The rotary volume control knob on the center console of my 2024 Porsche Cayenne Coupe detached during normal, routine interior cleaning while the vehicle was stationary. The knob lifted off the control shaft with minimal contact from a standard handheld vacuum nozzle. This indicates that the retention mechanism of the control knob is insufficient and may represent a manufacturing or design defect. A loose or detachable interior control is a safety concern because it distracts the driver from the road when attempting to adjust audio, alerts, or climate menu functions. The control knob is part of an interface that the driver must use while driving, and if it unexpectedly detaches or becomes loose, it can impair the ability to safely manage vehicle settings. The issue was reported to the Porsche dealership and Porsche Cars North America. Both declined warranty coverage and classified the problem as “customer damage,” despite the failure occurring under normal usage conditions and without misuse. A properly secured interior control knob should not detach during light interior cleaning, and this may indicate a broader quality-control issue affecting similar vehicles. There were no warning lights prior to the failure. The problem is reproducible because the knob no longer attaches securely to the shaft. I am reporting this to NHTSA because an interior control that detaches under normal use may distract drivers, impair safe operation of infotainment and climate systems, and may indicate a defect in the design or construction of the control assembly.

As I was making a turn onto another avenue, and accelerating to blend into traffic flow, dashboard messages suddenly appeared 1)"Engine control error, driving still possible, see dealer." 2)"Active lane keeping not available, driving still possible, service required" 3)"Adaptive Cruise Control not available, driving still possible, service required". Adaptive cruise was not engaged at the time of the error. The car lost almost all power, despite saying "driving still possible"; cars behind me had to brake hard as my car would only go about 7-10mph tops with accelerator firmly depressed and engine began to run very roughly. I coasted to shoulder of road, took video of error messages, turned car off and restarted car which cleared messages and car regained normal operation. I was glad this happened in-town and not when merging on a highway. This is not the first time the car has issued sudden warning messages stating certain systems had failed only to be cleared by restarting the car. I have taken the car to the dealer before to have them research the issue but they say errors cannot be replicated. However, this was the first time Engine control message posted and was the first time the car lost power and put me in danger of not being able to control the car's speed in traffic. I have lost faith in the car's control systems. I can live with lack of cruise control or lane keeping, but I cannot tolerate sudden lack of power than can cause an accident. This is my 3rd Cayenne, and unfortunately on this model, the electronics are ruining an otherwise well designed vehicle.