Porsche Cayenne check engine light comes on

Filed Aug 11, 2026 · Electrical, Engine · TX

Nearly 25% of the total time I have owned this Certified Pre-Owned vehicle (146 out of 564 days), it has been non-functional and in the shop — roughly 1 out of every 4 days of ownership. I am a [XXX} with a [XXX] child, and I purchased this vehicle as a Certified Pre-Owned (CPO) Porsche — expecting the manufacturer's rigorous inspection and warranty to ensure reliability and safety. Instead, the first breakdown occurred within just 1 month of purchase, and the vehicle has since failed six separate times over 18 months (Feb 2025–Aug 2026), totaling 60+ days out of service, despite extensive component replacement: [XXX] (≈1 month after CPO purchase) – Battery failure; car would not start; towed at 2–3 AM. [XXX] – No-start; fuel tank drained/refueled ("improper additive"). [XXX] – Low fuel pump replaced. [XXX] – High fuel pump, all 6 fuel injectors, DME system replaced. [XXX] – Recurring no-start; repurchase denied May 7, 2025; Porsche later claimed root cause found (mechanical part) and replaced it. Aug 1, 2026–ongoing – Check engine light returned; misfire on cylinder 4 and coolant leak into vacuum system found. Dealer replaced coolant pump/vacuum components, updated DME software — check engine light reappeared on the dealer's own test drive. Why This Is Especially Dangerous: A CPO vehicle should not fail this quickly or repeatedly. It raised serious concern that either the inspection was inadequate or a pre-existing defect was never disclosed. My child rides in this vehicle regularly. A sudden stall or power loss at highway speed, at an intersection, or during school pickup/drop-off could cause a serious collision, endangering my child's life and my own. As a [XXX] with no backup driver/vehicle, an unexpected breakdown have cost lost work time, unreimbursed Uber expenses, and childcare disruptions. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 9, 2025 · Acceleration, Engine · CA

While driving my 2019 Porsche Cayenne S on the freeway, the check-engine light came on, followed by a message on the dashboard that read “Engine Control fault – Driving permitted – Visit workshop.” Moments later, the vehicle suddenly lost power and decelerated from about ~75 mph to around 55 mph, even though my foot was still on the accelerator. I am [XXX] pregnant and had our [XXX] child in the car at the time. The unexpected loss of speed in fast-moving traffic was frightening. I had to quickly change lanes to reach the slower lane and avoid being hit by other vehicles. After reaching safety, I drove the car to an authorized Porsche dealership, where technicians found an active water-pump leak with coolant entering the vacuum system, which may have caused turbocharger and engine-power failure. This is after I replaced the water pump last year at another porsche dealership. A photo taken during the incident shows the dashboard warning message as it appeared. This incident created a serious safety hazard, as the vehicle displayed “driving permitted” even though it was at risk of a sudden loss of propulsion at highway speeds. The car and the failed components are available for inspection. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 29, 2024 · Fuel system · CO

Engine light came on and vehicle decelerated while making a turn in traffic. Based on the owners manual and code test, it comes up as a DPF issue. We could have been seriously injured had the oncoming traffic been closer to us or had someone attempted to follow me on the turn. When the car lost power, I could not accelerate to complete my turn. The problem has been duplicated by my husband who has some mechanical expertise, but the next step would be to take it to a dealer. It is available for inspection, but it is not safe to drive. The check engine light and the glow plug lamp came on at the same time. It happened once before on the interstate coming across I-80 on the interstate. In the middle of nowhere with no cell phone service, we were able to pull over, shut off and restart the engine which cleared the code for the rest of the trip. Then it didn’t do this again for nearly two months.

Filed Jul 6, 2023 · Brakes, Electrical · NC · 2 injuries

For the past nine years, my vehicle has recorded multiple safety issues (trunk not closing/breaking, check engine light, catalytic converter misfire, keyless electronic entry issues, glow bulb light, turn signal bulb light, windows not rolling up, leaking fluid on the passenger side, burning smell coming from the vents, electrical issues with the radio, sunroof intermittently not opening/closing and the key not turning the vehicle on. Over the past nine years, I have taken the vehicle to numerous Porsche dealerships per the federal mandate from Porsche USA / Porsche UK. To date, the Service Manager, Chris Sansbury and General Manager at Brian Harris Porsche, and Porsche USA, refuse to fix the vehicle. My vehicle is still under factory warranty. I am a person with multiple disabilities. The dealerships (Jim Ellis Porsche, Hennessy Porsche, Leith Porsche, Brian Harris Porsche) have charged me thousands of dollars. I have been extremely sick and desperately need your help. Please help me!

