2021 Kia Sorento: start-stop system problems

Filed Aug 10, 2026 · Acceleration, Transmission · DE

My car will randomly go into limp mode and I am unable to accelerate. The auto stop/start light will flash orange on the dashboard. I need to pull over and restart car and it seems to reset. I see there is a recall for a 2021 KIA Sorrento but I don't think it affected my vehicle even though the issue is exactly the same. Recall #22V6000. It happened once a few months ago then didn't reoccur until about two weeks ago and it has happened three times since. It is scary because I am afraid to cross traffic in fear that the car won't move fast enough

Filed Nov 5, 2025 · Electrical · 108,000 miles · TX

The contact owns a 2021 Kia Sorento. The contact stated that while the vehicle was parked or while driving, there was an abnormal sound coming from the A/C when activated or turned off. The contact stated that after lowering the temperature, the air conditioning shut off independently. The contact stated that the alarm independently turned on at all hours of the night. The contact stated that the rear plug outlets in the vehicle failed to operate as intended, and the rear plugs turned on and off independently. The contact stated that while driving at undisclosed speeds, the Auto START/STOP system independently turned off the vehicle. Additionally, the rear-view camera was displaying a blank screen, with the Auto START/STOP warning lights were illuminated. A dealer was contacted. The vehicle was taken to a dealer to be diagnosed; however, the diagnosis was unknown. The vehicle was not repaired. The contact stated that the failure had occurred on several occasions. The manufacturer was notified of the failure and informed the contact that the dealer was unable to determine the cause of the failure, so there would be no assistance provided. The failure mileage was approximately 108,000.

Filed Jul 13, 2025 · Engine, Fuel system · GU

I have had many issues where my car will completely shut off after the auto start-stop function causing me to almost get into accidents with my toddlers in the vehicle. There was one incident where I was at a stop light, when the light turned green I started my car again to go and another vehicle continued to bypass me. When i halted for the other vehicle, my engine shut off again almost the cause of a horrific accident. I have had many incidents after this with the related cause of engine shutting off.

Filed May 20, 2025 · Driver assistance, Electrical · LA

My electrical system failed. While on park I was unable to shut of the vehicle using the engine start stop button. After waiting for the vehicle to automatically turn off. The vehicle started trying to restart itself. The negative battery post had to be removed for the vehicle to stop. The entire safety system failed and all warning lights are still displayed on the dash. The backup camera and radio display went completely blank and was unavailable.

Filed Mar 25, 2025 · Engine · GA

On three separate occasions, after starting the vehicle, the car cannot be accelerated above 30 mph. The Idle Stop and Go (ISG or Auto Start Stop feature) light flashes orange, but no other warning symbols are illuminated. After safely moving the vehicle off the road, I have to turn off the engine, wait for 2-4 seconds, and restart the engine. Once the vehicle is restarted, the vehicle accelerates normally. This issue has happened twice in the past month. I plan to take my car to a Kia dealership for an inspection, but since this problem happens randomly, the Kia technicians may not be able to reproduce the problem. I purchased this vehicle used with about 77k miles in December 2023. I first noticed this issue in April 2024. The vehicle now has a little under 98k miles recorded.

Filed Sep 19, 2023 · Transmission · TX

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.

Filed Feb 21, 2023 · Electrical · 34,000 miles · CA

The contact owns a 2021 Kia Sorento. The contact stated while driving and coming to a complete stop, the auto Start/Stop feature failed to engage upon releasing the brake pedal. There was no warning light illuminated. The contact restarted the vehicle manually. The contact stated that the failure had been reoccurring while at a complete stop. The vehicle was taken to the dealer where an unknown software update was completed under an unknown recall; however, the failure reoccurred increasingly. The contact stated upon releasing the brake pedal while at a complete stop, the vehicle would turn on temporarily. The contact stated she would manually restart the vehicle. The dealer was notified of the failure and informed the contact to bring the vehicle to their location for test driving. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure referred the contact to the dealer. A case was opened. The failure mileage was approximately 34,000.