2021 Kia Forte Transmission Problems

While driving on the highway during winter weather, your transmission started slipping or missing gears around 2nd or 3rd gear, making it difficult to accelerate and maintain consistent speeds. You drove about 60 miles to a Kia dealership where technicians confirmed you need a new transmission, even though no diagnostic codes were initially found—warning lights only appeared near the end of your drive. The transmission replacement will involve removing and reinstalling a new or rebuilt transmission unit.

While driving on the highway, your transmission started causing the car to jerk and rev unpredictably, with the engine slowing down and speeding up on its own. The vehicle is currently at a service center for diagnosis. This could indicate a transmission fluid issue, sensor problem, or internal transmission damage that needs professional inspection and repair.

Your car's transmission is shifting erratically when you drive on a specific patch of highway, causing the car to feel like it's pulling backward and losing acceleration. After you exit the highway, the car continues to downshift excessively, nearly coming to a complete stop without you braking. The dealership confirmed this is a computer issue (not a transmission failure) and that resetting the computer temporarily fixes it, but the problem returns when you drive on the highway again. The fix will likely involve the dealership diagnosing and reprogramming the transmission control computer or identifying a sensor issue causing the erratic shift commands.

It seems the car may have a defect in the transmission(Dual Clutch). The car makes at times an abrupt stop, for like a second or two, after I press on the gas. When I'm driving, especially at low speeds I can hear the transmission's parts make a grinding sounds, loud clicks. When I'm breaking, it's not smooth at all; I feel the car pulling a bit when switching to lower gears during the breaking process. When I have the car on and not moving (i.e parked), I can hear sounds emanating from the bottom of the car, like parts grinding against other parts. I have not seen any indicator light turn on from the vehicle, to this day. I have taken it to the dealership before, more than once, but they haven't found any issues with it. Still I feel they have not done a full inspection of the car, and I feel something is off with the transmission, like there's something loose somewhere in the car.

The contact owns a 2021 Kia Forte. The contact stated while driving 70 MPH, the vehicle started to decelerate while the RPM increased. The contact pulled over to the side and notice the vehicle smoking but there was no fire. There were no warning lights illuminated. The contact towed the vehicle to a local dealer, where it was diagnosed and determined that the transmission needed to be replaced. The vehicle was repaired however, the failure persisted. The manufacturer was informed of the failure. The failure mileage was 35,642.

Vehicle has issues where transmission actuator will stop functioning causing sudden loss of acceleration. Was doing 70 MPH in expressway and vehicle stopped accelerating. Issue has occurred two times, both times being serviced by Dealership, after receiving the vehicle back, issue still persists, vehicle lost acceleration suddenly when turning into a intersection.

Car stalled and shut off while in drive leading it to be towed.