And the answer is, front sway bar link. Getting replaced today.
Well, my car is still in the shop. On top on everything they replaced already, they just put in a new subframe and still it didn't fix it. Talked to the service manager today and it sounds like it is going to be awhile before a field rep can come out and look. Everything GM has told them to look at hasn't solved the mystery clunk.
Sounds promising....
Hey all,
Purpose of this thread is to document specific progress on some ongoing issues to hopefully help those who may encounter this.
Problem 1
- Noise when going over multiple small bumps at speed of around 30 mph. This happens when hitting bumps with driver side only. Those in the southern states - noise is heard when you run over the lane marker "bumps" in the read. Noise is defined by metallic rattle similar to a loose exhaust but not diagnosed as such.
Solution - ongoing. Dealer took another Sonic for a ride with me (also a hatch like mine) and same noise was heard. I am currently in a loaner sedan and no similar noise is heard. Original issue appeared at about 1k miles.
Problem 2
- High pitched squeak coming from driver side front. Heard when going over small road bumps, dips and imperfections, where suspension undulations are minor.
Solution - dealer replaced front driver side strut assembly under warranty. Issue resolved - diagnosed as defective strut. Issue appeared at just under 2k miles. This occurred after Problem 1. Replacing the strut did not resolve the clunk or affect it in any way.
Problem 3
A very loud POP is heard while accelerating in low gear over uneven surfaces, such as railroad crossings. Sound is not always repeatable. Very loud and very metallic in nature. Also the the impact can be felt in both the driver and passenger floorboards. This will also occur at times under steady braking with no bumps in the road. In this scenario, the noise occurs well into braking, not immediately during weight shift when brakes are applied and before the car stops and weight shifts back.
Solution - ongoing. Car has been at the dealer for 2 days under examination. Initial day spent to resolve the problem yielded no results as I was advised that all appeared to be in check. Service manager was in vehicle with me when I was able to replicate the issue. Dealer is currently stumped on what is causing the severe noise as the issue is very apparent. Issue appeared at just under 2k miles.
So far dealer has been very responsive and I believe them to work attempting to resolve the issue and as best they can. I'll keep you guys posted to the solution.
P.S. I've asked them to look into the sway bar links and while I've not received a negative confirmation, it hasn't been officially ruled out.
2012 Sonic HB
1.4T 6 MT
Just over 2k miles on the odometer