I installed a Race Chip in my 2018 4s last week and while driving around town I got on the accelerator, when it suddenly felt like it stalled a little. A reverse gear not available light came on and the car wouldn’t shift into 2nd gear. I hit the paddle and to tried up shift to second, since I was driving in non manual mode, but it wouldn’t shift into second. When I hit the paddle it shifted straight into 3rd, I pulled into my driveway shut the car off then started it again, everything was back to normal.

So today I took the car out again and was driving normal on the freeway for the first half of my errand. On the way home I gunned it to get around a car and same thing happened. The reverse not available light came on again as soon as I punched it. So now with more time to drive it with the reverse not available light on, I noticed car would not shift into any of the even gears. It would only go into 1,3,5 and 7th, even in manual mode. I got home turned the car off and started it again, everything went back to normal.

I am not sure if this has anything to do with the Race Chip I installed. I haven’t had the chance to put the bypass plug in and try it yet. Wondering if anyone has had this same problem and if it has to do with Race Chip.