The high-voltage battery pack in my 2018 Porsche Cayenne S E-Hybrid (VIN: [XXX] , approximately 81,000 miles) has experienced a noticeable and progressive reduction in battery range and performance. On February 20, 2026, Porsche White Plains (an authorized Porsche dealer) performed an inspection but was unable to duplicate an active fault code and declined to generate a battery State of Health (SoH%) report. No warranty repair was authorized. Porsche Cars North America (PCNA), Case #XXX, has since moved to close my statutory warranty claim, citing the absence of a duplicated fault. However, under New York State's adopted CARB emission warranty standards (6 NYCRR § 218-9.1), high-voltage propulsion batteries in TZEV/PZEV vehicles are warranted for 10 years or 150,000 miles from the date of original sale. My vehicle was placed in service in 2018 and remains within that statutory coverage window through 2028. PCNA has not addressed this statutory obligation or provided written confirmation of coverage. I also have not received the inspection documentation I formally requested on March 17, 2026, despite no case closure having occurred at the time of that request. As of the date of this filing, PCNA has not responded to my follow-up correspondence. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The worst 2018 Porsche Cayenne problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Electrical3
- Engine3
- Airbags2
- Fuel system2
- Driver assistance1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Electrical3
- Engine3
- Airbags2
- Fuel system2
- Driver assistance1
- Lights1
- Tires1
- Transmission1
- Visibility1
Recalls 1
Equipment
- What is wrong
- Porsche Cars North America, Inc. (Porsche) is recalling certain 2017 Porsche Cayenne Turbo S, Cayenne Turbo, Cayenne Plug-in Hybrid, Cayenne GTS, Cayenne Plug-in Hybrid Platinum Edition, Macan Turbo and Macan GTS vehicles, 2017-2018 Cayenne S, Macan, Cayenne Platinum Edition and Macan S vehicles and 2018 Cayenne vehicles equipped with the optional ski bag. The ski bag fastening strap may have been sewn with incorrect thread, possibly resulting in the strap seams tearing and the ski bag being unsecured in the event of a crash.
- Risk
- If the ski bag detaches during a crash, it can increase the risk of injury.
- Remedy
- Porsche will notify owners, and dealers will replace the ski bags, free of charge. The recall began January 10, 2019. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is AJ12.
Recall number 18V844000 · Recall details
See all 1 recalls for the 2018 Porsche Cayenne
Defect investigations
Desiccated Air Bag Inflator Rupture
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.
EA21002
Technical service bulletins for the 2018 Porsche Cayenne 687
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Manufacturer's Certificate for Overview of Approved Porsche A40 Engine Oils
- Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils
- Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils
- Manufacturer's Certificate for Overview of Approved Porsche C40 Engine Oils
- Special Tools and Equipment Information for alignment machines
2018 Porsche Cayenne fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.0L 6‑cyl Plug-in hybrid | AWD | 21 | 24 | 22 |
| 3.6L 6‑cyl | AWD | 16-18 | 23-24 | 19-20 |
| 4.8L 8‑cyl | AWD | 14 | 21 | 17 |
What 2018 Porsche Cayenne owners say
Most recent owner complaints, unedited.
Driving through a parking lot, less than five miles an hour, and suddenly heard a horrible knocking sound. Stopped and looked under the car. Nothing. Drove it very slowly to mechanic less than a mile away. Front drive shaft had collapsed and fallen down, according to the mechanic.
The contact owns a 2018 Porsche Cayenne equipped with Michelin Tires, Tire Line: Latitude Sport, Tire Size: 295/35/R21, DOT Number: (N/A). The contact stated that while driving approximately 45 MPH, there was an abnormal sound coming from the front passenger’s side of the vehicle, and the front passenger’s side tire started deflating. The vehicle was driven to the side of the road and was later towed to the local dealer who determined that the front passenger’s side tire sidewall had blown out. The cause of the failure was not yet determined. The contact stated that the vehicle had not driven over any object to cause the failure. The tire manufacturer was not contacted. The vehicle manufacturer was not notified of the failure. The failure mileage was unknown.
