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1.5 HDi K9 cooling fan staying on, could be regen issue?
#1
Hi all,

My K9 Hdi's cooling fan is giving some strange behaviour and i am thinking it may be a regen issue or the resistor. The last couple of weeks i have noticed the cooling fan coming on more often and staying on longer. I am kind of thinking it is failing to regen correctly due to the behaviour it presents.

It has 108K on it and not had any issues with lights or funny noises so far. However it appears to start a regen cycle, evident due to exhaust smell, cooling fan and a change in sound of the engine then gets weird from there. Now these are things i have all grown used to with this and my last B9 model except the excessive cooling fan running.

The car will be doing a regen and then after a while of driving i stop, no smell evident from the exhaust but cooling fan still running. Normally not a worry but this is after 30 min sometimes 20 miles of driving so jump in and drive again some more and its still running. Finally only stops when the car is switched off for 10 minutes, restart and away she goes no problem until the next time. Had it since brand new and never noticed this new behaviour until a couple of weeks ago.

It is making me sway with a couple of options but would be interested if anyone has seen this before? My first option is that there is a fault with the cooling fan and it is not deactivating after a regen is completed. The second is that the DPF is having issues and is failing to complete a full regen cycle correctly. If i lift the bonnet while the regen appears to be happening the engine does not seem to be very hot either. In comparison to my B9 when you opened the bonnet you were met with a heat that could cook an egg coming from the engine while a cycle was occuring.

Looks like i will need to take to the garage AGAIN and see if they can maybe dig in to the issue for me. The car has been from glasgow to preston and back, glasgow to whitehaven and back an then glasgow to campbeltown today so i would say this would be enough long runs to have it regen and sort itself out. This would depend on how often it regens but never noticed this before. It appears to being doing it more often so not sure if it is because the efficiency of the DPF is going and it needs to try a regen cycle more often. More often is something that would not bother me in itself but it is the cooling fans staying on until the engine is switched off that is bothering me and makes me feel like the regeneration cycles are failing to complete. This along with the lack of smell coming from the exhaust would suggest it is either failing to get to the end of the cycle or it is finishing but the fans does not disengage itself.

Thanks in advance

Ian
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#2
Hi. It could be that the regen is not complete when you stop the engine. The fan in mine was on for a long time after stopping the engine. Finally I installed a led that tells me when it's regenerating and I haven't had the fan issue since then.
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#3
(14-01-2023, 08:05 PM)Mikelin Wrote:  Hi. It could be that the regen is not complete when you stop the engine. The fan in mine was on for a long time after stopping the engine. Finally I installed a led that tells me when it's regenerating and I haven't had the fan issue since then.

Hi Mikelin,

Yes it is a possibility i have considered but it is doing it far too often to be that. Either that or the car is having regen/DPF issues but there appears to be no faults logged for this. As i am lead to believe the regen cycle only starts if the vehicle is at operating temp. Today it came on around 80 degrees but normally operational temperature is around 91/92 degrees. The cooling fan will stay on for an hour easy if i leave it probably longer but i don't want to risk burning the bearing out so i tun it off and wait until it stops before starting the car again. Also when it is on i have observed engine revs and it will tick over at idle at 750/800 rpm. I also believe that during a regen idle speed increases to around 1000rpm.

I am starting to think it may be more an issue with the fan resistor which was faulty on my two previous B9's and from reading it appears may be of similar issue in the K9 also. I am going to get it in to the garage and they can check the switch to see what the resistance is doing on it.

Cheers
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#4
Please, keep us posted.

Cheers
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#5
Cooling fan system has been checked and is functioning correctly it appears we are looking at a DPF issue with code P242F being returned. Garage recommends most likely corrective action to be a DPF replacement.

Also mentioned was the PCM as in some rare cases it can be this at fault and it sends incorrect data to the ECU. Is there any way to check the PCM in these cars and I do not want to put a DPF in to then find it is a PCM issue???

Had this same code on my 2016 a few years back and replacing the DPF back then corrected the issue but dont remember the PCM beig mentioned at that time.

Currently no service light or EML on just the stored code itself.

