Hill assist?
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Joined: Jul 2024
Posts: 72
Likes: 16
From: The Villages,Florida
Hill assist?
This may have been discussed before, but I am a bit puzzled as to why I get a very scary noise..almost like my transmission just fell to the ground..Not sure if this normal? Every time I Back into my garage, which is on low grade incline, and I stop to readjust I get this sound..could it be my hill assist? Can not seem to turn it off..thoughts please..it is 2024 Z51,HTC..
Last edited by Rogerutley; Apr 30, 2025 at 10:16 AM. Reason: ADD INFO
Race Director
Joined: Mar 2007
Posts: 11,402
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This may have been discussed before, but I am a bit puzzled as to why I get a very scary noise..almost like my transmission just fell to the ground..Not sure if this normal? Every time I Back into my garage, which is on low grade incline, and I stop to readjust I get this sound..could it be my hill assist? Can not seem to turn it off..thoughts please..it is 2024 Z51,HTC..
If you are on a sufficient incline, and stopped fully (which I assume is what you mean by stop to readjust), the hill start assist will hold the brakes (the regular bakes, not the EPB) when you take your foot off the brake and move it to the accelerator pedal. And, it will not release the brakes until you press the throttle - at which time the car will try to go and the brakes will release. The timing is imperfect, so there is already pressure on the drivetrain before the brakes release - the noise you hear is that driveline tension releasing (if you are hearing the normal noise).
If you stop for too long ("a few minutes") it will actually apply the EPB as well. If that gets applied, it too will release when you apply throttle pressure, but that noise and transition will be little rougher.
It can't be disabled.
"When the vehicle is stopped on a grade, Hill
Start Assist (HSA) prevents the vehicle from
rolling in an unintended direction during the
transition from brake pedal release to
accelerator pedal apply. The brakes release
when the accelerator pedal is applied."
Racer
Joined: Mar 2014
Posts: 262
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From: Huntsville, Alabama
I usually have hill assist work when I pull into my garage going forward and it doesn't make that much noise. it appears that your hill assist has already released as the car rolls forward before you start going back and the noise occurs.
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Joined: Mar 2010
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If you are unable to identify the source of the noise, it is best to take your Corvette to a Chevrolet dealership for a diagnosis. As they are the experts with all GM vehicles, they will be the best source for assistance. Should you need help connecting with one in your area, feel free to email us at socialmedia@gm.com with your Username and Forum title in the subject line.
Thread Starter
Advanced
Joined: Jul 2024
Posts: 72
Likes: 16
From: The Villages,Florida
Update
Update on my issue with clunk sound. I had thought it only Made this noise when on a slight incline..Now I realize it doing to do with hill assist…it happens every time I am in reverse, and give it moderate gas. I get the loud clunk..I know I need to take it to dealer, but want to do some research before I do. Thanks in advance
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