This is not accident related, but what appears to be a systemic issue related to Cayenne and Macan leather dashboards. The issue is related to delamination of the leather dash cover that can impede the safe deployment of the passenger airbag. Many cars are affected and the repair can be a significant expense to owners (~$10K) for vehicles less than 8 years old. There should be a recall to address a largely unaware owner base for a potential safety issue.
The Porsche Cayenne that equipped with leather dashboard are peeling off over the time. If the vehicle in an accident, the airbag on the passenger side dashboard may not deploy correctly. I am finding many cayenne owners are having this issue. I really hope NTSB can issue a recall.
While the vehicle was charging, the protective sheath near the power outlet of the charging cable had possible electrical or fire damage. No warning lights were illuminated. Upon turning off the power and unplugging the outlet, it was determined that the plastic near the plug melted and caused the power to short. I have been unsuccessful getting the manufacturer to resolve the issue. A recall under APB6 was issued but did not include model year 2018 which uses the same cable that is impacted with the recall.
Our 2018 Porsche Cayenne has a problem with the headlights and water intrusion that is affecting the functioning of the headlights. I took it to someone to look at and they said this should not be happening, that it is a manufacturer defect. I googled my car / year and there is a recall for headlight issues but for some reason my VIN is not included. It should be. How do I go about having Porsche North America fix this issue for me?
The day we took our Porsche home, we noticed a lot of heat generation in the car- but we thought it will be fine going further, given the attention to detail of Porsche's Automobile Engineering. The following days were not any better for my daughter- she missed a major accident because of the unexpected burnt smell and loud warnings of an overheat of the engine by Porsche in the middle of a highway. Due to her excellent driving record for the past 5 years, she was able to manage and stop in the middle of the highway at the curb of the road. She panicked so much so that, she stopped using the Porsche and borrowed our other cars, Benz and Lexus. I requested her to give Porsche another chance yesterday night. The same situation repeated again within a span of 10 minutes of her journey in Porsche; she had to stop in the middle of the road again due to engine overheat and burning smell and I went to pick her up as she got really scared. My son immediately informed the Hennessey Porsche North Atlanta, Georgia, the USA about this repeated situation but seems like they do not care at all. I think you must be aware that Dealerships play the most crucial role between your loyal customers and Porsche. We have not dared to take the Porsche out again after yesterday. The car smelled so burnt, the whole garage smelled bad and we had to move the car into the open driveway. THE CONSUMER STATED THE DEALER AND MANUFACTURER WERE MADE AWARE OF THE FAILURE. THE DEALER ATTEMPTED TO REPAIR THE VEHICLE, BUT THE FAILURE PERSISTED. THE MANUFACTURER OFFERED $1000.00 IN COMPENSATION. THE CONSUMER REQUESTED TO BE REFUNDED TOTALLY FOR THE VEHICLE.
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.
When trying to accelerate into traffic vehicle will experience what feels like a dead spot in the accelerator and then lurch forward at a high speed this condition has been reported on numerous complaint site concerning various porsche vehicles and specificall concerning porsche cayenne dealer says car is fine.unsafe to drive since you never know when it will accelerate.
Compare the 2018 Porsche Cayenne
Other model years
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Questions about the 2018 Porsche Cayenne
Is the 2018 Porsche Cayenne reliable?
Owners have filed 13 complaints about the 2018 Porsche Cayenne, fewer than a typical Cayenne model year.
What is the 2018 Porsche Cayenne year score?
The 2018 Porsche Cayenne scores 86 out of 100 (good). The score compares it with the other model years of the Porsche Cayenne: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2018 Porsche Cayenne?
Electrical system, with 3 complaints. Next is engine (3).
How many recalls does the 2018 Porsche Cayenne have?
1 recall, covering equipment.
What gas mileage does the 2018 Porsche Cayenne get?
Official estimates for the 2018 Porsche Cayenne range from 17 to 22 mpg combined. The most efficient version (3.0L 6-cyl plug-in hybrid, AWD) gets 21 city and 24 highway.
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