Cayman 718 GPF Failure

[911hillclimber]

Repeating the condition, the analysis, and the findings is important.
Might I suggest a 'sticky' link to a purpose written by Dave summary of this ridiculous issue at the end of further posts so anyone new to this can gat to a tech precis instantly, and no need to scroll all the pages?
If this is printable an owner can take this into an OPC or most likely now a Porsche Independent to persuade or guide the workshop?

My perception of Porsche continues to sink.

 

[Cyclemotor1958]

Hi Tony,

Thanks for spotting the ash value 76.08% across both of these vehicles GPF data, if we could get more GPF data reports showing multiple visits to our Dealers I'm sure we could find more reoccurring information.

Its often said its all in the detail, so Ive compared your data to the other cars data with both showing the same ash value above.

Your car The other car

K211 soot 0.00 0.00
K221 soot 1.96 5.88
K230 ash cal 0.00 0.00
K231 ash measured 76.08 76.08
K241 diagnosis val 0.00 0.00
T255 exhaust temp 512.48 373.79
T251 exhaust temp 488.85 360.04
K251 diff pressure 6.22 0.00

So if you look back at our other cars differential pressure readings from the PDI you can see reoccurring hPa readings.

Differential Pressure hPa

PDI 2.90 Ash load 0.00%
Wheel repair -0.58 74.12%
1st service -0.58 75.69%
Regeneration 0.00 75.69%
Mot 0.00 76.08%
Diagnostic 0.17 100.00%

This car also had a soot measured K221 value of 21.57% when the car had covered only 14 miles, before he took delivery of his new car.

And also it had the DTC code P0234 present on quite a few visits.

This code is a turbocharger overboost code, this is well known on these cars, usually down to a seizing actuator linkage pin.

There has been a bulletin out on this issue for quite a while.

When you look at the internal memo that was sent out last March it mentions several causes of high ash loads that have been found across various vehicles.

It said it was important to check the operation of the turbocharger actuator to ensure it was functioning correctly.

So when this car went in for the diagnosis of the warning light on, and the fault code P242F ( ash load to high) why wasn't this detail looked at more closely.

Why wasn't the checks on the memo carried out before the customer was contacted.

He was told the GPF had to be replaced, at a cost of £9,300.00 and any other diagnosis time would be charged to him.

He has asked several times for a back pressure diagnostic check to carried out, and he would pay for it, but this has been refused every time.

They have the PWIS data that shows this fault was on the car at the first service, and they even carried out a regeneration to try and reset the ash %, it didn't work as you can see.

And the worse thing is, the customer wasn't told about the regeneration attempt, the high ash value, and was never aware of the turbocharger issue either.

We are over 5 months in with this car, trying to get the Dealer to do the correct diagnosis of this fault, even though they have an internal memo that confirms that this is a manufacturing defect, and has been for a very long time.

Remember the memo says the new GPF (982254400AF) has been modified to prevent this issue. All vehicles with a production date later than December 2019 should already have the modified GPF fitted.

So they would know which cars didn't have the modified filter fitted durring the first year of production up to December 2019.

Their warranty data would show the modified replacements, so all these other cars should have had the new modified filter fitted.

We have been slowly dealing with these other cars, its taken us over three years, but sadly we couldn't deal with them all.

Whats even more appalling is that most of the owners who contacted us that required new filters have sold their cars, because they were blamed for this fault, wrong engine oil and driving style.

This is absolutely bloody ridiculous that these Dealer's and Porsche are not telling the truth about this well known fault on this car, its scandalous, and it has to stop.

Dave

 

[Wrightrubber]

Hi Dave
It is totally baffling to me, that Porsche and the Dealers don't understand what they are doing, they continually want to charge the customer £9500 for a filter that isn't blocked and replacing it doesn't solve the problem, look at all the work they did to Paul's car and it still didn't solve the issue, proving to me that they really don't understand what they are doing!!!
Keep up the good work.
Regards
Mark

 

[Cyclemotor1958]

Thanks Mark, and 911Hillclimber,

Really appreciate your comments, we will soon be hopefully getting a video showing a separate backpressure reading of a car with a 100% ash reading, so we can prove how ridiculous this situation really is.

Sadly it will not be coming from a Dealer

Will keep intouch
Dave

 

[911hillclimber]

Wonder how the next owners of these cars with the fault get on?

The car gets sold on somewhere to someone who gets the light.

MoT failure notice will bring the car to a quick off the road and then the car is a paper weight unless a fix is found.

