I have a 2003 Jaguar X-type and the engine warning light illuminates and the message "cruise control is not available" appears. Just prior to this occurring the first time, the car was going about 50mph and shuddered very slightly. The car is running OK now but these lights continue to illuminate most of the time I am driving. I would like to know what this could be and whether it could be dealt with by an ordinary garage mechanic rather than a specialist Jaguar engineer.