Cayman 718 GPF Failure

[patersont718t]

Well as expected Porsche OPC refused to diagnose my fault as it is a GPF issue unless i pay for it, they also stated its not covered under extended warranty but are willing to help me follow up with Porsche direct. I have submitted a request for all data relating the GPF in particular the Particulate filter, bank 1 - oil ash load measured 100.00%. Initially they said they could not retrieve the data without plugging my car into their diagnostic machine for which i would have to pay. I challenged this and they are now going to get a technician to retrieve the data off their system. Once I have the data I will then go from there.

 

[Wrightrubber]

Hi Dave
Just looking at Tony's post above, have Porsche GB been back to you as promised by Porsche Stuttgart?Any news??
Regards
Mark

 

[Cyclemotor1958]

Hi Mark,
Sadly no, Porsche GB emailed me on the 21st of April see below.
I can confirm that your query has been raised to the relevant departments for review and would be grateful if you would please allow us the time to further investigate your concerns.

Once I have a response from the team, I will be back in contact with you.

However, please do not hesitate to contact us in the meantime should you wish to discuss your issues further.

Hopefully Mark it should be soon, so we can prevent Tony's experience at a Porsche Dealer when this light comes on.

Fingers crossed

Dave

 

[Scrounger]

I'm afraid enough is enough Dave and you have to draw a line in the sand. It's time to take it to the motoring press. Porsche are obviously not interested and, with the best will in the world and your efforts, they are still unwilling to get in touch with you...at all! I understand that you don't want to jeopardise any future relationship with Porsche but going public may well help those who aren't privy to this or other forums.

Dan

 

[Cyclemotor1958]

Hi Guys&Girls

I know we have mentioned this before but we thought we might mention it again.

This information only applies to owners who purchased their cars from Porsche main dealers and not soon after, the DTC code P242F came on and they were told they would have to pay for its replacement.

When the Porsche 111 point check is carried out, on the check sheet under section B, (vehicle documentation), it refers to a check on all emission control systems to be functional.

You would think by now, the carring out of this check is critical, bearing in mind the issues we have been having over the last 3 years.

From my understanding that before the internal memo came out the Dealers were using a simple ash level % check to determine if a regeneration could be carried out.

Level 4 64% to 85% ok to regenerate
Level 5 86% to 99% not ok to regenerate
Level 6 99% to 100% not ok to regenerate

When the internal memo came along it said in some cases the OPF can be recovered, therefore an OPF regeneration should be attempted to see if the OPF ash load is able to be reset. If this has already been attempted and the ash level didnt reset, then the OPF should be replaced.

What we have found over time, when asking for the pre sales GPF data that in most cases the oil ash % level was in level 5.

So why did these cars go out with the ash levels so high, when the Porsche 111 point check had been carried out

Surley checking the emission control system functionality
would include a check on the ash %.

Porsche have put this check on the 111 point check for a reason, its a shame that some Dealers are clearly not carring out their instructions to the letter.

So this explains why, when we have to do battle with the Dealer and Porsche they some times come back with a three way contribution offer.

If we see this in the future we will concentrate on the 111 point check and the pre sales GPF information, and move on the Dealers to sort this out.

If they feel that Porsche should be contacted thats up to them.

Afterall the contract of sale is between the customer and the Dealer.




Just a thought
Dave

 

[patersont718t]

Hi Guys&Girls

I know we have mentioned this before but we thought we might mention it again.

This information only applies to owners who purchased their cars from Porsche main dealers and not soon after, the DTC code P242F came on and they were told they would have to pay for its replacement.

When the Porsche 111 point check is carried out, on the check sheet under section B, (vehicle documentation), it refers to a check on all emission control systems to be functional.

You would think by now, the carring out of this check is critical, bearing in mind the issues we have been having over the last 3 years.

From my understanding that before the internal memo came out the Dealers were using a simple ash level % check to determine if a regeneration could be carried out.

