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Discussion Starter · #1 ·
I've got an '08 CTS, and I hearing a thumping noise coming from the passenger rear when I hit a manhole cover or bump in the road. It's driving me crazy! I took it to my mechanic and he tried everything to find it. He took the sway bar off & that wasn't it, then he took the strut off and checked it, that wasn't it either. We checked the trunk, the battery, the exhaust & everything else we can thing of and it's still making the thumping noise (He gave up). Has anyone ever had this problem?
 

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'14 CTS-V LongRoof; '16 ATS-V Sedan,' 04 Trailblazer 4x4; '10 CTS LongRoof gone but never forgotten
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19,081 Posts
Possibly your tire has a tread separation.
 

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2008 CTS
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I was having a clunking or thumping niose also on my 2008 CTS, took it into the dealer and they replaced the suspension knuckle on right rear just last week and this has eliminated the noise.
 
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