Porsche Cayenne won't start problems

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 Sep 8, 2023 · Electrical · TX

I was driving the auto and parked in my garage without any indication of a fault. I attempted to start the car about 30 minutes later and the car would not start and gave an error message that said "change driver" I tried both keys and neither would allow the car to be started. There was no starter noise indicating a weak battery. I had to have the car towed to the dealer after the tow company found a way to unlock the drive shaft with a key that is part of the car service tools. I could not move the car if I had stopped on a roadside. The dealer had never seen this issue before. The car was in the shop for a week to correct the fault from March 23 to March 31. The dealer claimed it was a software fault. There were no warning indicators or messages that something was wrong with any component or system.

Filed Jun 4, 2023 · Electrical · NY

my car had a problem in the hybrid part, before doing the diagnosis they said 3 different problems, when they gave me the diagnosis they said they didn't know what it was but that to begin with “it could be “ the components $13,000 to fix. but my car is under the 8 years or 100,000mls hybrid system warranty, so i contacted porshe headquarters and they said the car was out of warranty. so i called porche in Fremont (where they have mentioned the warranty on their website) and 3 people confirmed that the car is under warranty by VIN n. I called headquarters again and they said they needed this guarantee in writing. So when I called Fremont again 3 weeks later they said the car is not under warranty, meaning they changed the whole conversation within 3 weeks. I already confirmed it on CARFAX and I am under warranty but I never received any responses to emails or phone calls they are ignoring me because they don't want to assume the warranty. Fremont confirmed that I had 6 months or 19,000 miles until the warranty expired, and strangely 3 weeks later that warranty no longer appears in their system. in my opinion they don't know what the car has and they are trying to escape the warranty because there are few months left to finish, that's why they don't give me answers, I haven't tried all possible options and I can't find help to solve this problem, I'm stuck at home dor the last 3 months with 2 children without car. because my only car is at the porsche parked waiting for someone to take over the car's warranty. mentioned that the car had no accident, it was just parked in the garage and one morning it didn't start and had to be towed. Terrible costumer service

Filed Sep 7, 2021 · Electrical · OH

On August 21 2021, I was out shopping. When I went out to return home, the car would not start. I could not jump start it or anything. I had it towed to the dealer. I found out from Porsche and dealership that my car was disabled by Porsche Connect. I do not have this service or pay for it. On Friday Sept 3, I was informed by Porsche customer service that it disabled my car because the original owner (in 2015) changed their phone number. So Porsche assumed stolen and shut down. I did not authorize this, I did not sign up for this service. They will not fix the car because they say it is out of warranty. Because I do not know the code to turn the car back on, they want to replace parts and say I have to get the Porsche Connect App. This is a known issue at Porsche because the dealer found a TSB on it. They are not taking responsibility for shutting down the car with out my permission. This is a safety issue depending on where I could have been.

Filed Nov 20, 2018 · Electrical, Transmission · 7 miles · FL

A start ignition won't start and I have to plug the key in order to started the vehicle

Filed Feb 12, 2018 · Electrical · 83,534 miles · MN

The car cut out as I was crossing a intersection while in motion leaving the car disabled in the middle of a busy intersection, luckily other drivers saw the problem and went around me. All warning lights came on including the ignition lock fault. I turned it off and after 2 minutes it restarted. The next day the car would not start, the ignition lock fault came on, and then all of the other warning lights came on and the engine would not turn over and was locked in park. This happened once before in feb 2017 when a corroded wires were found in a main bundle of wires in the drivers footwell. There was no water on that area and nor has there been any water on the car or the footwell. I have had weathertech mats in place hte whole time to prevent that. This is a safety concern that it could go dead in the middle of operation not just a starting issue. I have reviewed technical bulletin the federal safety agency 10056337 which does not provide any explanation for implying that the lack of feedback has lead to the factory not knowing to fix the problem. Porsche need to fix this problem the improperly spliced wires and the bundle need to be retrofitted in a way to protect them from ongoing corrosion that in my case happened happened twice the second time on 6,000 miles after the last in a car that is kept in a garage.

Filed Jul 11, 2017 · Fuel system · 71,000 miles · SD

The high pressure fuel pump, car drove with very little ability to speed up. It sputters when trying to accelerate. It won't start right away, building up fuel pressure. I was driving and it just became unresponsive to the gas peddle. I slowed and stopped, restarted and just had a very weak car. It takes some time to reach 50mph. Dangerous if on the hwy.

Filed Aug 27, 2014 · Electrical, Transmission · 50,000 miles · NM

Vehicle was parked in garage. Went to use it, opened door to drivers side, dash reads ignition lock fault. Would not start, would not come out of park. Towed to dealer (after towing co. Did emergency unlock of transmission to get out of garage. Vehicle has been at porsche dealership for a week now, told at first ignition switch was bad. Replaced and still not functioning (no start) now told control module must be replaced as it got "wet" and vehicle interior floor had gotten wet. Research on internet shows many other people have had this problem with electrical components getting wet from a defect in car.

Filed Jan 23, 2014 · Fuel system · 4,700 miles · PA

The car would not start after multiple attempts. The SUV needed to be towed to the nearest dealership. They said the fuel gelled and recommended that "I" have the fuel station place the 'correct additive' to the diesel fuel. My husband has had two diesel vehicles from other car manufacturers for the past 4 years, but he has never had any engine start problems. He is still filling his tank at the same station. Since then, I have changed the diesel fuel station and now go to another busy place. The same thing happened today, two (2) weeks later, with a different diesel fuel source. Vehicle would not start (odometer reads 4980 miles) the dealership (from where the SUV was purchased) could only make the recommendation to move the vehicle, which won't start, to an indoor garage. In our area, this is impractical. Very few companies and stores provide indoor garages. I have been on the phone multiple times. The porsche dealership has not been able to come up with any other recommendations until now, 7-1/2 hrs since my first call.

Filed Sep 28, 2006 · Engine · 16,000 miles · NV

Vehicle runs inefficiently when cold and smoke has been noted from the exhaust pipe when vehicle is driven. It will turn over, but not catch. Dealership was told by porsche to use a lower octane fuel (87) to remedy the problem. This contradicts the information in the owner's manual which states only premium unleaded fuel 91 or higher should be used. If the vehicle is taken into a lower altitude area, the fuel should revert to premium. This is a brand new car and it does not start when the engine is turned over, leading me to believe there is a manufacturing defect in the design of the engine. My husband owns a 2004 cayenne s, which has a 4.5 v-8 instead of the 3.2 liter v-6 and it starts immediately, even when cold.