Level 4 64% to 85% ok to regenerate
Level 5 86% to 99% not ok to regenerate
Level 6 99% to 100% not ok to regenerate

When the internal memo came along it said in some cases the OPF can be recovered, therefore an OPF regeneration should be attempted to see if the OPF ash load is able to be reset. If this has already been attempted and the ash level didnt reset, then the OPF should be replaced.

What we have found over time, when asking for the pre sales GPF data that in most cases the oil ash % level was in level 5.

So why did these cars go out with the ash levels so high, when the Porsche 111 point check had been carried out

Surley checking the emission control system functionality
would include a check on the ash %.

Porsche have put this check on the 111 point check for a reason, its a shame that some Dealers are clearly not carring out their instructions to the letter.

So this explains why, when we have to do battle with the Dealer and Porsche they some times come back with a three way contribution offer.

If we see this in the future we will concentrate on the 111 point check and the pre sales GPF information, and move on the Dealers to sort this out.

If they feel that Porsche should be contacted thats up to them.

Afterall the contract of sale is between the customer and the Dealer.




Just a thought
Dave

Hi Dave

as you are aware my car was at 67.02% when sold to me, the dealer didnt act on the level that was detected or tell me at the point of sale that this was a potential £10k time bomb as it certainly would have made me rethink the sale without a fix prior to purchase. As I’m collecting the data it clearly shows a major problem with this system and I don’t believe it’s a block GPF. I share my figures below as I continue my discussions with the OPC while I’m still waiting for the rest of the data. My advice to everyone that has car with GPF fitted start checking the fill levels

Date	Mileage	Ash oil load
16/09/2024	30676	67.06%
Purchase date 30/09/2024	30700	?
17/03/2025	34307	89.02%
31/03/2025	34500
04/04/2025	34526	80.39%
01/10/2025	37496
13/03/2026	38275	73.73%
13/03/2026	38275	82.75%
02/04/2026	38944	82.75%
13/04/2026	39099	82.75%
18/04/2026	39150	100.00%
21/04/2026	39212	100.00%

 

[Cyclemotor1958]

Hi Tony,

Brilliant information, this detail of information hidden from owners of these cars that have been told they need to find over 9K, is absolutely disgusting.

I worked in the motor trade for over 50 years and worked on the principle that you should treat your customers like your friends you can't go wrong.

Its stood me in good stead for all those years, its a pity that some of our Dealers don't.

If we get anymore of these cars with this fault and the Dealers continue to be unhelpful we will name and shame them.

This has to stop, the reason why I will not go to the press is why should we upset any more owners that have these vehicles.

Our main objective is to keep our owners in their cars by investigating and doing the research to fully understand whats happening to these cars.

We have proven beyond any doubt that replacing these GPF filters with a modified part is not fixing the issue.

We have other avenues to research and hopefully that research will get us in a position to finally get Porsche to have another look at this issue and fix it once and for all.

Porsche are dealing with these faulty cars on a case by case basis, and so are we.

Regards
Dave

 

[Cyclemotor1958]

Hi Guys&Girls
This is a video of a diesel car having a back pressure check, because the sensor is showing a faulty reading.

All the Dealers need to do is this same check, its not a big job, remove the front engine panel behind the seats, locate the differential pressure sensor.
Pull of the input pipe and connect the manometer.
Simple.

Dave

 

[Cyclemotor1958]

Hi Guys&Girls

Ive just watched a video on YouTube showing the technology on our Porsche cars, its absolutely incredible what our cars can do for us. Our owners can make their cars run and perform better with Vehicle Controls: Direct access to driving modes, climate controls, ambient lighting, and Advanced Driver Assistance Systems (ADAS).

