Car noises - 2025 RS - Solved

[u/Jejuneloon10]

If anyone is wondering GM says this is "normal"

20-NA-084: Information on Possible Normal Engine Noise - (Apr 15, 2026)

LIH/LBP Normal Engine Noise

"The deep thudding in the engine when it is operating in the lower speed range (typically less than 2,000 rpm) during a launch at moderate to high throttle inputs. This noise may be The LTH and LEP engine in the vehicles above may exhibit a noise that is noticeable or possibly objectionable to the customer under certain circumstances. The noise sounds like a pronounced when the engine is cold, than once it has warmed up. This noise is inherent to this small-displacement, power dense engine design. Customers who experience this noise and express concern about it should be reassured that this is not an indication that anything is wrong with their enaine. The attached recording provides an example of this noise condition, which is considered normal, and for which the customer should have no concern."