e39ng

"2013 GS 350
Customer Satisfaction Campaign (CSC) - CLA Certain 2013 Model Year GS 350 Vehicles Engine Control Module (ECM) Reflash
Your Lexus dealership will be contacting you shortly regarding this Customer Satisfaction Campaign. Thank you for your patience."

i just check Lexus Drivers and this is posted on my account. Anyone knows more about this?

flipside909

This usually means early build GS don't have all the updated parameters for the ECM. Since Lexus is constantly doing R&D on these cars, even after the first production models are made. It's nothing to be alarmed about.

itruns

Slight change to the shift point between gears 2 & 3 in eco mode.... As I haven't ever tried eco mode I haven't noticed anything, but Lexus is always polishing...