Vibration at highway speeds - Chevy Bolt EV Forum
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post #1 of 6 (permalink) Old 12-15-2018, 02:02 PM Thread Starter
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Vibration at highway speeds

I bought my 2019 Bolt LT new in Oct, and since day 1 it's had a small vibration at highway speeds above ~62 mph - most noticeable on smooth roads - I feel it in the steering wheel, driver's seat - less in the passenger seat but still there - not really bad but annoying on my daily commute and especially on long trips.

Checked tire pressures - all good - I thought maybe just some time was needed for everything to settle in, but after a couple of months and a couple of thousand miles I took it to a local dealer - they confirmed the vibration and rebalanced the wheels - data from the service tech notes:

-----------------------------
...R/F OUT .25OZ- GOOD ROAD FORCE=8LBS. REBALANCE NOW OK. R/R OUT .25OZ 9LBS ROAD FORCE- REBALANCE NOW OK L/R OUT .50OZ -18LBS ROAD FORCE, VECTOR L/R TIRE TIRE REBALANCE 16LBS ROAD FORCE NOW OK. L/F OUT .25OZ 27LBS ROAD FORCE VECTOR TIRE GOT DOWN TO 21LBS ROAD FORCE REBALANCE TIRE NOW OK...
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Vibration still there - next they took the wheels/tires off a new 2018 Bolt and put them on my 2019 (they didn't have a 2019 in stock) - vibration still there - put the 2018 wheels/tires back on the 2018 and drove it - turned out that the 2018 has a similar vibration around ~58 mph - they let me drive the 2018 to confirm it - they ran a pico scope on both cars and will submit a "field product report" to GM - they said it could be weeks before they hear back from GM on next steps...
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post #2 of 6 (permalink) Old 12-16-2018, 02:11 AM
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I had the exact same problem with a Ford I bought over a decade ago. It took I think three dealers to find one that had a competent tech that knew how, or cared enough to properly balance a wheel. Your problem is a wheel balance issue and just because they said they balanced them, doesn't mean they knew what they were doing and did it right. There is an art to properly balancing rotating things and most shop monkeys just don't care that much. They just do whatever the computer read out says on the first go and leave it at that. You will eventually get that guy that will take the time, do it right and it it will all go away.

Annoying, I know.
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post #3 of 6 (permalink) Old 12-16-2018, 10:22 AM
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Funny, I get that now after they replaced the Stabilizer links on recall.

I will have to go out and see if a balance weight is gone........

-Lin
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post #4 of 6 (permalink) Old 12-16-2018, 03:22 PM
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Quote:
Originally Posted by Lin19687 View Post
Funny, I get that now after they replaced the Stabilizer links on recall.

I will have to go out and see if a balance weight is gone........
This is why I tell the techs to mark the tire location before rotating
tires. If the car pulls or has a vibration complaint, they can put the
tires back where they were and see if that corrects the issue.

It's difficult to get tires properly balanced in today's marketplace.
Everyone is in a hurry. If the shop pays flat rate, the job is never
done properly. I've watched techs balance tires using the single spin
and balance method to save time. It usually results in a complaint.

There is never enough time to do it right the first time, but there is
always time to do it over. The 2nd spin method works best, if the tech
actually uses it and corrects the measured imbalance when the machine
picks it up. Some will do the 2nd spin to check if they located the weight
in the correct spot, but allow a 1/4 ounce out to hit the street.

I mount and balance all my own tires. I balance down to 1/10th
of an ounce and never have problems. My motorcycles are never
allowed to have tire balance issues. 100+ MPH will really make a
poorly balanced tire feel like a bent wheel.

Costco it the biggest offender of poor balancing practices.
They did the wife's car and 2 tires were out by more than .75 of
an ounce. @ 70 MPH the mirrors were vibrating.
I had to re-balance all 4 tires myself to fix it.

2017 Loaded Premier in Summit White

Last edited by drdiesel1; 12-16-2018 at 03:24 PM.
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post #5 of 6 (permalink) Old 12-16-2018, 03:39 PM
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Experienced one tire shop that nearly ruined a set of aluminum rims years ago by using an impact wrench. Car was vibrating because the bolt holes had been elongated and the wheel was no longer centered on the car. No amount of balancing would fix it. Got a set of hub centering rings to get the rims to run true again. Then another tire shop lost one of the centering rings. I hate tire shops. Have horror stories of broken studs, lost weights, tires going flat, bad balancing, etc. Finally found one that has yet to mess up and consequently they get all my business.
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post #6 of 6 (permalink) Old 05-18-2019, 10:30 AM Thread Starter
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Update: After 5 months of back/forth with the dealer and GM Customer Assistance, waiting for new tires to come in, etc, last week they replaced two tires that had high road force readings - vibration is still there but now reduced to a level I can live with for now - otherwise the car's fun to drive - love the one-pedal mode.
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