I have a 2014 gsr. 6500 miles. Recently tuned by RT Tuning. I've been getting an ASC service light and sometimes the 4wd service light only under WOT at around 6k rpms in 3rd or 4th gear. Took it to the dealer and because I thought I needed the awc fluid bled because it looked low but dealership said it was fine and that it could be a g force sensor. 2 dealerships later, problem is still there. I know i am not overboosting because I logged my boost and it doesn't exceed 26psi. This just started happening recently. Car ran like a champ after the tune. Honestly started having problems when the weather got warmer. It is getting super annoying that no one can figure it out. Anyone have any advice or could point me in the right direction?

 

The simple and most obvious answer is usually right. I would suspect it has something to do with the tune and it took a few drive cycles in order to throw a code.

I would revert back to the stock tune, clear the codes and see if they show again.

 

I reverted back to the cobb ots maps and same thing. It can't be the tune