Wiring Problems of Porsche 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.

See all problems of the 2020 Porsche Cayenne 🔎.

During normal commute to work driving, a message "check dim beam" appeared on the dashboard message board. Upon attempting to change a faulty dim beam headlamp bulb, I found headlamp harness wiring and all internal headlamp assembly wiring is cracked and crumbling and conductors are exposed and causing shorts and apparent lamp failure. Other headlamp lighting (side directional lamp) lighting flashed on and off when harness was touched, and other components of electrical system flashed and turned off and on by themselves, particularly the radio. When the suspect dim beam lamp was swapped with opposite (passenger side, the replacement lamp did not work but the suspect lamp from driver side worked on the passenger side leading me to believe the lamp assembly was suspect. Upon opening the access points on the drivers side assembly, the wiring was seen to be crumbling and unsafe. I am worried that a fire may start and have discontinued use of the vehicle at this time.

See all problems of the 2009 Porsche Cayenne 🔎.

The rear brake lights (left, right and high mounted) remain lit at all times, as does the rear right and left fog lights. Turning lights on or off has no effect. Depressing the brake pedal has no effect. This problem has occurred randomly and inconsistently and when the car has been unoccupied and unattended as well as while driving. While unattended, the lights coming on drains the battery and can strand the driver. If problem occurs and the battery is not drained, the driver may be wholly unaware of the problem and may drive with the brake and rear fog lights lit. This problem also creates a major safety hazard as the brake light remain on at all times. Following drivers have no way of knowing that the driver may be braking and could result in a serious and potentially fatal rear end collision. The driver of the Cayenne, is not aware of the problem. No warning lights are illuminated to make the driver aware. If problem is noticed, removing the fuses for the fog lights and the brake lights corrects the issue, but must be reinserted, allowing for the problem to reoccur. Vehicle build date was 12/03 and outside of the Porsche wiring harness recall, but this may be the result of a faulty wiring harness feeding the rear of the vehicle.

See all problems of the 2004 Porsche Cayenne 🔎.

The contact owns a 2006 Porsche Cayenne. The engine light illuminated while driving. The vehicle was taken to the dealer who discovered that one of the wires in the storage compartment was ripped. The contact was charged $770 for wires that he stated were bare wires on one side of the non-insulated storage compartment. The purchase date and powertrain were unknown. The current and failure mileages were 48,388. The ground wire to the shut off valve had shorted out. Updated 08/15/07.

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Breach of warranty claims, including but not limited to ignition failure, wiring harness problems, airbag illumination warnings, lock failure, window failure, all within the first 10 months. The vehicle does not go more than 2 or 3 months and 3,000 to 4,000 miles without having these problems come back despite numerous attempts to repair the car. Twice the car would not shut off and a third time the key became locked in the ignition and the ignition would not turn, start, etc. The locks also failed and could not put the car in gear to tow. Became stuck on the road. Manufacturer & dealer can't guarantee the reliability of vehicle but refuses to do anything but continue to temporarily repair car. The car has been in service over 30 days within 10 month period (and counting).

This vehicle is a Porsche Cayenne which is not on your list of vehicle make. This vehicle was delivered with defective brakes and wiring problems. Factory authorized dealer and service CO, thoroughbred motorcars, and distributor, Porsche cars of north America have failed to address or correct defects in vehicle that existed at the time of delivery of the vehicle. The rear hatch did not open fully upon release of the latch, brakes pulled to the right and would get worse when hot or wet, parking lights did not function properly, brakes grabbed with little pressure, warning on high beam, warning on dip beam, dip beams flickered then would shut off and the trailer lights did not function.