Temporary Limp Mode/Fuel Cut?
11-23-2020 | 10:20 AM
#1
Thread Starter
Super Member
Joined: Oct 2015
Posts: 782
Likes: 105
From: Tampa, FL
'17 AMG C63S Edition 1 Coupe, '18 AMG C63S Convertible, '19 AMG GLS63
Temporary Limp Mode/Fuel Cut?
So I've had this problem sporadically for about a year or so. I'd be driving, typically on the highway, and attempt to accelerate more aggressively by pressing on the gas, but I get no response in terms of RPM change or travel speed. So it's not like the clutch is slipping and it's overreving. To the contrary, its almost like it enters into a limp mode and simply won't let me accelerate.
It's not cutting existing power, however. So it's not like I'm losing speed; I can maintain the current travel speed and RPMs, but can't accelerate; even when going WOT at that point.
Now I initially thought that maybe this was a trans lockout/engine protection typa situation to ensure the vehicle is at optimum operating temp before allowing aggressive acceleration. But a) I live in FL, where it never really gets that cold, and b) as I mentioned, this is happening 10-15 min into the drive, after I've left the neighborhood, gotten onto surface streets, and am on the highway, and have been driving on the highway for a few min when I decided to accelerate more aggressively (eg attempting to pass a vehicle).
This time, this happened twice in the past week, so videos of it. I'm at operating temp, and I'm literally at WOT, holding the throttle like that. As long as I'm at WOT, it will remain in that limp mode. Only thing that seems to resolve it is taking my foot completely off the accelerator then depressing it again, at which point the accelerator responds.
Any ideas?
TIA!
https://www.youtube.com/watch?v=Vq3I...ature=youtu.be
https://www.youtube.com/watch?v=f2jQ...ature=youtu.be
It's not cutting existing power, however. So it's not like I'm losing speed; I can maintain the current travel speed and RPMs, but can't accelerate; even when going WOT at that point.
Now I initially thought that maybe this was a trans lockout/engine protection typa situation to ensure the vehicle is at optimum operating temp before allowing aggressive acceleration. But a) I live in FL, where it never really gets that cold, and b) as I mentioned, this is happening 10-15 min into the drive, after I've left the neighborhood, gotten onto surface streets, and am on the highway, and have been driving on the highway for a few min when I decided to accelerate more aggressively (eg attempting to pass a vehicle).
This time, this happened twice in the past week, so videos of it. I'm at operating temp, and I'm literally at WOT, holding the throttle like that. As long as I'm at WOT, it will remain in that limp mode. Only thing that seems to resolve it is taking my foot completely off the accelerator then depressing it again, at which point the accelerator responds.
Any ideas?
TIA!
https://www.youtube.com/watch?v=Vq3I...ature=youtu.be
https://www.youtube.com/watch?v=f2jQ...ature=youtu.be
11-24-2020 | 01:45 AM
#3
Thread Starter
Super Member
Joined: Oct 2015
Posts: 782
Likes: 105
From: Tampa, FL
'17 AMG C63S Edition 1 Coupe, '18 AMG C63S Convertible, '19 AMG GLS63
Hmm...now that I have it on video, I'm hoping they'll be forced to replace something in the quest to remedy the situation...
02-04-2021 | 07:35 AM
#4
Thread Starter
Super Member
Joined: Oct 2015
Posts: 782
Likes: 105
From: Tampa, FL
'17 AMG C63S Edition 1 Coupe, '18 AMG C63S Convertible, '19 AMG GLS63
In case anyone else runs into a similar problem, figured I'd provide an update. Got it on video, happening 3 different times, including when everything was at operating temp. Tech said it was a bad torque converter, and replaced it under warranty. Hope that resolves the issue.
