Limp Mode After Emergency Braking
Thread Starter
8th Gear
Joined: Dec 2020
Posts: 8
Likes: 4
From: Albany, Louisiana
Limp Mode After Emergency Braking
I am trying to fine out if anyone else has experienced this or knows if this is normal. I have a 2016 C7 Corvette. Today I was on the interstate traveling 70 mph when someone in the lane to the right of me changed lanes on top of me. I jammed the brakes the ABS kicked in and I barely avoided getting hit. I then stabbed the accelerator and the car fell on it face. It was accelerating slowly. I was then in the left lane of the interstate down to about 30 mph with traffic doing 70 mph coming up behind me and the car just didn't want to go. I tried letting off and accelerating again but it did the same thing. After about 10 or 15 seconds everything came back and the car took off. Is this some sort of limp mode the car goes in after an emergency? If it is I don't like it.
Any help would be appreciated.
Thanks.
Any help would be appreciated.
Thanks.
Thread Starter
8th Gear
Joined: Dec 2020
Posts: 8
Likes: 4
From: Albany, Louisiana
Pulling over would have been a good option but I couldn't. It was in a construction zone. I had a concrete barrier on my left side and traffic in the lane to the right, so I just had to deal with it. My original thought was I tried to accelerate too fast and traction control kicked in, so on the second attempt I eased into the throttle with the same results. If this is the way the car is programmed to act it is very dangerous and I don't like it.
Race Director
Joined: Aug 2015
Posts: 12,256
Likes: 4,745
From: SE WI
Yeah doesn't sound right. At Spring Mountain owner school they had us do several emergency braking exercises. And we had to go into to full anti-lock mode, stomping on the brake with full force. Not once did anybody's car go into limp mode. They told us they wanted us to know instinctively how to stop the car in case we were to go off track. They said that In the past people would try to save it and trash the car. It's truly remarkable how these cars can continue to steer in full anti-lock brake mode at high speed. Even on wet pavement.
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
What you describe is very odd. I have invoked ABS suddenly with no ill effects.
My hypothesis is the event confused the stability control and traction control some how (wheels rotating at unexpectedly very different speeds, yaw sensor disagrees with steering angle, etc.). It may take a bit for the car to unscramble its brains under these circumstances.
If it does not happen again I would forget about it.
My hypothesis is the event confused the stability control and traction control some how (wheels rotating at unexpectedly very different speeds, yaw sensor disagrees with steering angle, etc.). It may take a bit for the car to unscramble its brains under these circumstances.
If it does not happen again I would forget about it.
Thread Starter
8th Gear
Joined: Dec 2020
Posts: 8
Likes: 4
From: Albany, Louisiana
Thanks for the replies.
I remember the braking exercises at Spring Mountain, but we did not try to accelerate hard right when we came off the brake pedal.
I am hoping to determine if this is something that can be expected to happen coming out of an emergency situation, or if it was just a fluke incident.
I remember the braking exercises at Spring Mountain, but we did not try to accelerate hard right when we came off the brake pedal.
I am hoping to determine if this is something that can be expected to happen coming out of an emergency situation, or if it was just a fluke incident.
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Thread Starter
8th Gear
Joined: Dec 2020
Posts: 8
Likes: 4
From: Albany, Louisiana
I had some time today. I tried several times to get the car to do it again, and could not. I tried emergency baking several times, and swerved during some of the attempts, and the car accelerated normally after each attempt. I am going to chalk it up as a fluke, and hope it doesn't happen again.
Thanks for everyone's input.
Thanks for everyone's input.
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
I am trying to fine out if anyone else has experienced this or knows if this is normal. I have a 2016 C7 Corvette. Today I was on the interstate traveling 70 mph when someone in the lane to the right of me changed lanes on top of me. I jammed the brakes the ABS kicked in and I barely avoided getting hit. I then stabbed the accelerator and the car fell on it face. It was accelerating slowly. I was then in the left lane of the interstate down to about 30 mph with traffic doing 70 mph coming up behind me and the car just didn't want to go. I tried letting off and accelerating again but it did the same thing. After about 10 or 15 seconds everything came back and the car took off. Is this some sort of limp mode the car goes in after an emergency? If it is I don't like it.
Any help would be appreciated.
Thanks.
Any help would be appreciated.
Thanks.
I forgot what sensor triggers this but it can happen when most of the oil pools at the back or front of the engine/tank cant remember the exact conditions but you can probably look it up on Google easily.
Did it come back on its own after a bit or did you have to restart the car to clear limp mode?
Oil starvation protection will reset itself when the condition clears, where other limp modes usually need some other intervention to be re-set.
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
I tried several times to get the car to do it again, and could not. I tried emergency baking several times, and swerved during some of the attempts, and the car accelerated normally after each attempt. I am going to chalk it up as a fluke, and hope it doesn't happen again.
I believe it was one of those rare odd things that happen only once.
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
The oem dry sump system is nowhere as robust as the ones you find on a real race engine with oil scavenging points all over the engine.
I don't remember all of the details but there is something you can do in the tune to make it more tolerant.
I would not worry about it personally, the oem dry sump helps in this area but is not immune to physics (just like stability and traction control.) and has protections in place when the electronics cannot overcome the issue.