Porsche Cayenne May Suffer From 'Bad Grounding'
Owners of a 2015-2016 Porsche Cayenne may notice that a MIL is on. Often this is accompanied by other unwanted behavior.
The technician may find DTC P0C47400 is present in the high voltage battery. A bad ground has been found, in a number of cases.
The service recommendation is to check ground continuity and replace the electric water pump and the electric water pump relay, if necessary.