Slight jolt during final downshift while braking normal?
07-16-18, 09:22 PM
#1
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Slight jolt during final downshift while braking normal?
so driven about 1k miles on car now and I have been noticing that as you are cruising in 8th gear and during normal braking (I know the tranny downshifts) there is a slight jolt at around 18-17 mph. Its the 5th to 3rd gear downshift. It’s not neck breaking but you do feel it and its getting annoying. Only does it after you pass 45+mph and in 8th gear. I drove the car under 40mph and it brakes and downshifts smoothly to stop. Is this normal? Before I go to the dealership and get quoted “this is normal” or “we can replicate the action”. Or can I get the transmission shift points reprogrammed. Im starting to miss my ISF. The fun factor and drive train smoothness are way better.
07-16-18, 09:50 PM
#2
Yes, I occasionally experience the same thing, but I'm not sure what gear it's in when it happens. However, I do know it's the final downshift just before stopping. It happens at about the same speed as yours. It's not my imagination!! I'm wondering if the transmission can be reprogrammed too. I have 11,900 miles.
07-18-18, 03:03 PM
#3
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so driven about 1k miles on car now and I have been noticing that as you are cruising in 8th gear and during normal braking (I know the tranny downshifts) there is a slight jolt at around 18-17 mph. Its the 5th to 3rd gear downshift. It’s not neck breaking but you do feel it and its getting annoying. Only does it after you pass 45+mph and in 8th gear. I drove the car under 40mph and it brakes and downshifts smoothly to stop. Is this normal? Before I go to the dealership and get quoted “this is normal” or “we can replicate the action”. Or can I get the transmission shift points reprogrammed. Im starting to miss my ISF. The fun factor and drive train smoothness are way better.
07-19-18, 10:31 PM
#4
so driven about 1k miles on car now and I have been noticing that as you are cruising in 8th gear and during normal braking (I know the tranny downshifts) there is a slight jolt at around 18-17 mph. Its the 5th to 3rd gear downshift. It’s not neck breaking but you do feel it and its getting annoying. Only does it after you pass 45+mph and in 8th gear. I drove the car under 40mph and it brakes and downshifts smoothly to stop. Is this normal? Before I go to the dealership and get quoted “this is normal” or “we can replicate the action”. Or can I get the transmission shift points reprogrammed. Im starting to miss my ISF. The fun factor and drive train smoothness are way better.
I certainly think the GSF is at least as fun, if not a bit more fun, than my old ISF so definitely a very subjective experience IMO.
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mr2dave (05-22-22)
09-20-18, 06:59 PM
#5
so driven about 1k miles on car now and I have been noticing that as you are cruising in 8th gear and during normal braking (I know the tranny downshifts) there is a slight jolt at around 18-17 mph. Its the 5th to 3rd gear downshift. It’s not neck breaking but you do feel it and its getting annoying. Only does it after you pass 45+mph and in 8th gear. I drove the car under 40mph and it brakes and downshifts smoothly to stop. Is this normal? Before I go to the dealership and get quoted “this is normal” or “we can replicate the action”. Or can I get the transmission shift points reprogrammed. Im starting to miss my ISF. The fun factor and drive train smoothness are way better.
Did you ever get a resolution to your slight jolt issue? I took mine in today and will pick it up tomorrow. My service advisor called this evening to say It appears to be normal (just as you anticipated). However, he did not deny that it existed. He further stated that there were no available updates or reprogramming. I'll know more tomorrow when I pick it up.
Thanks,
09-20-18, 10:34 PM
#6
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Thread Starter
Hey 916gs400,
Did you ever get a resolution to your slight jolt issue? I took mine in today and will pick it up tomorrow. My service advisor called this evening to say It appears to be normal (just as you anticipated). However, he did not deny that it existed. He further stated that there were no available updates or reprogramming. I'll know more tomorrow when I pick it up.
Thanks,
Did you ever get a resolution to your slight jolt issue? I took mine in today and will pick it up tomorrow. My service advisor called this evening to say It appears to be normal (just as you anticipated). However, he did not deny that it existed. He further stated that there were no available updates or reprogramming. I'll know more tomorrow when I pick it up.
Thanks,
05-21-22, 04:34 AM
#7
unfortunately no fix. With no warning light or broken parts, dealership is not going to rip into transmission or replace it. What I discovered is that in sports + mode, I don’t experience it, maybe it’s because it only goes to 6 gears. So I’ve been just using sports + on streets and switch to normal mode for freeway. But keep me updated if you get a solution!
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05-21-22, 04:53 PM
#8
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There is one thing to try that's not insanely expensive. Have the fluid level set to the correct amount of fluid. I've noticed all kinds of weird symptoms when the fluid level is low on both the GS F and the IS F that disappear when it is right.
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