Filed Dec 16, 2022 · Fuel system · TX

We purchased the 2005 Porsche Cayenne from my brother-in-law in August of 2022. He had owned the vehicle for at least a year before I purchased it from him. Shortly after the purchase, I noticed the engine light came on. On 09/12/22 a strong smell of fuel was emitting from the vehicle in a Walmart parking lot in Denton, Texas at approximately 1030pm. I noticed a large puddle of gasoline on the ground under the vehicle and it was steady stream of fuel while the vehicle was running. The vehicle was completely unsafe to drive for fear of ignition and fire. Due to the time and location, I had the vehicle towed to my mechanic approximately 3 miles away for diagnosis and/or repair. The closest Porsche dealership was approximately 25 miles away and the tow bill would have been excessive. Mechanic identified the problem as a cracked fuel filter flange/housing that sat on top of the fuel pump. The cracked fuel housing was replaced and the total for parts and labor was $462.48. No leaking fuel since repair. A few weeks later my brother-in -law contacted me and advised he had just received a recall (OCTOBER 2022) in the mail from Porsche for the exact part I had repaired (17V‑576 / AH10). He mailed me the recall and I contacted Porsche for a reimbursement. They stated they only refund for repairs done at a Porsche dealership. I believe Porsche should cover the repair cost for their faulty equipment even after the recall was received. A Porsche Service Center would charge Porsche Corporate much more for this repair than what I paid. Please assist me in getting a refund for my expense of ($462.48) for the repair of Porsche's recall. Thanks [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

Filed Nov 2, 2022 · Fuel system · IN

The contact owns a 2005 Porsche Cayenne. The contact stated that while refueling the vehicle with the engine running, the vehicle shut off. The vehicle hesitated while restarting. The contact detected fuel leaking from the vehicle. The check engine and oil light warning lights were illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was unknown.

Filed Sep 17, 2021 · CA

On my Porsche Cayenne e-Hybrid model, the check engine light came on at less than 1000 miles. Porsche does not know why this happens but I've heard them claim that it's a software problem that has to do with how the car communicates with the charging system. Based on my research, there has been many other owners of the same vehicle with this problem. My vehicle has been in the shop for well over 30 days and Porsche still doesn't know what to do.

Filed Sep 15, 2021 · WA

Check engine light thrown intermittently and dealer is unable to reproduce issue. Multiple incidents of the same issue by other owners. https://rennlist.com/forums/cayenne-9y0-2019/1248120-grr-cel-code-654-miles-on-new-21-cayenne.html Pattern is the same. Take delivery of new car, get CEL <1000 miles, take to the dealer and dealer is unable to permanently fix or reproduce.

Filed Feb 3, 2021 · Acceleration, Transmission · 12,000 miles · LA

Tl* the contact owns a 2014 porsche cayenne. The contact stated that while driving at various speeds, a rattling noise occurred before the vehicle loss power and stalled. During the failure, the check engine warning light had illuminated. The vehicle was taken to the local dealer porsche of new orleans located at 3700 n causeway blvd, metairie, la 70002 who replaced the transmission transfer gear. Approximately 20,000 miles later the failure recurred and the contact was informed that the transfer gear was faulty and needed to be replaced a second time. In addition, the speed sensors in all four wheels were faulty causing the vehicle to randomly slow down and not accelerate. The sensors were replaced and the failure was remedied. The manufacturer was notified of the failures but no assistance was offered. The failure mileage was 12,000.

Filed Dec 16, 2020 · 99,700 miles · TX

Recall work mishandled and caused problem: I went to porsche for a regular oil change. They said that there is an active recall on camshaft and they can also be performed while the car is in. Now when I went to get my car back they said the engine light was on and when they checked the tech says the parts seems to be all new and it was done at a different work shop. They asked me to go to the shop and check with them. But I told them it was done few months back and I had no issues at all and the car didnt have any issues when I gave it for oil change( no check engine light). Also when I entered the car I was able to smell a thick oil smell which I informed becky the service consultant and I was told that it could be oil spill when they did oil change. I asked if the issue might be related to the camshaft work they did but they promptly said it was not related. So I took the car to the auto shop ( porsche certified shop) to have them check it. The shop checked and didnt find any issues with their parts they replaced since it was covered under warranty they went ahead replaced the part and the check engine light sign didnt go away, so they performed smoke test and found out the intake leak coming from a sensor seal on the valve cover. They said this is because of the camshaft work that has caused a large air leak in the engine setting the check engine light. Also when they checked the covers they found that there were 2 aluminium screws that were broken . When the cover was removed the alumimium screws were supposed to be replaced which were not and the old ones were used which lead to tension and they were broken the auto shop has provided me with all the details and evidence of the issue along with video to showcase.I need the federal safety agency assistance to help me guide on this issue caused by the dealership to my car while working on the recall.