BerkeleyBowlt
Posts: 24
Joined: Mon Feb 20, 2017 7:02 pm

Broken rear axle weld causing sound when turning

Thu Jul 20, 2017 11:08 pm

Around the 3,000 mile mark, my Bolt started making a "metal hitting against metal" sound from under the rear of the car when the weight of the car shifted from left to right and vice-versa, such as when going around corners. It wasn't very loud, but imagine a sound similar to hitting a metal pipe with a small tack hammer in the distance.

The ride didn't seem affected to me, but I eventually took it in to the dealer, who after much effort diagnosed it as something like this explanation:

The rear axle is made of a strong bent tube (a torsion beam suspension), and a metal piece from the wheel fits into that tube and is welded in place. The weld has somehow broken, and the metal part is moving slightly inside the axle tube as it flexes, resulting in the noise.

They said it's not a safety issue because the metal part is long and can't come out of the tube, but it should be fixed to stop the noise and possibly improve the ride a little.

I didn't hit anything, etc., and the dealer said that the original weld was probably defective. In fact, they said GM is aware of this and published a service bulletin suggesting that dealers fix this by drilling a hole through the two parts and riveting them together... but the service bulletin has since been withdrawn for some reason. Instead, they ordered a new rear axle bar, which took a couple of weeks to arrive. The car is in the shop today getting it replaced under warranty.

If you hear such a noise, well, now you know!
Robert Mathews
Cajun Red Bolt Premier

User avatar
gbobman
Posts: 211
Joined: Tue Mar 28, 2017 9:18 pm

Re: Broken rear axle weld causing sound when turning

Fri Jul 21, 2017 4:44 pm

Thanks for the info!
2017 Chevy Bolt LT (1st EV!)
2004 Chevy Monte Carlo SS
(found a new home :cry: )

User avatar
Eriamjh1138
Posts: 39
Joined: Tue Jun 06, 2017 6:02 pm

Re: Broken rear axle weld causing sound when turning

Mon Jul 24, 2017 9:30 am

A picture of the broken weld would have been great, but I'll keep an eye out on this one.

A rivet cannot take the place of a weld. They eventually made the right call.

Did they give you a loaner or did you just continue to drive the car while you waited for the part?
2017 Kinetic Blue Metallic "Rainbow Dash"
Southeast Michigan, USA

TrngMchn
Posts: 3
Joined: Sat Apr 28, 2018 4:48 am

Re: Broken rear axle weld causing sound when turning

Fri Jul 27, 2018 11:56 pm

Thanks for the info. I have the same noise. 3 month old bolt, 3000 miles. Judging from your name you may live in Berkeley Calif? If so, that's odd as I also live there. Wonder if Berkeley's rough streets and hills might be part of the problem.
But , above all, did the dealer work fix the problem?
Which dealer did you take it to? Probably best for me if I just go to the same dealer , as long as it worked for you.

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