2013 xf 2.0. Some days the car will run fine, others it will flash all the warning lights a low battery will indicate. Battery is new and stays on a manager at night.
A quick strike to the top of the dash will rectify all of the warning lights, but after removing the whole dash I couldn't find any loose or exposed wiring. The Traction Control light on the Gear Selector also does this when it's acting up and sometimes the tach will spike.. https://youtu.be/vBJrI5v4mH8
https://youtu.be/-WtWRe_etk8

 

My 2013 (UK) Jaguar has a similar problem. After start up I travel a mile or two then the car goes mad, every fault code appears, the steering goes heavy, the rev and speedo counters go up and down, the temp reading goes negative, the eco start doesn't work, sometimes the engine cooler comes on and the voltage plummets to about 11v (according to my scan tool). Then, once the car has done about 5 miles I shut it off and restart, solving all the issues and the voltage goes to about 14.6v. Did you resolve your issue? I think that mine could be due to a faulty cjb, although there is no water ingress.

 

PS I fitted a new battery but no change. My car is the 3.0D model.

 

You can check the CJB for water by removing the multiplug (top for saloon & next down for sportsbrake).
No need to disconnect the battery.

 

I had to replace the ICP. It was a nightmare, dealer only adventure. I only found out the cause when I became upset and smashed my fist on the dash and the car came back to life.