I swapped my G37 with a Q60 red sport motor, I’ve gone over everything possible on the car plus swapped ECU & BCM & I’m still getting a “Key System Error” with zero turnover whatsoever. Any suggestions on this?

 

Dude (or Dudette based on your username). You are a pioneer! I am not aware of anyone that has done this swap. Do you have any pics to share?

 

I suggest reaching out to Eugene Tarkov at Enthusiast Auto Care (https://vq37tt.com/). He is very knowledgeable when it comes to ECU issues and VIN key coding. If he can't help, he should be able to point you in the right direction.