S80 Dpf issues
 

Having problems with 2011 D3 S80.
Soot filter full message and engine system service required.
Plugged into Vdash and getting
P2454 and p0138 errors
Changed the dpf pressure sensor and faults still won't clear.
No mot so cannot take it for a run on the motorway.

check the pipes to the sensor are good and have no leaks. do a forced regen with vida im not sure if you can do this with vdash

If you do a forced regen, make sure you change the engine oil and oil filter. Diesel can dilute into the oil during a forced regen, you don’t want that (hence the requirement for an oil change).

I am aware that you cannot do it at the moment because No MOT, but will still answer, because it may help you. This was my answer to someone else with the similar problem, and also the procedure that helped me solve my problem with soot going up and down rapidly and regens happening to frequently from July 2023 to November 2023. Here is the copy & paste of my answer (Don't have time to re-edit now).

Yes, doing the regen on the motorway for 15-16 minutes between 3500-3900 rpms in 3rd gear worked for me. Did it with cruise control on. And when finished, make sure to drive for another 20 minutes fast but normally in 5th or 6th gear at 2000-2200 rpms to cool the engine and let the possible small amount of fuel which may go into oil evaporate (and of course slow in the end before powering off the engine). All that requires planning to catch the start of the regen on the highway. And also MAKE SURE to follow your car coolant and oil TEMPERATURES with diagnostics while doing the regen as described. Did it twice since last November 2023, and the 3rd regen is going to happen in a couple of days (now in March 2024). It will be 6.000 kms since November and everything was fine. Soot accumulation was perfect and slow. In winter my car does the active regen exactly at 2.000 kms driven, because the soot does not reach 25,7 g threshold which starts the regen usually. Probably in winter if it's not too cold we get better combustion cause dense air has more oxygen...

Let me repeat - WARNING - do it at your own risk - and DON'T do it without live diagnostics which follows the coolant and oil TEMPERATURES!!!

My coolant temperature barely crossed 90-91 C and oil reached max at 109-110 C.

I did it twice that way and all was perfect for my car in the last 6.000 kms (since Nov 2023).

Also make sure to use some premium quality diesel fuel. I got Shell V-Power diesel. Did fill it up few times with lower quality diesel and it could have made a contribution to the problem I had before.

I've chosen to try that instead of Forced regen when idling and very pleased about avoiding the engine idling at 4.000 rpms for half an hour...

When 3rd regen comes in a couple of days I will not do it that way, but "normally" in 2000-2500 rpm range, as I believe twice was enough...for now.

Car is now at 260.000 kms and going great.

Please report back if you do it.

I'll be doing this to my dad's S60 D3, it's very nearly hitting 25g and by the time I take it back to him (I do his maintenance) I'll be on the motorway doing exactly what you'd described :cool:

Just wanted to point out, that as you had/have an unresolved P2454 error. You have no way of knowing if the soot filter is actually full.

From what I understand from your original post, you have not been able to clear the pressure sensor fault?

When the pressure sensor is faulty, no regen will occur and the soot level will also be inaccurate. You have to address any sensor issues first before considering anything else.

P2454 is a "circuit low" code, which usually means the ECU is reading back a lower than expected voltage from the sensor, or there is a short to ground.

You can verify this is the case in live data. Compare the sensor voltage with the sensor connected/disconnected. If you are not getting a change, you may have a wiring fault.

you do not need to do revs on the motorway, the system does regenerations easily around your daily driving routines, just 50 mph for about 20 mins is all that is needed unless it is a icy cold day . do you do very short journeys mainly ?
have you the full 7 digit fault codes ?

Yes, of course you do it that way when everything works fine and regens happen every 1000-1200 kms as it is said in the owner's manual.

I do not have short trips, I do motorway 85% of the time every working day.

But, what do you do when regens start to happen every 400-600 kms and soot level wildly goes up and down? And all sensors are all right?

After doing the revs once, it's 100% back to no problems at all.

As I mentioned, maybe the lower quality fuel was to blame. But, the revs with better fuel fixed it.

Of course it will not help if there is a malfunction somewhere...

You might need revs but no one else does when the system is working properly, and it's not as the fault codes prove. You are doing very favourable driving if if you are on the motorway 85% of the time. What are the FULL volvo fault codes ?

The only DTC I got was:

ECM-P2A0036 O2 Circuit Range / Performance (Bank 1, Sensor 1).
FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures.
Signal frequency too low.

Then I replaced the O2 sensor and it didn't help. Problems were the same.

Later I have read somewhere (maybe in VIDA, I cannot remember now) that this DTC does not mean that the O2 sensor is faulty, but it points to some other component to be faulty. VIDA says fot that DTC "The signal from the heated oxygen sensor is incorrect." And it is incorrect because something else is broken and O2 sensor detects wrong reading because something else is broken.... Oh, yes now I remember I also had significant higher fuel consumption when the egine was cold, for first 10 kms...

All in all high revs fixed it and everything is fine since the high revs regen in November - 6.000 kms ago...

(Now solved) Problem described here: https://www.volvoforums.org.uk/showthread.php?t=335709

Thanks Clan.