Fault P245900

[Cowood3223]

Hi, I used the van last weekend and on route to campsite EML came on, felt like the van wanted to regen but engine wasn’t up to temp and I was in slow moving traffic. I scanned van and got fault code P245900 - DPF regen frequency bank 1. I cleared the fault and the EML went off but the fault code returned. I kept the revs high on the motorway and the van ran ok. Got home and the van did a regen on the drive. Fault code now cleared but the soot level only dropped 1g is still at 24g. Does this sound right? I thought it should have dropped to around 8g after the regen

 

[manfrotto]

Yes - soot level DPF regen should continue until the soot level is down to around 8g
Hopefully it will do another proper regen when the soot level gets back up to 30g
What is the ash level?

 

[Cowood3223]

Thanks for replying, I will need to check ash level when I get back on Thursday.

 

[Dellmassive]

Post some screenshots of the app screen.

 

[Cowood3223]

Post some screenshots of the app screen.

Hi, just connect Vag DPF app don’t look good to me!

 

[Cowood3223]

Updated screenshot with the van ticking over on cold start.

 

[Cowood3223]

So I have driven the van a few times since last post on mix of journeys. The soot level seems to increase quickly between 15g - 25-28g at lower speeds. It does triggers regen and lower back to 8g and then resets but on slow roads around the Lake District it regen’d every 120mins even though only 30-35mile had been driven. Couple of examples from the DPF app.

Has anyone had this before? Wondering if a sensor is on it way out. The DPF has been cleaned by previous owner but assume no sensor have been replaced.

 

[mmi]

Has anyone had this before?

Similarities below?

Post in thread 'DPF Regen Until Soot Level >8g'

24 Feb 2026

why Regens might happen more often than not

Clogged DPF - indicated by Soot Mass Measured value being much higher than Soot Mass Calculated.

• mmi

• 

Please post VCDS engine blockmap files - please turn off the Stop/Start

1) ignition ON/engine off​

2) cold engine idling​

3) hot engine idling (after a minimum of 20+ minute journey​

​

---

How-to create a blockmap file:
Note: only VCDS HEX-V2 or HEX-NET cables have the capability

Ignition ON
[VCDS]
[Applications]
[Controller Channel Map]
- Single Controller Address = 01
- Login or security access code: Leave blank
- Function: Measuring values
- Output: CSV file
[Go]

---

The result files (.csv) are saved into directory C:\Ross-Tech\VCDS\Logs

 

[Cowood3223]

This is a screenshot of when the van was warm and idling. The soot mass calculated and measured are a similar amount unlike the other post. The DPF it self is clean in the tip with no soot present when I checked so I believe it’s working

 

[mmi]

The soot mass calculated and measured are a similar amount unlike the other post.

Apologies for inaccurate wording. I think your case is exactly the same - the calculated have "jumped up" to match the measured, hence they look now the same.
Please check thw post below - hopefully it explains better.

Post in thread 'DPF Regen every 50Km. Excessive Oil consumption CXEB 150kw'

13 Mar 2024

Hmmm.... looks like the log is an earlier one as it stops at 238907 km.

Thanks for sharing - very intriguing data!
Anyways, the same phenomena can be seen - e.g. below from 238579 km to 238763 km = 184 km, 2 hours.
Plotted the two soot mass parameters (calculated & measured) which are used by ECU to monitor and trigger DPF regeneration.

Normally "soot calculated" (blue) is the dominant one. Here it's a kind of opposite. As soon as "soot measured" reaches the DPF regeneration trigger level (30 grams) also the "calculated" is jumped to 30 grams which then forces the DPF regeneration to...

• mmi

• 

This is a screenshot of when the van was warm and idling.

Hmmm... looks to me more like a cold engine


Please post the engine blockmap files.

 

[Cowood3223]

Thank you for the info, I will post the block maps over the weekend.

 

[Cowood3223]

Hi @mmi

I've attached the blockmap files as requested.

Whilst I was out in the van getting up to temp, I monitored the VAG DPF app and notice the soot mass measured was rising twice speed as the soot mass calculated. Once soot mass measured hit 30g the soot mass calculated jumped from 14.55g to 30g and regen started.

When the regen was taking place the soot mass measured dropped quickly stopping at 4g whilst the soot mass calculated dropped steadily down to 9g and then the regen completed.

Could this be a sensor on it way out rather than dpf damaged or blockage? I have attached the export from the VAG DPF app which shows the jump.

 

[Cowood3223]

Also looking at the DPF differential pressure it seems very high and erratic jumping from 83 hpa to 462 hpa in the space of 6 second whilst the soot measure were around 18g and soot calculated 13g.