The number of irritated people will grow! And possibly never buy another modern Porsche unless brand new.
Slippey slope to me...for Porsche.

 

[Wrightrubber]

Exactly right! I have owned four Caymans, all direct from Porsche but I will never own another one after the way I was treated by Porsche GB and the Dealership.
Regards
Mark

 

[Motorhead]

I’ve said it before, but this issue really is a shocking indictment of Porsche, a company which has always prided itself on its engineering prowess. The fact that it’s clear that the factory is either unable - or unwilling? - to instruct its dealers to carry out some basic, simple tasks identified by Dave beggars belief!

Keep up the good work Dave. Hopefully your continued perseverance eventually will lead to the correct and positive outcome for those owners affected.

Jeff

 

[Wrightrubber]

Hi Dave
Just to re-cap how I was treated by Porsche OPC, when I was told my filter was 100% blocked and needed replacing, at a cost of £5800 + VAT, (it was 3 years ago....a lot more expensive now!) they said I had to pay for it as it was my fault, due to my style of driving, short journeys!! I pointed out a few things, 1) I was never informed it had a GPF fitted.... 2) I was not informed I couldn't drive it for short journeys.... and 3) I had extended warranty and nowhere in the warranty did it mention GPF in the exclusions (the wording was changed later on to include the GPF in the list of exclusions - I believe this was another indication they knew this was going to be a problem!!!)
You (Dave) intervened and they agreed Porsche GB would pay a third, the Dealership would pay a third and I was to pay a third, I reluctantly agreed, after them having the car for 9 weeks, I was also told by the dealer if I didn't accept this offer I had to collect the car and take it elsewhere!! Excellent customer service...I don't think!! They then sent me the GPF report and you (Dave) looked at the data and it didn't make any sense, the filter couldn't possibly be blocked, armed with this information I went back to the OPC where I purchased the car (part of the same group as my local OPC) and they agreed to refund my contribution.
They agreed to monitor the ash content and I returned to the dealership on three further occasions and the percentage readings were back up to 50%+, when I asked what happens when it gets to 100% I was told 'it will need replacing again but you will have to pay the full amount'!!.
I was also told by the service manager not to drive the car if the journey was under 30 mins!! Absolutely ridiculous!! So basically I had a car that I could only drive on specific journeys. I've never heard so much rubbish in my life!
The thought of going through another battle with them when the filter is a 100% full (which it never was in the first place and replacing the filter doesn't solve the problem) was too much so I sold the car and genuinely will never buy another.

Regards
Mark

 

[Cyclemotor1958]

Hi Mark,

Wow that was over three years ago now, and my first post on this subject was to mention the possibility that a faulty AOS on your car could cause your GPF filter to block up with Ash quicker than it should do.

We've discovered alot along the way, it wasn't a faulty AOS, because if you remember I sent you a manometer to check it yourself. We also discovered the correct vacuum reading for a full functional AOS on your Cayman 2.0.

We also discovered that Porsche Customer Care confirmed in writing to one of our owners that had a blocked GPF filter replaced by Porsche Reading. Was replaced because the Technical and Warranty departments considered it to be a manufacturing defect.

We also discovered this same issue on a 991 2019 car, which had the same GPF data that made no sense at all.
We worked very hard on this problem and convinced the Dealer and Porsche to pay for the new filter.

This new filter was checked a while ago and its already got 21.90% of ash recorded.

We discovered after checking lots of our faulty vehicles that none of these cars had an adaptation facility on PWIS to reset either the differential pressure sensor and the GPF to zero.

We discovered an internal memo that Porsche sent to all their Dealers last March that informed them to check for other possible causes of internal oil consumption if the car was showing the fault code P242F.

We also discovered a written conformation in the memo that Porsche had been having the very same issue on these cars in the first year of production.

They came up with a modified filter with a new part number.

We also discovered that it wasn't just model year 2019, we found cases on 2021 and surprisingly a 2023 vehicle with the same GPF data showing an ash value of 50.59%, after only 16K, with no differential pressure showing.
On this car the owner asked the technician who gave him the Ash value, did his car have the adaptation function, he laughed had said none of these cars have it.

We have finally discovered this fault has nothing to do with wrong engine oil, driving style, incomplete service history, its just plain and simple software.

We have further confirmation its software, but we will leave this for a other post.

Sorry Mark this has gone on a bit, but we have invested over 3 years in providing these discoveries.

Kind Regards
Dave