2022 KIA EV6 Forward Collision Avoidance Adaptive Cruise Control Problems

My 2022 Kia EV6 developed a serious electrical/MCU malfunction on 10/19/2025 at approximately 64,300 miles. While driving, the vehicle began to stutter during acceleration, all driver-assistance and safety systems disabled (LKAS, collision avoidance, lane keeping), and the vehicle could not accelerate normally (topping out around ~60 mph when fully pressing the pedal). The Kia Connect app displayed fault codes MCU P0A4100 and LKAS C164286. The malfunction recurred immediately after a dealer visit on 10/20/2025. The vehicle has since been inspected by Huffines Kia in Corinth, Texas, but no confirmed diagnosis has been provided, nor have they notified me of dropping/reconnecting the HV battery. On 11/18/2025, a new fault code appeared: MCU P0C1700. This failure affects the high-voltage electronics/MCU and causes sudden loss of acceleration capability and complete disabling of active safety systems while the vehicle is in motion, placing me and other drivers at risk. The issue is reproducible, continues...

When car is on HDA mode. Drive assist. And speed under 20 miles on Highway. Car make sudden stops and it is also called ghost stop. Very dangerous and will likely to cause rear end collision.

This vehicle is equipped with Semi Autonomous Driving. While using Semi Autonomous Driving with Navigation and all other Safety Items active, the vehicle swerved out of its lane and side swiped a Semi before driver could react and move vehicle back into lane. Multiple items failed. Semi Autonomous Driving - Lane Assist - Lane Keep - Emergency Breaking - Blind Spot Warning. No warning lights / sounds activated. (We have a video of this happening a 2nd time but we avoided the accident). Damages to car is roughly $14k and luckily it was not worse as loss of life could have happened. KIA has been notified and the claim is 14832390. Current status is they want the dealership to review the vehicle once the Body Work has been fixed. KIA wants to see if they can recreate the incident. Vehicle is still being fixed and expected to be available to...