PORSCHE Complaints

This vehicle has an engine which has rocker arms that are known to fail. The manufacturer has not issued a recall to fix this issue which can result in a catastrophic engine failure. They have acknowledged the rocker arms in pre 2018 models to be defective and insufficiently reinforced to handle the strain of the valve train.

My Porsche Taycan unexpectedly applies the brakes on its own while traveling at highway speeds and flashes a red warning message instructing me to take control of the steering wheel, even though both of my hands are already on the wheel. This is extremely dangerous because sudden braking at high speeds creates a major risk of rear-end collisions and loss of control. When It Occurs: This issue started recently and has happened multiple times under normal driving conditions (clear weather, open road, both hands on the wheel, no imminent obstacle). It appears to occur without warning and without any legitimate reason for emergency braking. Approximately 3 times in 1 month. Dealer Response: I reported the problem to my Porsche dealership. They claimed this behavior is “normal,” but also acknowledged that many other owners have experienced similar issues. Despite this, they offered no fix and did not classify it as a defect. I strongly disagree that this is normal—this is a critical safety hazard. I have another upcoming appointment for an additional check June 29, 2025. Safety Risk: Unexpected braking at highway speeds could lead to a rear-end crash, loss of control, or serious injury. This is not driver error. The vehicle is misinterpreting conditions or malfunctioning, and the warning to take control of the steering wheel despite both hands being on the wheel suggests a possible sensor or software failure.

String gas odor while driving. Upon inspection it was determined that a fuel line was leaking on top of the engine which requires an engine out repair. There are several other people discussing the same issue of Rennlist.com a Porsche enthusiast site. Seems to be a problem.

I brought my vehicle in to a Porsche dealer on May 24th 2025 for a noise coming from the front right wheel area. There were some other issues but those were not safety related. They stated the vehicle has an open recall campaign for a brake hose. That there is a risk it could break. It is now July 18th 2025 and the dealer has had the car the entire time since May 24th 2025. They are saying they can't complete the safety recall due to no parts. Porsche has issued a STOP order for dealers selling affected vehicles. Porsche has issued a STOP order for dealers to use affected vehicles as loaners. It seems I should STOP driving the car as well yet the dealer indicated it is to give it back to me unrepaired.

I was sold a vehicle with the incorrect front brakes, an open recall on airbag and bad transfer case all looked at and confirmed by a dealer .

The leather dashboard has shrunk to the point where the the Porsche dealer recommend replaceing it. This appears to be an issue serious enough to prevent the airbag from deploying correctly if in an accident. This appears to be a common issue.

Dashboard has an issue where staples have come out, I am told this may impact the air bags in an accident. Dealer recommended selling the car. This is recurring issue that is very common.

the piece of leather trim sit on top of dash panel below the windshield that cover the airbag shrink and peel off the main dash. The passenger air bag might not deploy properly in the event of frontal collisions because of a loose piece of leather cover it.

Seals around both headlights appear to be improperly/weakly sealed. Water intrusion is coming in from light rain or even a car wash causing entire headlight system to shut off until the moisture dries up often while driving. This vehicle has matrix adaptive led headlights and there is no self service bulb to replace since they’re leds. Local Porsche dealer service advisors appear to know this is a common issue but state Porsche has yet to do a recall and they have no fix option and only offer to sell me a full headlight assembly replacement.

As I was making a turn onto another avenue, and accelerating to blend into traffic flow, dashboard messages suddenly appeared 1)"Engine control error, driving still possible, see dealer." 2)"Active lane keeping not available, driving still possible, service required" 3)"Adaptive Cruise Control not available, driving still possible, service required". Adaptive cruise was not engaged at the time of the error. The car lost almost all power, despite saying "driving still possible"; cars behind me had to brake hard as my car would only go about 7-10mph tops with accelerator firmly depressed and engine began to run very roughly. I coasted to shoulder of road, took video of error messages, turned car off and restarted car which cleared messages and car regained normal operation. I was glad this happened in-town and not when merging on a highway. This is not the first time the car has issued sudden warning messages stating certain systems had failed only to be cleared by restarting the car. I have taken the car to the dealer before to have them research the issue but they say errors cannot be replicated. However, this was the first time Engine control message posted and was the first time the car lost power and put me in danger of not being able to control the car's speed in traffic. I have lost faith in the car's control systems. I can live with lack of cruise control or lane keeping, but I cannot tolerate sudden lack of power than can cause an accident. This is my 3rd Cayenne, and unfortunately on this model, the electronics are ruining an otherwise well designed vehicle.