There are 3 stored owner reports matching the powertrain & transmission leading-label group for the 2015 Porsche Cayenne in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 3 of 3 matching reports.
Open the full vehicle complaint log (all categories)MY PORSCHE CAYENNE DIESEL HAS HAD THE PORSCHE DIESEL EMISSIONS SETTLEMENT PROGRAM "FIX" COMPLETED. SINCE THE "FIX" THE VEHICLE HAS BECOME DANGEROUS TO DRIVE IN CERTAIN SITUATIONS. WHEN MERGING, TURNING A SLOW SPEED CORNER OR ROLLING THROUGH A YIELD SIGN THERE IS A SIGNIFICANT LAG/DELAY FROM THE TIME THE THROTTLE INPUT HAPPENS AND A RESPONSE FROM THE MOTOR. THIS DELAY HAS BEEN AS LONG AS 2 SECONDS LEADING TO NUMEROUS NEAR MISSES. PORSCHE HAS INSISTED THE VEHICLE IS FINE AND REFUSES TO DO ANYTHING ABOUT IT. ON MAR 16, 2018, AT 04:28 PM, "(XXXX)(PCNA, CR_EXT)" <(XXXX)@PORSCHE.US> WROTE: GOOD AFTERNOON MR. (X), I AM SORRY TO LEARN OF YOUR DISSATISFACTION WITH YOUR VEHICLE. IN ACCORDANCE WITH THE EPA/CARB APPROVED EMISSIONS MODIFICATION, THE SHIFTING BEHAVIOR HAS BEEN ADJUSTED. ADDITIONALLY, THE ENHANCED AUTOMATIC ENGINE BRAKING FEATURE HAS BEEN REMOVED. WHEN YOU EXPERIENCE THE REDUCTION IN MPG NOTED BELOW, ARE YOU TOWING AT THAT TIME? BEST REGARDS, [XXX] CUSTOMER COMMITMENT SENIOR SPECIALIST US CENTRAL REGION AND CANADA INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *CC *TR
PORSCHE CARS NORTH AMERICA AS PART OF THE EPA/CARB SETTLEMENT MODIFIED THE 2015 CAYENNE IN A MANNER TO COMPLY WITH THE ORIGINAL EMISSIONS REQUIREMENTS. THE MODIFICATION HAS SIGNIFICANTLY AFFECTED PERFORMANCE I SUCH A WAY THAT THE VEHICLE IS NOW DANGEROUS IN CERTAIN SITUATIONS. WHEN MERGING ONTO HIGHWAYS OR ATTEMPTING TO OVERTAKE THERE IS A SIGNIFICANT LACK OF RESPONSE TO THROTTLE INPUT LEADING TO NEAR MISSES BY OTHER VEHICLES. THIS HAS BECOME MORE PRONOUNCED AS THE MODIFICATIONS HAVE HAD TIME TO ADAPT OVER TIME. PORSCHE HAS CONTINUED TO DENY AN ISSUE AND STATES THE VEHICLE IS OPERATING AS DESIGNED AFTER THE MODIFICATION. THIS SUMS UP OUR EXPERIENCE WITH THIS VEHICLE, IT IS TO THE POINT THAT IT IS UNSAFE AND DANGEROUS TO DRIVE
PORSCHE CARS NORTH AMERICA AS PART OF THE EPA/CARB SETTLEMENT MODIFIED THE 2015 CAYENNE IN A MANNER TO COMPLY WITH THE ORIGINAL EMISSIONS REQUIREMENTS. THE MODIFICATION HAS SIGNIFICANTLY AFFECTED PERFORMANCE I SUCH A WAY THAT THE VEHICLE IS NOW DANGEROUS IN CERTAIN SITUATIONS. WHEN MERGING ONTO HIGHWAYS OR ATTEMPTING TO OVERTAKE THERE IS A SIGNIFICANT LACK OF RESPONSE TO THROTTLE INPUT LEADING TO NEAR MISSES BY OTHER VEHICLES. THIS HAS BECOME MORE PRONOUNCED AS THE MODIFICATIONS HAVE HAD TIME TO ADAPT OVER TIME. PORSCHE HAS CONTINUED TO DENY AN ISSUE AND STATES THE VEHICLE IS OPERATING AS DESIGNED AFTER THE MODIFICATION.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.