On our cars we only need two things to improve them

1. The correct diagnosis of our GPF ash loading fault

2. An ash % load that we can trust

Dave

 

[patersont718t]

still a few data points to go, but please see below OPC provided data for GPF Oil/Ash Fill Levels and related sensors, once i have all the data i will be having another meeting with the OPC to understand what happens next, currant stance is the GPF is not covered under extended warranty. There seems to be quite a few Porsche owners facing this challenge.

If your car has been maintained, serviced, or repaired under warranty, Porsche will carry out a diagnostic check and automatically record the GFP data. My advice would be to request access to this data, as it is readily available, if you see the data early enough and its higher than you think it should be then you can get ahead of this.
It could also be extremely helpful for those currently dealing with this defect issue, as we continue to make the case to the brand that this is— and has been —a ticking £10k time bomb that isn’t covered by the extended warranty.
I’m sure @Cyclemotor1958 and can provide further insight on this.

 

[Cyclemotor1958]

Hi Tony,

Well, this is yet again brilliant information showing ash buildup over time on these cars, and its unbelievable that your Dealer supplied this information so very quickly.

We have been struggling to see this GPF information on our faulty cars for over three years, and yet its the owners information afterall.

One thing for sure is, when we get this information it confirms without doubt that these cars were built with this manufacturing defect.

It proves that at 17461 miles your car had 58% of oil ash measured with a differential pressure sensor reading of only 2.32 hPa.

Whats more amazing is that when your oil ash load got to 82%, the pressure was back again at 2.32 hPa.

You have probably seen that the reading 2.32 hPa is present eight times on your report, also 1.99 hPa appears 9 times.

I have seen the 2.32 hPa reading appearing many times on our faulty cars, its like a default reading, an algorithm calculation.

But we know its not correct to have such a low pressure reading on a GPF filter thats supposedly blocked with Ash.

We have collected lots of information over the last 3 years, which proves that these GPF filters are not blocked with Ash, they are not even blocked with soot.

The soot warning light doesn't even come on when the GPF filter is showing a 100% fill level and the Dealers are saying that the GPF needs replacing based on information sent from Porsche.

The soot light will never come on with differential pressure sensor readings that are so low.

We have seen information from Porsche that they believe a working GPF filters good pressure range is between 0.01 hPa to 100 hpa.

Just look at your differential pressure readings, your highest is 8.04 hPa that converts to 0.1166103411 PSI.

Atmospheric pressure in Harrogate at the moment is between 14.5 to 14.8 PSI, that means there is more pressure outside these cars when they are checked, than there is inside these filters.

The diagnosis of these filters is seriously flawed, without a back pressure check to confirm that the differential pressure sensor reading is correct, is complete nonsense.

The internal memo that was sent to our Porsche Dealers last March instructed the Technicians to check the functionality of the sensor.

It also confirmed a modified OPF filter was to be fitted in December 2019 going forward on our cars.

So this confirms that this fault was present in these cars durring the first year they came out, to bring out a new modified part in the first year of production would indicate that lots of cars were affected.

So Porsche and their Dealers were well aware of this fault, a clear case of a manufacturing defect present on these cars.

So this fault was dealt with under their manufacturing warranty on a case by case basis, no recall put out to fix this issue.

When you think about whats happened, and the fact that the modified filter hasn't fixed the cars that we have dealt with, makes this situation even worse.

How many cases of a faulty part does it take to make a manufacturer modify that part, it must be lots.

Thanks Tony, could you please thank your Dealer for giving you this data its very helpful.

Kind regards
Dave

 

[Scrounger]

Dave

If Porsche continue to ignore your requests to get in touch, what is your plan of action?

Dan

 

[718touring]

still a few data points to go, but please see below OPC provided data for GPF Oil/Ash Fill Levels and related sensors, once i have all the data i will be having another meeting with the OPC to understand what happens next, currant stance is the GPF is not covered under extended warranty. There seems to be quite a few Porsche owners facing this challenge.

