2023 Civic Si Turbo Replaced Twice in Under 32k Miles — Wastegate Actuator Buzz at 4k RPM
I wanted to share my experience and see if anyone else with an 11th gen Civic Si has dealt with this.
I originally posted about this issue here:
https://www.civic11forum.com/threads/help-buzzing-at-4k-rpm.7916/
At around 24,000 miles, my Civic Si developed a very noticeable buzzing/rattling sound right around 4,000 RPM. I posted videos of the noise at the time, and after working with the dealership, the issue ended up requiring a full turbocharger replacement. From what I understand, the problem was related to the wastegate actuator/wastegate assembly, but since Honda does not service that part separately, the full turbo had to be replaced.
For context, my car is:
2023 Civic Si
Bone stock
Original owner
Garage kept
Never tuned or modified
Not abused
Meticulously maintained
Mostly driven lightly since I work from home
Mainly used for school pickups, errands, and normal daily driving
I genuinely take very good care of this car. I baby it, keep up with maintenance, and it has never been driven hard or modified in any way.
Now, less than 10,000 miles after the first turbo replacement, the exact same issue has come back. The car is currently around 31,000 miles, and the buzzing/rattling at 4k RPM is happening again.
I took it back to the same Honda dealer, and this time they opened a case with Honda corporate/Tech Line. The process took quite a while, and the dealer has now had my car for over two weeks, but Honda finally approved another turbo replacement.
So at this point, my Civic Si is about to have its second turbo replacement before 32,000 miles.
I love this car more than any car I’ve ever owned. The manual transmission, handling, and overall driving experience are exactly why I bought an Si. But having the turbo replaced twice this early, especially on a completely stock and well-cared-for car, is honestly making me question long-term ownership.
Has anyone else experienced this 4k RPM buzzing/wastegate actuator issue on the 11th gen Civic Si?
Did the replacement turbo permanently fix it for you,
or did the noise come back again?
I’m curious if this is becoming a known issue or if I just got extremely unlucky twice.
YouTube videos of the noise on my Si: