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Old 06-06-2013, 07:19 AM
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I Think I Fixed My Rough Shifting 8sp Transmission

Since day one I have had issues with my 8sp transmission in my 2014 V6 GC Limited 4x4 (current mileage 1100)...namely downshifts into 1st and 2nd were slow & rough, and sometimes I would even get a clunk from the drivetrain. In addition, the tranny seemed to hunt for gears at times, when I would floor the gas the transmission would hang in neutral for a few, and most the time the transmission did not seem to downshift quickly enough when taking my foot off the gas pedal.

So what I thought I'd try was "Reset" by means of a battery disconnect. I have powered seats, so...

1) I raised and moved forward the passenger seat as far as it would go.

2) I pulled off the battery cover on the floor under the seat (no tools required, simply stick your finger tips in there and pry/pull off). Only 4 tabs holds the cover on.




3) Then I disconnected the negative side of the battery, pumped the brakes to dissipate residual power in the system, and let it sit for 15 minutes.




4) Then I just reconnected the negative side, reinstalled the cover, put the passenger seat back down, and started the engine...letting it idle for about 5 minutes, then took it on a short 15 minute run around town. I DID NOT LOSE ANY UConnect settings, radio pre-sets, or any other interior settings.

All I can say is WOW...my GC is a totally different animal! It's now been two days, and the rough down shifts into 1st and 2nd are still gone, no more hunting for gears, when I floor the gas it finds a gear faster, and when I take my foot off the gas pedal, the transmission immediately starts to downshift.

I will be keeping my eye on this, and will report any new findings.
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Old 06-06-2013, 07:29 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Thanks for posting.
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Old 06-06-2013, 07:30 AM
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Great find!
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Old 06-06-2013, 07:35 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Glad to hear you've tamed the beast!
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Old 06-06-2013, 07:37 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Quote:
Originally Posted by jacko15 View Post

Glad to hear you've tamed the beast!
Me too...it's only been two days though.

Fingers crossed!
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Old 06-06-2013, 07:42 AM
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How is the rest of shifting and downshifting?
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Old 06-06-2013, 07:46 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Quote:
Originally Posted by jaxkxx View Post

How is the rest of shifting and downshifting?
Compared to what it was before...like butter.

Shifts are not abrupt anymore...much smoother & quicker.
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Old 06-06-2013, 07:48 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

If it stays this way they should be naming a Star case after you.



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Old 06-06-2013, 10:06 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

This seems just crazy but, hey, who really knows where all those little electrons go.

Lots of complaints about rough shifting, anyone else tried this? Anyone see any downside to trying it?
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Old 06-06-2013, 11:52 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

I might give this a try. My first and second gears (esp. in ECO) are rough going up and down, more so in stand-still traffic around 5-15 mph stop and go. I only have 700 miles on it so it might still be breaking in.

Anyone else try this yet?
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Old 06-06-2013, 12:59 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

I've noticed a few times rough down shifting in traffic but only in sissy save fuel mode going to go give this a try right now.
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Old 06-06-2013, 02:22 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Unhooked the battery and let it sit for 30 mins it actually does shift smoother WTH went for a short drive through San Francisco traffic and the down shifts were smooth with no noise/clunk. I'm confused as to why this worked but whatever.
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