What 13 owners told NHTSA about the 2018 Porsche Cayenne Coupe Platinum Edition

The high-voltage battery pack in my 2018 Porsche Cayenne S E-Hybrid (VIN: [XXX] , approximately 81,000 miles) has experienced a noticeable and progressive reduction in battery range and performance. On February 20, 2026, Porsche White Plains (an authorized Porsche dealer) performed an inspection but was unable to duplicate an active fault code and declined to generate a battery State of Health (SoH%) report. No warranty repair was authorized. Porsche Cars North America (PCNA), Case #XXX, has since moved to close my statutory warranty claim, citing the absence of a duplicated fault. However, under New York State's adopted CARB emission warranty standards (6 NYCRR § 218-9.1), high-voltage propulsion batteries in TZEV/PZEV vehicles are warranted for 10 years or 150,000 miles from the date of original sale. My vehicle was placed in service in 2018 and remains within that statutory coverage window through 2028. PCNA has not addressed this statutory obligation or provided written confirmation of coverage. I also have not received the inspection documentation I formally requested on March 17, 2026, despite no case closure having occurred at the time of that request. As of the date of this filing, PCNA has not responded to my follow-up correspondence. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11735314

While the vehicle was charging, the protective sheath near the power outlet of the charging cable had possible electrical or fire damage. No warning lights were illuminated. Upon turning off the power and unplugging the outlet, it was determined that the plastic near the plug melted and caused the power to short. I have been unsuccessful getting the manufacturer to resolve the issue. A recall under APB6 was issued but did not include model year 2018 which uses the same cable that is impacted with the recall.

NHTSA ODI 11593998

The day we took our Porsche home, we noticed a lot of heat generation in the car- but we thought it will be fine going further, given the attention to detail of Porsche's Automobile Engineering. The following days were not any better for my daughter- she missed a major accident because of the unexpected burnt smell and loud warnings of an overheat of the engine by Porsche in the middle of a highway. Due to her excellent driving record for the past 5 years, she was able to manage and stop in the middle of the highway at the curb of the road. She panicked so much so that, she stopped using the Porsche and borrowed our other cars, Benz and Lexus. I requested her to give Porsche another chance yesterday night. The same situation repeated again within a span of 10 minutes of her journey in Porsche; she had to stop in the middle of the road again due to engine overheat and burning smell and I went to pick her up as she got really scared. My son immediately informed the Hennessey Porsche North Atlanta, Georgia, the USA about this repeated situation but seems like they do not care at all. I think you must be aware that Dealerships play the most crucial role between your loyal customers and Porsche. We have not dared to take the Porsche out again after yesterday. The car smelled so burnt, the whole garage smelled bad and we had to move the car into the open driveway. THE CONSUMER STATED THE DEALER AND MANUFACTURER WERE MADE AWARE OF THE FAILURE. THE DEALER ATTEMPTED TO REPAIR THE VEHICLE, BUT THE FAILURE PERSISTED. THE MANUFACTURER OFFERED $1000.00 IN COMPENSATION. THE CONSUMER REQUESTED TO BE REFUNDED TOTALLY FOR THE VEHICLE.

NHTSA ODI 11429183