Submitted by foster.steve on 07. April 2019
I have had my Model S since August 2017, and love it. I use Traffic Aware Cruise Control all the time when on a freeway and have been very impressed with how smooth it operates when approaching a slower car. I have driven the car many times up, and down, California on Highway 5, and local freeways, and never had an issue. Around March 28th I up dated the software to Version: 2019.8.3. On the 30th I headed north from Southern California to Northern California. Immediately when I engaged Traffic Aware Cruise Control, I noticed that it was behaving differently. It started getting jerky. Slowing unexpectedly and speeding up. I noticed that it was behaving this when passing slower cars in the lane on the right. The cars on the right were fully in their lane, and not drifting my direction. It seemed to be getting worse as I drove. Ultimately, when passing a car in the next lane, the brakes engaged very hard. We were happy that we had our seat belts buckled. Has anyone else experienced this issue? I have an upcoming service appointment this week, and if there is any more information, I can provide the service consultant, it would be helpful. I doubt that it has anything to do with the software update. I suspect, it’s more likely something out of align, or a malfunctioning bumper sensor.