C8 transmission noise

[Kkruzer]

So disappointing but it’s in the shop at 959km and waiting for GM response. Initial reply is likely transmission. Got the car in September 2025 and the car started making “noises” around 200km that sounded like a squealing bushing so I took it in to Cullen’s and they had no idea so said to drive it more and see if it goes away - it didn’t. I’m attaching a video (if it works) of the start up in October 2025. Anybody else have anything similar happen to them?

file:///var/mobile/Library/SMS/Attachments/98/08/43643AB5-D664-46AF-9162-D964FAD5C94F/IMG_3098.MOV

 

[Murray20c8]

So disappointing but it’s in the shop at 959km and waiting for GM response. Initial reply is likely transmission. Got the car in September 2025 and the car started making “noises” around 200km that sounded like a squealing bushing so I took it in to Cullen’s and they had no idea so said to drive it more and see if it goes away - it didn’t. I’m attaching a video (if it works) of the start up in October 2025. Anybody else have anything similar happen to them?

file:///var/mobile/Library/SMS/Attachments/98/08/43643AB5-D664-46AF-9162-D964FAD5C94F/IMG_3098.MOV

It didn't work. Click on the three dots and then the "Insert video" link to load a video.

 

[Kkruzer]

Thanks Murray. I converted the file to audio

 

[Rruuff Day]

So disappointing but it’s in the shop at 959km and waiting for GM response. Initial reply is likely transmission. Got the car in September 2025 and the car started making “noises” around 200km that sounded like a squealing bushing so I took it in to Cullen’s and they had no idea so said to drive it more and see if it goes away - it didn’t. I’m attaching a video (if it works) of the start up in October 2025. Anybody else have anything similar happen to them?

file:///var/mobile/Library/SMS/Attachments/98/08/43643AB5-D664-46AF-9162-D964FAD5C94F/IMG_3098.MOV

Welcome to the forum. Sorry to hear you're having DCT issues. We have had other C8 transmission issues reported here over the years ranging from control modules, leaks, right up to complete transmission failures. Luckily for you it is still under warranty as the repair costs can be astronomical. A total failure is reputed to be in the $25,000.00 range with repairs alone that can exceed $10,000.00 due to the complexity of that transmission. Let us know how it turns out for you.

 

[Murray20c8]

Thanks Murray. I converted the file to audio
View attachment 138902

Wow, That IS a weird sound.

 

[Dave91TM]

Wow, That IS a weird sound.

According to Yoda.."Healthy not it is"

 

[Murray20c8]

According to Yoda.."Healthy not it is"

"Healthy, it is not."
Based on Yoda's typical sentence structure (Object-Subject-Verb), he would place the focus on the state of healthiness first, followed by the subject and the verb.
... Not to derail the thread!