ECU Fault Codes

[alan@mc]

Hi just had the first service at an independent VW specialist
They picked up the following fault codes:
P2A0000
P2EAF00
P157000
P204B00
I’m informed that the presence of the fault codes will prevent a Regen
Contacted WV who can’t investigate until mid Feb at the earliest which is far from ideal for me but can anybody throw any light on the most likely issue as I really need to use my van everyday
Cheers in advance

 

[Salty Spuds]

Are they persistent faults I.e. live & current, or are they historical faults recorded by the ECU. Did the garage try to clear them? If so, did they clear or are they currently showing?

 

[alan@mc]

The garage advised me to book in with VW for further investigation

 

[Salty Spuds]

The garage advised me to book in with VW for further investigation

I’d be trying to find a forum member with VCDS near you & buying them a beer. Search the forum for “VCDS users”

 

[mmi]

Any warning lights on dash?
What's the engine code - it's on sticker under dash by steering column? Presumably something like DNAA, DNAB, DMZA...

 

[alan@mc]

Are they persistent faults I.e. live & current, or are they historical faults recorded by the ECU. Did the garage try to clear them? If so, did they clear or are they currently showing?

The garage have a really good reputation so I took their advice, I guess if they thought it was appropriate to reset the fault codes they would have done, I’ve not felt it do a DPF regen for a good while although I don’t tend to do too many short trips

 

[alan@mc]

Any warning lights on dash?
What's the engine code - it's on sticker under dash by steering column? Presumably something like DNAA, DNAB, DMZA...

No warning lights will check that sticker in next ten mins thanks

 

[alan@mc]

Any warning lights on dash?
What's the engine code - it's on sticker under dash by steering column? Presumably something like DNAA, DNAB, DMZA...

DNAA N2184945025

 

[Salty Spuds]

The garage have a really good reputation so I took their advice, I guess if they thought it was appropriate to reset the fault codes they would have done, I’ve not felt it do a DPF regen for a good while although I don’t tend to do too many short trips

If you take it to a dealer, they’ll just clear the faults & take it for a run & see if they re-occur. Faults come & go for a variety of reasons, not necessarily for the right ones.

 

[alan@mc]

If you take it to a dealer, they’ll just clear the faults & take it for a run & see if they re-occur. Faults come & go for a variety of reasons, not necessarily for the right ones.

Fair point, just waiting for nearly 2 months for an appointment isn’t ideal but hey ho!

 

[Salty Spuds]

Fair point, just waiting for nearly 2 months for an appointment isn’t ideal but hey ho!

TBH, if the faults are genuine & current, you’ll break down before the 2 months is up. This is why a VCDS scan would be more useful. It would tell you when the faults occurred & if they were currently present.

 

[alan@mc]

Ok thanks for the advice I’ll try and get something sorted

 

[mmi]

DNAA N2184945025

Thanks. The engine is one of the new generation engines in T6.1 thus T6Forum has very little "experience" about these so far

No warning lights

No warning lights means that the faults need no immediate attention. Which means your listing is most likely just an archive of past glitches which never passed alarm threshold.

Without warning lights on dash I wouldn't worry about it.

just waiting for nearly 2 months for an appointment isn’t ideal but hey ho!

Well, faults without reoccurence will be archived in the ECU before the appointment - thus won't be "reachable" any more with VW tools. Typically faults will be "archived" in less than 1000 miles.

 

[alan@mc]

Thanks. The engine is one of the new generation engines in T6.1 thus T6Forum has very little "experience" about these so far


No warning lights means that the faults need no immediate attention. Which means your listing is most likely just an archive of past glitches which never passed alarm threshold.

Without warning lights on dash I wouldn't worry about it.


Well, faults without reoccurence will be archived in the ECU before the appointment - thus won't be "reachable" any more with VW tools. Typically faults will be "archived" in less than 1000 miles.

I guess the interesting thing is will the DPF regen resolve itself if the fault codes are archived? It’s definitely not run regeneration and hasn’t for a good few months / miles so
Long term it will deteriorate won’t it?

 

[Salty Spuds]

I guess the interesting thing is will the DPF regen resolve itself if the fault codes are archived? It’s definitely not run regeneration and hasn’t for a good few months / miles so
Long term it will deteriorate won’t it?

How do you know it hasn’t done a regen? If the DPF was clogged, you’d be in limp mode with the warning light on.

 

[mmi]

It’s definitely not run regeneration and hasn’t for a good few months / miles so

How do know it hasn't done the DPF regeneration? It's very difficult to notice the regeneration during "normal" driving.

Long term it will deteriorate won’t it?

Normally DPF regeneration takes place every 100-200 miles (depending on engine load, cold starts, etc). If something would inhibit it, a special warning light would illuminate on dash. This would happen after approx. 50 miles after passing the "planned" regeneration. Ignoring that would clog the DPF in next 100 or so miles.

 

[alan@mc]

When it used to regen I’d note the idle speed would increase slightly and you could often smell it when you parked up with the cooling fan still running but I’ll take your advice that it’s running during normal driving

 

[Salty Spuds]

I guess the interesting thing is will the DPF regen resolve itself if the fault codes are archived? It’s definitely not run regeneration and hasn’t for a good few months / miles so
Long term it will deteriorate won’t it?

I think you’re getting confused with how fault codes work. Just because there’s a “stored” code, doesn’t mean to say that the fault is still there. This is why I was asking about persistent faults earlier. The faults that caused the codes may have cleared themselves, but the codes are still stored in the ECU until they are cleared at a later date. The faults that you are seeing may have occurred momentarily thousands of miles ago, it may well be that the van is perfectly healthy with no current faults. You’ve only been given half the story by your garage. Without a full scan, showing times & mileage when the faults were logged, we are guessing.

 

[alan@mc]

I think you’re getting confused with how fault codes work. Just because there’s a “stored” code, doesn’t mean to say that the fault is still there. This is why I was asking about persistent faults earlier. The faults that caused the codes may have cleared themselves, but the codes are still stored in the ECU until they are cleared at a later date. The faults that you are seeing may have occurred momentarily thousands of miles ago, it may well be that the van is perfectly healthy with no current faults. You’ve only been given half the story by your garage. Without a full scan, showing times & mileage when the faults were logged, we are guessing.

Yep fair point I’ve taken what I’ve been told on face value, as I say it’s a trusted VW specialist so I had no reason to doubt what I was told, it’s booked in at VW agent so I guess I’ll know more in February cheers for the advice