2019 Porsche Cayenne

I purchased a Used Porsche Pre-Owned Certified 2019 Porsche Cayenne Turbo SUV on February 22, 2025, and within 4 to 6 weeks, the front brakes started to squeal very loudly when the vehicle comes to a near- stop. The dealership (Porsche River Oaks, 4007 Greenbriar Dr, Houston, TX 77098) tells me that this is normal squealing due to the type of brakes that this car has (PSCB). The squeal is louder than typical brake squealing and shouldn't appear on such a newly purchased certified car. I am reading multiple complaints on the internet about the squealing problems with the Porsche Surface Coated Brakes (PSCB) that I have on my vehicle. I am also seeing that. Porsche Cars North America, Inc has issued a Technical Service Bulletin 120/22ENU 4652 published on Sept 9, 2022, on how to fix this problem for its customers with a special brake disc and brake pad with better acoustical properties. The parts for this repair are extremely expensive. My car is supposed to be under warranty, but the service technician has offered to only clean the brake pads which the service advisor tells me should suppress the brake squeal for a short period of time, but then told me that the noise will come back due to the type of PCSB brakes this car has. I feel like I have been tricked into buy a car with defective squealing brakes and Porsche Cars of North America knew about the problem with these PSCB brakes. My worry is that Porsche Dealerships, know how to temporarily fix this squealing problem when they sell these vehicles by cleaning the brake pads.

The A/C in this 5 year old vehicle no longer works. There are no warning lights or anything to suggest the A/C is no longer functioning, other than turning it on to see if it works. The weather would need to be warm enough to test it. The dealer said it is due to the Evaporator core, and to replace it would cost $8,000.00. Upon search, many others have had this same malfunction. Audi uses the same part in their vehicles and in 2021, they revised their new car warranty to include the A/C evaporator for 10 years/100k miles. Porsche should also commit to this action as they are using the exact same faulty part and these vehicles cost even more than the Audi’s.

2019 Porsche Cayennes (and other Porsche models) have LiFe P04 lithium batteries that have an internal Battery Control Module that causes a "Battery Low " indication. Porsche has been updating the software/ firmware for this module, only for it to fail again. Eventually, the battery will fail, lose charge, and become dead. There are no after market batteries available and if you are 1 mile out of the warranty period, Porsche forces you to buy a new replacement battery from them for over $2,000.00 USD plus labor. This battery failure condition for vehicles with this type of battery is well known by Porsche and they now use a completely different type of battery in their newer models. This failure should be considered a Safety issue and concern since the battery powers every safety feature the vehicle has to offer. There are pages upon pages of testimonies on the Rennlist forum website for Porsche owners and all have been advised to contact Porsche Cars North America and only a small percentage have had any luck with that. Porsche should release a recall to modify the system to the newer, more dependable battery for affected vehicles.

Porsches with LiFePO4 Lithium batteries (like mine 2019 Cayenne S) have a software/hardware error that causes the battery to incorrectly send a code to the battery management system so that it will suddenly shutdown the battery permanently and will require a full battery replacement, which the dealers abuse its customers by charging $3,000 to $5,000 dollars and give a battery replacement date as almost one year later. Porsche has internal TSBs but it is not recalling all the customers to have the software update for the controller/sensor bug/defect so that the battery management system will not overcharge the Lithium battery and damage it or cause the battery to issue a software code that preventsbthe battery from waking up or be usable. Texas has temperatures of 110 F, and becoming stranded because the battery gets incorrectly/permanently shutdown is a death sentence to Porsche customers. Porsche is being arrogant with their customers and deeply profiting from this know defect. There are a series of small battery shops that are making money from Porsche’s defective battery controllers/sensors and charge around $500 to $800 to replace the battery sensor/controller and programming the new controller as long as you send them your dead battery. Porsche will not reprogram rhe battery controller/sensor if you replace the original battery, with no explanation on why. Anybody driving a Porsche vehicle that have these battery defects in the controller/sensor/programming will perish, together with their passengers, if the battery gets shutdown and become unusable in a 100+ F, 110+F or if yhey get stranded in a freezing situation. It's a deadly time bomb waiting to happen, if it hasn't happen already since Porsche is not being straightforward. Porsche even sells these defective Lithium LiFePO4 batteries on old cars 2019 models and others, and does not disclose to them that the battery can die unexpectely and hjat the battery is not within the warranty.

In September 2022 the yellow battery warning light appeared on my dash while my car was still under warranty. Porsche had an open Campaign WMJ9 that involved a software update that resolved the issue. Last month, June, while my car was now out of warranty the same yellow warning light appeared but this time the dealership recommended i replace the battery at a cost of $3,200 Porsche refuses to accept that these 2 instances are related and that the battery should be covered since the software update during my first service visit didn't offer a long term solution. to make matters worse the lithium battery used in my vehicle has been an issue for porsche to say the least.

THERE'S AN ELECTRICAL ISSUE WITH THE VEHICLE (it is an E-Hybrid) with ERROR MESSAGES THAT RUN IN A CONTINUOUS LOOP (ACC NOT AVAILABLE, PAS RESTRICTED, DRIVING LIGHT CONTROL ERROR, HIGH BEAM ASSIST NOT AVAILABLE, LANE KEEP ASSIST RESTRICTED). THE LOCAL DEALER HAS NOT YET BEEN ABLE TO FIX THE ISSUE. CAR IS UNDER WARRANTY AND HAS BEEN IN THE SHOP FOR A MONTH. WE WERE CALLED TWO TIMES TO PICK UP A "FIXED VEHICLE" AND EACH TIME WE HAD TO RETURN THE CAR ALMOST IMMEDIATELY UPON LEAVING THE DEALERSHIP SINCE THE PROBLEM WAS NOT FIXED. I'VE CONTACTED PORSCHE CUSTOMER SERVICE BUT AS OF YET THERE IS NO RESOLUTION. IT IS VERY CONCERNING SINCE SOME OF THESE ERROR MESSAGES DO AFFECT VEHICLE SAFETY.