C7 auto transmission weird issue
06-19-2017, 10:42 AM
#1
Burning Brakes
Thread Starter
C7 auto transmission weird issue
I am going to try to explain this the best I can, From a full stop the car behaves as expected. But from 45mph plus, on a regular basis , when I go to full throttle the rpms bounce up to near red-line and just hang out there like it is stuck in gear and doesn't seem to be accelerating.
I don't know how to troubleshoot this. Any ideas?
I don't know how to troubleshoot this. Any ideas?
06-19-2017, 11:09 AM
#2
Melting Slicks
Sounds like its going into performance shift mode after you went wot. Does it upshift on its own or just over rev and bounce off the rev limiter? Are you in drive or manual mode?
Last edited by BlueDevilZ51; 06-19-2017 at 11:12 AM.
06-19-2017, 01:57 PM
#3
Burning Brakes
Thread Starter
In Drive, when it seems to hang there, I let up. I haven't seen it bounce off the rev limiter. I have it set to sport mode if that matters.
06-19-2017, 02:05 PM
#4
Melting Slicks
Well if its up shifting without bounching off the limiter i dont see a problem. It will definitely hold the gears longer and stay in a more aggresive rpm range if you were just full throttle due to the computer putting the the car in performance shift mode.
it will again return to normal shifting behavior after around 10 seconds.
it will again return to normal shifting behavior after around 10 seconds.
Last edited by BlueDevilZ51; 06-19-2017 at 02:06 PM.
06-27-2017, 10:30 PM
#7
Melting Slicks
If you drive it in Economy mode or in Touring mode it won't go into performance shift mode. Performance shift mode lets you accelerate and make a corner then power out without up shifting mid corner as it would in touring mode. It is even more 'aggressive' in track mode. All normal for performance driving. Stay out of WOT and it stays out of performance shift mode.
06-27-2017, 10:39 PM
#8
The OP isn't clear about whether he is continuing at WOT and it isn't accelerating. If he is backing off the throttle I can understand it maintaining a high steady RPM due to PAS/PAL programming but if he literally meant what he wrote: "when I go to full throttle the rpms bounce up to near red-line and just hang out there like it is stuck in gear and doesn't seem to be accelerating" then that is a problem if it doesn't accelerate as it should. Either a transmission or engine issue could cause this but normally that would result in one or more DTCs being set.