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

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (13)Electrical system (3)Engine (3)Airbags (2)Fuel system (2)Driver assistance (1)Lights (1)Tires (1)Transmission & drivetrain (1)Visibility & wipers (1)

1 of 13 complaints match · Driver assistance · clear filters

May 9, 2021Driver assistance

2018 PORSCHE CAYENNE: AT HIGHWAY SPEEDS, RANDOMLY A SERIOUS UNSAFE TO OPERATE 'SERVICE NECESSARY' WARNING APPEARS ON THE INSTRUMENT PANEL AND THE CRUISE CONTROL MALFUNCTIONS. WITH THE SERVICE NECESSARY WARNING INDICATED, THE VEHICLE IS UNSAFE TO OPERATE. THIS UNSAFE VEHICLE IS NOT DRIVABLE WITH CRUISE CONTROL FOR APPROXIMATELY THE NEXT HOUR. THIS BREAKDOWN IS KNOWN TO PORSCHE (VIA THEIR COMMUNICATIONS WITH ME) AND THEY ARE UNABLE TO RECTIFY THE ERROR. IN A 2020 PORSCHE CAYENNE THIS FAILURE HAS BEEN RECTIFIED. ATTACHED, INVOICES FROM FIVE VISITS TO PORSCHE DEALERSHIPS, ALL DURING THE WARRANTY PERIOD. ATTACHED ALSO PHOTOGRAPHS TAKEN ON VARIOUS DAYS, TIMES AND SPEEDS, AND TRAFFIC CONDITIONS OF THE SERVICE NECESSARY WARNING ON INSTRUMENT PANEL AND CRUISE CONTROL MALFUNCTIONS.

NHTSA ODI 11415736

Working with the data? Download all 13 complaints as CSV · fetched from NHTSA July 14, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2018 Porsche Cayenne Coupe Platinum Edition verdict →