencies/Hertz. The frequency of the vibration can be used to calculate whether the vibration is happening at wheel speed or driveshaft speed. A compound wheel/tire vibration can feel like a high frequency driveline vibration if the tire or wheel is out of round, has excessive runout and or has complex imbalances including road force variation.

So when I say I think my G80 has a driveline vibration, (a higher frequency than a typical tire vibration) I'm speaking from experience BUT I don't have a reed tach to confirm this and apparently, neither does Genesis. I wonder why? This tool can really be the final word and provide valuable information in a vibration identification. ANYWHO, I am trying to find out if the rear driveshaft has a rubber coupler but I am getting conflicting answers from people/internet searches. I guess I will have to look at it myself to determine this. Then, if it does have one, I am wondering how the dealer is rulling that out?

I am also interested in the bulletin that Risktk1r posted since it applies to 2015 and 2016 vehicles but shows a 2018 build date cutoff in the flow chart??? Does this apply to my 2017 if it was built before Sept 12, 2018? If so, I would expect the dealer to replace the driveshaft and re test. Well, enogh for now, I hope this info has helped some of you. I will let you know where it goes from here. I have attached a link to a similar reed tach being sold on ebay to give you an idea of what I'm talking about.

FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm | eBay

Find many great new & used options and get the best deals for FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Jackmccrory]

Hi all, I've got a 2017 G80 with 3.8. I have had this similar vibration for a few years not. It's recently gotten a little worse. I talked with a Service manager at one dealer, he told me it was tire flat spotting, I have recently changed the tires and still have the issue. I have had the same vibration across 3 sets of tires: cold, for a few miles, then goes away. Continental extreme contact DWS 06, Michelin Pilot Sport 4 all season, and now Michelin Cross Climate 2. Took it to the dealer again.

They said they confirmed a vibration but need to confirm/identify it with a special vibration analysis tool from Genesis. They got the tool and drove it. They say now that the tool was to check driveshaft angle, not to identify vibrations. They assure me that they checked everything they possible could including u joints, driveshaft angle and balancing tires (even though I told them the tires were just put on a week ago, but I suppose they had to rule out the installers balancer could have been off...) Anywho, they are sticking to the explanation that it's tire flat spotting.

Now, I am a retired GM Certified World Class tech and I took an in depth 2 day hands on course on vibration correction. Including using a reed tachometer that's placed on a hard surface of the vehicle while driving to identify the specific hertz of a vibration. It has a series of flat metal bars in it that are tuned to vibrate at different frequencies/Hertz. The frequency of the vibration can be used to calculate whether the vibration is happening at wheel speed or driveshaft speed. A compound wheel/tire vibration can feel like a high frequency driveline vibration if the tire or wheel is out of round, has excessive runout and or has complex imbalances including road force variation.

So when I say I think my G80 has a driveline vibration, (a higher frequency than a typical tire vibration) I'm speaking from experience BUT I don't have a reed tach to confirm this and apparently, neither does Genesis. I wonder why? This tool can really be the final word and provide valuable information in a vibration identification. ANYWHO, I am trying to find out if the rear driveshaft has a rubber coupler but I am getting conflicting answers from people/internet searches. I guess I will have to look at it myself to determine this. Then, if it does have one, I am wondering how the dealer is rulling that out?

I am also interested in the bulletin that Risktk1r posted since it applies to 2015 and 2016 vehicles but shows a 2018 build date cutoff in the flow chart??? Does this apply to my 2017 if it was built before Sept 12, 2018? If so, I would expect the dealer to replace the driveshaft and re test. Well, enogh for now, I hope this info has helped some of you. I will let you know where it goes from here. I have attached a link to a similar reed tach being sold on ebay to give you an idea of what I'm talking about.

FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm | eBay

Find many great new & used options and get the best deals for FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Mine was a 2020 which followed my 2017 both had the identical problem. When I spoke with Genesis, they informed me that it was a known issue and they gave me zero problems, lemon law in the car and a full refund.

 

[TinsleyC]

These dealerships sure do differ in their diagnostic opinions and recommended repairs.

Like, something simple as the free oil change in the first 3 years - Genesis corporate told me it was up to dealership to choose what kind of oil to put in my G80, and said it's up to them if they want to charge me extra to use synthetic, which the owner's manual says to use.

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[Upstairs9401]

Hi all, I've got a 2017 G80 with 3.8. I have had this similar vibration for a few years not. It's recently gotten a little worse. I talked with a Service manager at one dealer, he told me it was tire flat spotting, I have recently changed the tires and still have the issue. I have had the same vibration across 3 sets of tires: cold, for a few miles, then goes away. Continental extreme contact DWS 06, Michelin Pilot Sport 4 all season, and now Michelin Cross Climate 2. Took it to the dealer again.

They said they confirmed a vibration but need to confirm/identify it with a special vibration analysis tool from Genesis. They got the tool and drove it. They say now that the tool was to check driveshaft angle, not to identify vibrations. They assure me that they checked everything they possible could including u joints, driveshaft angle and balancing tires (even though I told them the tires were just put on a week ago, but I suppose they had to rule out the installers balancer could have been off...) Anywho, they are sticking to the explanation that it's tire flat spotting.

Now, I am a retired GM Certified World Class tech and I took an in depth 2 day hands on course on vibration correction. Including using a reed tachometer that's placed on a hard surface of the vehicle while driving to identify the specific hertz of a vibration. It has a series of flat metal bars in it that are tuned to vibrate at different frequencies/Hertz. The frequency of the vibration can be used to calculate whether the vibration is happening at wheel speed or driveshaft speed. A compound wheel/tire vibration can feel like a high frequency driveline vibration if the tire or wheel is out of round, has excessive runout and or has complex imbalances including road force variation.

So when I say I think my G80 has a driveline vibration, (a higher frequency than a typical tire vibration) I'm speaking from experience BUT I don't have a reed tach to confirm this and apparently, neither does Genesis. I wonder why? This tool can really be the final word and provide valuable information in a vibration identification. ANYWHO, I am trying to find out if the rear driveshaft has a rubber coupler but I am getting conflicting answers from people/internet searches. I guess I will have to look at it myself to determine this. Then, if it does have one, I am wondering how the dealer is rulling that out?

I am also interested in the bulletin that Risktk1r posted since it applies to 2015 and 2016 vehicles but shows a 2018 build date cutoff in the flow chart??? Does this apply to my 2017 if it was built before Sept 12, 2018? If so, I would expect the dealer to replace the driveshaft and re test. Well, enogh for now, I hope this info has helped some of you. I will let you know where it goes from here. I have attached a link to a similar reed tach being sold on ebay to give you an idea of what I'm talking about.

FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm | eBay

Find many great new & used options and get the best deals for FRAHM REED TACHOMETER James G BIDDLE CO. T-22 3000 to 6000 rpm at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Did you fix your issues?