One problem related to wiring has been reported for the 2020 Porsche Cayenne. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 Porsche Cayenne based on all problems reported for the 2020 Cayenne.
The car came with a factory installed tow system. I returned it to the dealer three times and it does not work properly. I was shocked plugging in a tester to the 7 way connector. The dealer service manager advised me that I was not shocked and states that the lights stating the 7 way connector is normal. This is not normal. When I connect a digital break controller or 7 pin cable with a trailer the car doesn't not communicate with the break controller. The break controller expert stated that since no diode was showing when I plug the car in that this indicates the brakes are not wired correctly. The dealership says since another car works the same as mine they don't think it is a issue. Corporate Porsche is unable to advise on technical service bulletins or information on a wiring harness to enable a wired break controller. I took the car over to uhaul and did remote calls with the brake controller manufacturer. All state that it is something with the manner it is wired with a �open ground�. This is unsafe as I have no way safely brake or utilize a brake controller. Since other 2020s behave the same way this is a systemwide issue and the manufacturer is not taking action so it should be evaluated by engineering.