NHTSA Complaint #11545517 — 2021 KIA SORENTO

The automatic start/stop function (ISG) stopped functioning. The light turned from green to amber and flashes intermittently. When the light is flashing the vehicle has a loss of power. On 8/28/23 I was accelerating to get on the interstate. Suddenly the speedometer dropped from 40 mph to 24 mph. I had to quickly exit the on ramp as to avoid being hit from behind by a huge white pickup truck. I drove the side streets, staying under 40 mph, to the dealership.You cannot disable the ISG at this time. There is no warning of when this may happen. I've had it in the dealership 3 times, 8/10/23, 8/24/23, and 8/28-9/16/23. The first two times they could not replicate the problem, so nothing was done. On the third visit a high pressure sensor was ordered and replaced. The ISG is still malfunctioning. Now the ISG kicks itself back on after it has been disabled. The light is still amber, not green, indicating there is still a problem. Loss of power has happened twice 6/25/23 and 8/28/23. I have service reports and videos of flashing lights. Unfortunately, I was not able to load at this time.