This bulletin applies to 2014 Jaguar F-Type, 2013-2014 XF and 2013-2015 XJ vehicles. The engine speed may dip or the engine may hesitate after an Auto Stop/Start event. This may be caused by a PCM software calibration issue. 

A Jaguar land Rover-approved Midtronics battery power supply must be connected to the vehicle battery during diagnosis/module reprogramming. Ensure that all ignition ON/OFF requests is carried out. The Jaguar Land Rover-approved diagnostic tool must be loaded with DVD 146.02 v243 or later.