Quote:
Originally Posted by Joseph92
Key notes: I have the L99 engine with the automatic transmission. Stock Tune.
The issue I am having is this:
When driving and using the paddle shifters in manual mode. I would be at a complete stop and in first gear and as I accelerate and shift from 1st into 2nd, I get this sound that kinda sounds like pressure being released or like something is slipping (kinda like both at the same time). The sound is coming from the center of the car in the transmission area. The sound also varies in tone and length depending on the RPM (in 1st gear) when I shift into 2nd gear. (Example: In 1st gear at 4500RPMs I change to 2nd gear, the sound might last longer and be louder VS. in 1st gear at 3000RPMs and changing to 2nd gear.) I am only experiencing this when switching from 1st - 2nd gear. And if I where to give you a ratio of how often I can make it happen is about 8 times out of 10.
I have heard this sound in the past while in drive mode, but did not think much about it because it would happen so rarely. I am concerned now because after using the paddle shifters I finally pin pointed how to make the sound appear. I did not notice this earlier because I rarely use the paddle shifters.
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Very sorry to hear about this. I understand that you're seeking thoughts and opinions, but send me a message if you want to take it a step further and get an official diagnosis. I will then reach out to the dealer's Customer Care Specialist for additional assistance with potentially resolving this at the dealer level.
William R.
Chevrolet Customer Care