we were hoping you could tell us if the problem began shortly after the fluid change.

also, did you do the fluid change yourself?
if not, who did it and how did they do it?

or just have TechStream.

if you plug an OBDII Device into your car, you may have the VSC light on all the time...I know this is true for the 2002-2005.

Steve at luxury motor cars the luxlink guy mentioned to me that if you run the WS-6 trans 90 thousand miles without a fluid change the solenoids will stick. CEL light will come on. He stated a trans back flush will free up the sticking solenoids.

he is in Monrovia, ca.

He reccomends dropping the trans pan and therefore changing the fluid like the early models required.

i had him change my trans fluid at 20k? Miles when he was installing my gen three lux link.

according to him the non service in the manual is incorrect. The CEL light is the proof it seems

how many miles do you have on your car?
how many quarts did he replace?

as Caflashbob said, not changing the fluid can cause problems. I completely agree.

if you car has high miles and has only had the fluid drained and refilled...about 3-4qts, that is not enough.
have it done again...the best way in my opinion is to remove the transmission cooler line from the radiator and let the car pump the fluid out, refill and repeat this process until the fluid comes out bright red.

it will most likely correct any issues with the transmission. If the problems persist, then you may need an overhaul.
in that case, I would look at a salvage yard vs rebuild due to cost.

i know your transmission has a different drain refill procedure vs the 2002-2005, but the concept is still the same.
i did a family members 2010 Camry transmission the way I described and all is good...I did it 15k miles ago.
NOTE: I used Valvoline MaxLife ATF, $18 gal at Walmart. It meets or exceeds Toyota WS.

Here is an AWESOME writeup from Daryl, aka DshngDaryl.
do this first to see if it corrects your problem.
https://www.clublexus.com/forums/sc4...rain-plug.html