Rolled when I put it Drive
Thread Starter
Le Mans Master
Joined: Sep 2017
Posts: 5,767
Likes: 2,968
From: Rural NW Georgia. GO DAWGS!
2024 C8 of the Year Finalist - Unmodified
Rolled when I put it Drive
Yesterday I was backed into a parking spot that had a very slight incline towards the curb. I got into the car, started it, put it in Drive, and when I took my right foot off the brake it immediately rolled backwards. It felt exactly like I had a manual transmission and had let off the brake with the clutch engaged. I let my foot off the brake again and the rear tires rolled into the curb which stopped the car. I know the car has hill start assist on it but this incline wasn't nearly steep enough to engage it, and if it engaged the car should have never rolled back. The hill rollback control did not engage either.
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
Popular Reply
Jan 23, 2022, 04:05 PM
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,185
From: Central Illinois
Just trying to help, don't load the parking pawl with the weight of the car. If it isn't on flat ground, set the parking brake, let off the brake pedal, then put it in park. It's a LOT easier on the transmission.
Melting Slicks
Joined: Nov 1999
Posts: 2,924
Likes: 361
From: Mayer, AZ
Yesterday I was backed into a parking spot that had a very slight incline towards the curb. I got into the car, started it, put it in Drive, and when I took my right foot off the brake it immediately rolled backwards. It felt exactly like I had a manual transmission and had let off the brake with the clutch engaged. I let my foot off the brake again and the rear tires rolled into the curb which stopped the car. I know the car has hill start assist on it but this incline wasn't nearly steep enough to engage it, and if it engaged the car should have never rolled back. The hill rollback control did not engage either.
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
Safety Car
Joined: Nov 2021
Posts: 4,309
Likes: 3,830
From: Northern Illinois
I do kmow there is a lot of play in the transmission. My driveway has a slight incline and when I put it in park it has a tendency to roll backwards about 8 inches then bang when it finally hits the parking pawl.
Race Director
Joined: Feb 2004
Posts: 11,043
Likes: 2,592
From: Del Boca Vista FL
You don’t have a master cylinder reservoir for fluid with electric brakes.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,185
From: Central Illinois
Just trying to help, don't load the parking pawl with the weight of the car. If it isn't on flat ground, set the parking brake, let off the brake pedal, then put it in park. It's a LOT easier on the transmission.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,185
From: Central Illinois
That sounds more like transmission than brakes, several have had DCTs that acted that way. It doesn't have electric brakes, the boost is. Just like it has electric power steering, it still has a steering shaft going to a gear box and out to the spindles with tie rods. It just has the boost that's electrically controlled.
Race Director
Joined: Sep 2016
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The brakes are still hydraulic. The have electric boost, instead of vacuum boost, (GM calls it e-boost) but the system is still hydraulic.
Race Director
Joined: Aug 2016
Posts: 12,840
Likes: 10,252
From: Garden Valley CA
I wonder if someone will have something similar happen on the C8 where there isn't enough hydraulic pressure to disengage the parking pawl.
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Heel & Toe
Joined: May 2021
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Likes: 25
Hi Fast Dawg, I find it to be normal as well. Just use the parking brake on any incline. My driveway is on a slight incline where I wash the car and always set the brake. I even find that when I pull the car into the garage it may roll slightly back after I put it in park.
Le Mans Master
Joined: Apr 2005
Posts: 7,361
Likes: 4,803
From: West Burbs of Chicago IL
Yesterday I was backed into a parking spot that had a very slight incline towards the curb. I got into the car, started it, put it in Drive, and when I took my right foot off the brake it immediately rolled backwards. It felt exactly like I had a manual transmission and had let off the brake with the clutch engaged. I let my foot off the brake again and the rear tires rolled into the curb which stopped the car. I know the car has hill start assist on it but this incline wasn't nearly steep enough to engage it, and if it engaged the car should have never rolled back. The hill rollback control did not engage either.
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
I got no codes or warnings on my dash and the car drove just fine on the way home - even when I used the paddles to shift the gears on the curvy road going to my house. Has anyone else experienced this?
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
My theory is that the e-brake is easy to get to, and only have to remove the rear wheels to access for service/repair. The parking pawl inside the DCT...NOT SO MUCH!
The parking pawl seems really sloppy too, and I believe that TICK sound is the PAWL stopping the car from rolling. With that much play in there, I hope to never need or use it. That said, the button on the dash for the parking brake is a little bit of a PITA to press sometimes.
Safety Car
Joined: Jul 2013
Posts: 4,408
Likes: 3,485
From: Granada Hills CA
My technique is slightly different and saves a step. When parking, I set the parking brake, let off the brake pedal and then hit the stop/start button which automatically puts the DCT into Park.
Thread Starter
Le Mans Master
Joined: Sep 2017
Posts: 5,767
Likes: 2,968
From: Rural NW Georgia. GO DAWGS!
2024 C8 of the Year Finalist - Unmodified
By the way, I always set my parking brake when I park any of my vehicles. After working for UPS for 35+ years that is a habit that I'll never break - no pun intended.
Race Director
Joined: Aug 2019
Posts: 12,351
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From: Central Illinois
I didn't convey my own steps correctly if I'm on a slope. If on a slope and stopped, I stop the car with the regular brakes, select neutral, set the parking brake, let off the brake pedal and allow the parking brake to hold the weight of the car, then push park. Sounds like a lot but takes all of a few seconds in reality. Like dohabandit I too set my parking brake every time I park the car, flat ground or not.
Thread Starter
Le Mans Master
Joined: Sep 2017
Posts: 5,767
Likes: 2,968
From: Rural NW Georgia. GO DAWGS!
2024 C8 of the Year Finalist - Unmodified
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,185
From: Central Illinois
No I haven't, I haven't had mine back to the dealer since delivery. But I'm sure what you're saying is accurate, just cattle through the gate to them.
Thread Starter
Le Mans Master
Joined: Sep 2017
Posts: 5,767
Likes: 2,968
From: Rural NW Georgia. GO DAWGS!
2024 C8 of the Year Finalist - Unmodified
It's a habit of mine and I've noticed it at dealers here and in the places I've lived in the Midwest. I used to qualify delivery drivers at UPS before they could step foot into new driver orientation and setting/not setting the parking brake was a red flag disqualifier. We didn't want those brown trucks rolling down hills into something while the driver was out of it delivering a package.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,185
From: Central Illinois
One thing I found odd was Chevy has a video about how to store your C8 and if it's stored for months at a time, they said DON'T set the parking brake. Now most garage floors are level enough that in no way shape or form would the car be hurting the parking pawl, but that seemed a bit odd to not set the brake.
Le Mans Master
Joined: Apr 2005
Posts: 7,361
Likes: 4,803
From: West Burbs of Chicago IL
One thing I found odd was Chevy has a video about how to store your C8 and if it's stored for months at a time, they said DON'T set the parking brake. Now most garage floors are level enough that in no way shape or form would the car be hurting the parking pawl, but that seemed a bit odd to not set the brake.
Actually, I used the blocks so I don't wake up in the middle of the night questioning the decision to NOT using the parking break and have to visually inspect that the car has not rolled (even if its 3am). Thankfully I have a Nest Camera in my garage so I just look on my iPad. Yes I have OCD, lol.
