When the engine is running, the battery lights up in the display

Hello municipality, My neighbor drives a Jaguar XF Bj 2009 2,7 Diesel. The first problem that occurred with him, the rotary button for read out but did not turn. Always only stand on P. brake light switch changed, errors deleted and everything was ok again. Now the error occurred again, with Gutmann read out, error: gear selector sensor. Error deleted and he ran again and again for several days. Now the error comes again and again, however, he stands always as sporadic inside e. You delete the and the rotary knob cannot be placed on D. Stays rigidly on P. Now I noticed that when the engine is running, the battery light always lights up in the display and the info, ignition is on, although the engine is running. Directly on the Lima the current measured, 11,2V. So new Lima pure and the problem still exists. The switch button cannot be turned, the Lima still produces a little over 11 volts, the battery still lights up in the display on The Battery is new and has been coded/fished via the tester Can someone help me where I can attack there or is this a problem that may be known Thank you in advance