Auto-Tranny shifting issue
 

Hello all, I've searched and searched the internet for a fix for my Automatic trans shift problem/slippage and Honestly im stumpt. I have no leads, no ecu codes and im just at a complete loss. The car only has 25k original miles, not boosted, and I have no clue why this issue is happening. Anyone have any clues? :iono:
EDIT: at one point i had a p0700 code but that is it.

Video is below.

What I have tried:
I replaced the torque converter completely, with a brand new OEM one and it did not fix it.
That came with a transmission oil change, and diff oil change.
We inspected all connectors and plugs and nothing looked out of order.

VIDEO: https://www.youtube.com/watch?v=zPhokIZFwf4

You looked at the wrong control module captain.

P0700 is a general transmission fault that sets in the PCM at the request of the TCM, which is where the trouble code that could have helped you was.

You get to the TCM with a better scan tool.

I got the code when I was tuning with the OFT I think thats what caused it, because since reverting back to stock tune, the check engine light disappeared.

dang what tune did you use before going back stock?

have you tried re-flashing stock tune?

I flashed the stage 2+ tune that OFT supplies, I ran it for months before this issue suddenly happened. Since it happened I flashed back to Stock, and the issue ensues.

hmmm same issue in auto mode? was the video in manual shifting mode?

I'm also AT on stage 2 but its customized.

It happens in both Manual and Drive gears.

https://www.ft86club.com/forums/show...55&postcount=2


TSB out on idle and hard shift issue on 2015 auto, Auto trans computer updated software

in that video of the issue that guy had, it just looked like rough shifting. In my situation it looks more like it goes in limp mode and revv's out before going into next gear. Do you think its the same issue?

It doesn't hurt to update the transmission software, issue seems to be the transmission valve body solenoid not engaging on command. you can probably find a whole used auto transmission to swap out or go to a transmission shop to diagnose the issue which would cost the same in parts and labor. good luck on the issue

Should I buy this part and swap it out? I already swapped out the Torque Converter cuz i that that was the problem but it wasn’t.

Finding a complete low mileage transmission to swap in would be your best option, I've seen some on ebay off 541 motorsports for around $700 shipped

:cry: so costly :(

Were you able to fix this issue?