If your car has been maintained, serviced, or repaired under warranty, Porsche will carry out a diagnostic check and automatically record the GFP data. My advice would be to request access to this data, as it is readily available, if you see the data early enough and its higher than you think it should be then you can get ahead of this.
It could also be extremely helpful for those currently dealing with this defect issue, as we continue to make the case to the brand that this is— and has been —a ticking £10k time bomb that isn’t covered by the extended warranty.
I’m sure @Cyclemotor1958 and can provide further insight on this.
View attachment 7564
View attachment 7576

I have noted that your car is Euro 6 AG the early standards before it changed to Euro 6 DG and the earliest example I have found is a car registered 24 July 2019 Which is still the 2019 model year.

do we have the actual build date of these cars, I’m guessing some of these early cars sat around a bit before being sold or pre registered to the dealer in view of the emissions changing from Euro 6 AG to Euro 6 DG.

 

[ianthow]

Just look at your differential pressure readings, your highest is 8.04 hPa that converts to 0.1166103411 PSI.

Atmospheric pressure in Harrogate at the moment is between 14.5 to 14.8 PSI, that means there is more pressure outside these cars when they are checked, than there is inside these filters.

Dave, you cannot say that there is more pressure outside the GPF than inside. The differential pressure is just that, the difference between the pressures upstream and downstream of the GPF, not the absolute pressure.

 

[Cyclemotor1958]

Morning Ian,

Yes your right of course I was being facetious, its unbelievable that we cannot get a Porsche Dealer to carry out this most basic test even when we offer to pay.

This refusal to do this test is a clear sign they know that no pressure is present when these GPF filters show the oil ash measured reading of 100%.

If we were to get the full GPF information for all our cars like Tony and others have managed to get, we will find that this oil ash % reading started to build up very early in the cars life.

This confirms why Porsche decided to modify these GPF filters in the first year of sale.

We need our 718 owners to ask for the GPF ash loading to be checked when their cars go into for service and repair. This would give us more information on what we are dealing with.

Tony said its a ticking time bomb, hes not wrong we just need to defuse it.

When the Dealers carry out a major service on Macan diesel they have to check the soot values, and if its high they carry out a regeneration its part of that service.

So checking our oil ash % value and reporting it to us, is not a big ask.

Another week has gone by and we have had no contact from Porsche regarding my cry for help to Porsche Stuttgart hopefully we might have some contact next week.

Fingers crossed
Dave

 

[Scrounger]

Dave, from my question yesterday:

'If Porsche continue to ignore your requests to get in touch, what is your plan of action?'

Dan

 

[Cyclemotor1958]

Hi Dan

I have a plan going forward but at the moment I can not discuss it, but hopefully its a good plan and if we are lucky it could be very beneficial to us all.

That's why I am asking 2019 718 owners to get their ASH levels checked, the more cars we can find with this fault the more it will help our plan.

We need to stop these cars being sold into the trade because of the excessive cost of this repair thats certainly not required.

Its up to the owners of these cars to help us push on, Ive said this before there is nothing out there that can equal the driving experience that these cars give you guys.

Its always been worth the fight to keep these cars with their owners.

Porsche and their Dealers need to support us and stop this issue being bigger than it should be.

Iam not an expert in software, but other models have had software changes along the way, why not your cars.

Regarding Porsche GB not getting in touch with us, if this proves to be the case, then they definitely don't care.

We have asked for help from the people who built these cars, the least we could expect is some help.

Dave

 

[BrianJ]

According to PP, Dr Wolfgang Porsche is still the Patron of our club - see https://en.wikipedia.org/wiki/Wolfgang_Porsche. You could write to him (a letter) at Porsche HQ. Might have an interesting reaction!

 

[Scrounger]

A tip, if you do plan to write to him (with a pen and paper) mark it 'Private and Confidential'. Only his secretary or he will open it

Dan

 

[Jagermeister36]

I’ve only just found this thread as I’m considering getting a 2019 2.0 718.
Can anyone summarise how common this fault is?