Was driving vehicle downhill on a small hill in Palm Springs when multiple error messages appeared in rapid succession on the information display, including 'traction battery fault - safe to drive with caution'. This was immediately followed by "pull over and stop the car" but before I had the chance to do so ALL the systems in the car ceased to operate and all electrical systems shut down. The breaks would not work, the steering would not work. I was still traveling down hill and unable to stop the car. The car continued for approximately 1/2 a mile and went through two stop signs. Fortunately it was early morning and there were no other vehicles, or pedestrians around, if there had been I would have been unable to avoid hitting them. My safety and that of any other driver or pedestrian who could have been on the road was seriously compromised. The car finally came to rest towards the bottom of the hill and I was able to exit the vehicle. Had this happened if I was traveling at speed on a freeway, I hate to contemplate the consequences. This same problem happened about 4 weeks ago, but fortunately the total shut down occurred while the car was stationery in my garage. The dealership towed the truck then and returned it to me a few days later, saying they had resolved all the issues - but clearly not. I have no confidence in the safety of this car. The dealer is collecting the car today to return it to the Jaguar dealership in Rancho Mirage.

- Palm Springs, CA, USA