If you drive it normal it shifts fine and seems to drive fine. If you accelerate hard around 50-55 MPH it acts like you hit a rev limiter. If you back off the throttle it shifts down and drives ok. I hope a Lexus Tech, has seen this before it is driving me...

FIX posted 9/14/2022

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle