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2014 Silverado Not Upshifting

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Post Sun Oct 19, 2014 9:00 pm

Posts: 3
I have a 2014 Chevy Silverado LTZ with the 5.3. I recently updated my Intune tuner and programmed my truck to Diablo tune with hard shift, trying to get close to my 2010 with a MaxEnergy. I installed this tune and my truck would not shift from 3rd to 4th until 35mph and 4th to 5th until 45mph. I uninstalled the firm shift, tried shift rpms lower and higher, and tried to adjust the shift pressure... nothing helped. I have now uninstalled everything and reinstalled the "Unchanged Diablo Tune" with AFM turned off. I am still having the same issue. If you are at 34MPH and let off the gas, the truck feels like the hill brake is on, if you hit 35MPH it shifts to 4th gear, however it will not shift to 5th until you hit 45MPH. Again, if you're in fourth at 44 mph and let off the gas it feels like a Jake Brake is on, even if I use the manual shift mode it still won't shift. Has anyone else had this issue? If so, can it be fixed?

Post Mon Oct 20, 2014 10:55 am

Posts: 56459
Location: DiabloSport World Headquarters

I have not heard of anything like this, is the tool updated/current?
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
M-F 8:00 AM to 5:00 PM EST

Post Tue Oct 21, 2014 8:26 pm

Posts: 3
Yes. I updated it about two weeks ago and installed this tune. Should I try updating again? After updating should I completely uninstall the tune back to factory and then re-install? Or???

Post Wed Oct 22, 2014 8:29 am

Posts: 337
Will you please post everything from the tunes folder on your Intune? I'll have a look at it.

Post Sat Oct 25, 2014 12:41 pm

Posts: 3
Here is everything in the tunes folder.
(53.21 KiB) Downloaded 131 times
(52.87 KiB) Downloaded 125 times
(111.52 KiB) Downloaded 122 times
(110.92 KiB) Downloaded 131 times

Post Wed Apr 01, 2020 8:52 pm

Posts: 1
Having the exact same problem. Same truck 2014 5.3 ltz. Did you find a fix?

Post Fri Aug 28, 2020 10:56 pm

Posts: 1
how do u change the rev limiter. 2014 chevy silverado 5.3.

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