2023 Lexus Nx

My concern is regarding the auto start-stop feature. It is a concern since the feature is tied to both the brakes and engine, and it could lead to other/bigger issues. When stepping on the brakes to come to a stop, sometimes the auto start-stop feature turns on. Upon releasing the brakes, there is a loud grinding noise. I brought it to the dealer twice for this issue. The first time a master technician got in the car with me, he drove it and he was able to reproduce the sound continuously, at least 10 times. I left my car with them for a week and was told they were never able to reproduce the noise again. I brought my car home and drove it for 5 days and then it started making the noise again. I took it back to the dealership and they kept it for another 5 days. I was told again they were not able to reproduce the noise. There have been no warning lamps, messages or other symptoms of the problem. As background, I purchased my car in April of 2023. The noise started in January of 2024, with less than 6800 miles on it. It happened off and on and it took a few weeks for me to realize the noise was tied to the start-stop feature. Once it became more prevalent, that is when I finally called the dealership to explain the issue and got an appointment to take my car in on 2/19/2024. I currently don't have videos to attach but can follow up with videos in the future if needed.

The contact owns a 2023 Lexus NX350. The contact stated that while driving at an undisclosed speed with the Adaptive Cruise Control feature activated, the vehicle came to an abrupt stop while driving by a road with vehicles parked next to the curb. The contact stated that there were no vehicles in front of the vehicle. The contact stated that the Forward Collision Avoidance message was illuminated when the vehicle came to a complete stop. The vehicle was taken to a local dealer. The vehicle was not diagnosed nor repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 8,000.

Vehicle is built so that water from hand-washing/rinsing gets under the hood and into a computer causing electrical issues and causing the car to not start. The dealership put a foam/rubber trim around the hood to prevent water from getting in but this won't last forever and, when they tested the other cars of the same model on the lot, they confirmed it happened with those cars also. The manufacturer's statement was that the owner's manual says you are not supposed to hand wash it. This is ridiculous. The owner's manual says you can't pressure wash the engine compartment - which noone did. This was caused during a routine wash at the car wash. It is unlikely anyone would buy a car if they were told they couldn't take it to a car wash. But the concern is that it happened twice and the fix will be temporary. Both times this occurred, the car was parked. The first time, there were electrical issues. The second time, the car refused to start after it was shut off.

Vehicle was remote started using Lexus app. Wife entered vehicle using rear door along with infant daughter. She sat in the back seat to feed her a bottle. When ready to leave, she placed and secured our daughter in her car seat. She then opened the rear passenger door to get into front driver seat to begin driving. On opening the door, the car alarm went off. She exited the vehicle through the rear passenger door. She shut the door and as she as waking to the driver door, the vehicle locked itself with the keys, phone and our daughter inside the car. The alarm startled her and she left the keys in the rear seat. The vehicle remained on. When remote started via the app, the car remains on for 10 mins. She got help and dialed 911.. vehicle shut off 3-4 mins prior to fire department arriving. They tired to open the door but were not successful. Ended up breaking the window to remove our daughter. Thankfully she was ok. I am unsure how the car locked itself with the keys still inside. The keys were in the rear seat by the child car seat. Took vehicle to Lexus dealer. They stated there were no faults with vehicle. Referenced page 63 of owners manual which states car may not detect keys if left on top of console or door pockets… which was not the case here. Have not attempted to re produce issue. Very concerned this may happen the someone else. There were no warning lamps on.