One problem related to engine shut off without warning has been reported for the 2003 Jaguar Vanden Plas. The most recently reported issues are listed below.
Urgent. . . . . . . Traveling @ 65 mph in the hov lane of the 405 freeway the mil ( malfunction indicator lamp ) showed a trans fault, and the engine was shut down!!! I turned on the emergency flashers, and coasteed to a stop. There was not a chain reaction event. After stooping I removed the key, as a possible ignition switch over heat issue , it was not hot. I replaced the key and turned the ignition on , and the engine started, I placed it in gear, and the vehicle moved forward in limp home mode. I am familiar with obd 2, and know that no system should ever shut the engine down at highway speeds. A subsequent review on google showed numerious complaints concerning the same problem, vehicle engine shut down at highway speeds ! what do I want. I want the NHTSA to open an investigation as to what is the fix for what appears to be a programming design flaw of the ecm or tcm. I know the fix for the trans fault mil light, a loose snap ring on the front clutch drum of the zf-24 5 speed trans. That problem will be fixed, however, no driver should ever experience an engine shut down, when a fault code is displayed. If a fix is not published, people will die, if they haven't already!!!.