Currently the DPF appears to be around £1300-£1400 to buy and is only availble for citroen so dont want to be fitting one to find the PCM is at fault. Garage can clean it but has said it only works about 50% of the time and of that 50% that do work they usually need a DPF in the not to distant future anyway.

If anyone has any experience here it would be appreciated.

Thanks
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#6
Also the code P242F is accompanied by -97 at the end not sure if this makes a difference but there is no results returned online when looking for it just for P242F itself?
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#7
PCM? Can you explain the abbreviation, it's not one I've seen used in Citroen documents. P codes are engine ECU codes. Powertrain.

Seems way too new a vehicle to need a DPF already? What mileage is it on? Can't find P0242 in the official list bit it could be a new model code. Mind you DPF have been around for 13 years so the codes will be well set by now. Who read this code, and what with, Diagbox?

Every reader, even pro ones, find daft codes on there that Citroen don't even use. I'm finding this myself now all the time.
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#8
(13-02-2023, 06:27 PM)Zion Wrote:  PCM? Can you explain the abbreviation, it's not one I've seen used in Citroen documents. P codes are engine ECU codes. Powertrain.

Seems way too new a vehicle to need a DPF already? What mileage is it on? Can't find P0242 in the official list bit it could be a new model code. Mind you DPF have been around for 13 years so the codes will be well set by now. Who read this code, and what with,  Diagbox?

Every reader, even pro ones, find daft codes on there that Citroen don't even use. I'm finding this myself now all the time.

Hi Zion,

Thanks for replying to my post. Yes so the PCM as garage has explained it is the Powertrain Control Module. They have said that there is mention in the system they use about the control module, on rare ocassions, sending faulty messages to the ECU. Spoke to my local citroen dealership and he says there is no PCM as such because it is now a complete unit included with the ECU.

However i refer to a post i made nearly 4 years ago that can be found here 

https://www.berlingoforum.com/thread-182...ight=P242F

At that time my 2016 B9 was reporting the same fault code of P242F, replacement was advised and this solved the issue. The new code is the same but with another two digits at the end so it is P242F-97 and is reported from a Delphi diagnositcs machine. This code according to the Delphi comes out as UPPER LIMIT FOR ADDITIVE IN PARTICULATE FILTER and replacement has been advised. There is no service light/message or EML with it so they are puzzled as it should have the service light appearing with it they say.

I provided the code to the local dealership and they have also said most likely needs a filter but they would need to look at it first to confirm. If the job is required they have quoted me £1650 for supply and fit as aftermarket units are not available yet for this type of filter.

With regards to mileage, it is another taxi and currently has 113K on it but is used on airport transfers 20+ miles normally so always gets a good run out.

This quote is smarting a bit since i put an AdBlue tank on it only 9 weeks ago which cost me a grand, so i would rather not be paying out £1650 again so soon after but it is what it is i suppose.

Noticed this initial problem because the cooling fans wa staying on as described in previous posts and would do so for an hour or until i turned off the ignition and let it sit for 10 min. Cooling fan function and the cooling fan resistor have been checked and they have said it is operating as it should. It is in every 10k for oil and servicing and the last time it was in at 103K there was no fault codes but now it is presenting P242F. So they believe the fan staying on is now related to whatever is going on with the DPF and may be due to some kind of failed regen loop. When the fan comes on fuel consumption increases to around 53mpg as if it is doing or trying to do a regen and after the fan goes off it returns to normal consumption around 58.7mpg.

So we are kind of thinking that it is only a matter of time until the service indicator notifies us of an issue but i dont really want to leave it any longer incase it impacts other systems on the car. Most likely will be going in somewhere at the start of next week.

Cheers
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#9
Car finally been to Citroen and plugged in for diagnosis. DPF fault code was found and Citroen recommend replacement as filter is beyond its servicable life (was replaced today at cost of £1650 supplied and fitted).

The cooling fan was actualy unrelated to the DPF or regeneration cycle. Fault code present was showing the number 1 relay was non existent. Upon checking the relay and resistor were both gubbed (replaced at a cost of £279).
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#10
Ouch, ouch and ouch.
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