Engine Mgmt & AdBlue Fault: Car at Dealership.

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
Hi All

Just thought I'd share a recent experience with you all as my '2016 B9 Avant Quattro TDI' is currently at my Audi dealership having some works done.

Generally and touch wood its been solid and a joy to own (for nearly 2 years) I'd say that this is the first real issue I've had to take it in get resolved, and well worth the Extended Warranty I've paid for.
  • Anyway .. Topped up diesel Saturday, immediate Amber Engine mgmt light on way home, and eventually an AdBlue Fault message just as I pull into my road: Image attached.
  • Audi Roadside technician called yesterday morning to diagnose fault and codes, all point to issues with the AdBlue Control unit (Fault codes P208D, P21CA, P208c) referred to dealership.
  • Booked into local Audi Dealership the very same day and they have the part on order to be replaced tomorrow morning - importantly covered by the warranty, as you'd expect but always nice to be told :)
Anyway just thought i'd share my experiences .. looking forward to having her back.

Will let you know how things progress. Cheers,
 

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Mkay315

Registered User
Hi All

Just thought I'd share a recent experience with you all as my '2016 B9 Avant Quattro TDI' is currently at my Audi dealership having some works done.

Generally and touch wood its been solid and a joy to own (for nearly 2 years) I'd say that this is the first real issue I've had to take it in get resolved, and well worth the Extended Warranty I've paid for.
  • Anyway .. Topped up diesel Saturday, immediate Amber Engine mgmt light on way home, and eventually an AdBlue Fault message just as I pull into my road: Image attached.
  • Audi Roadside technician called yesterday morning to diagnose fault and codes, all point to issues with the AdBlue Control unit (Fault codes P208D, P21CA, P208c) referred to dealership.
  • Booked into local Audi Dealership the very same day and they have the part on order to be replaced tomorrow morning - importantly covered by the warranty, as you'd expect but always nice to be told :)
Anyway just thought i'd share my experiences .. looking forward to having her back.

Will let you know how things progress. Cheers,
How much do you pay for your warranty if you don't mind me asking?
 

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
How much do you pay for your warranty if you don't mind me asking?

not at all, I pay monthly and opted for the Audi 'All Component' cover, is about £40 a month for 12 months.

There is a diluted option and I'm sure paying off in one go would be cheaper.

For peace of mind I'm cool with that.
 

Mkay315

Registered User
not at all, I pay monthly and opted for the Audi 'All Component' cover, is about £40 a month for 12 months.

There is a diluted option and I'm sure paying off in one go would be cheaper.

For peace of mind I'm cool with that.
Oh nice. I am thinking of getting an A4 very soon. It would be a good upgrade from my MK7 VW golf. Would you recommend for me to get the car from an Audi dealership or from an Independent dealer?
 

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
Oh nice. I am thinking of getting an A4 very soon. It would be a good upgrade from my MK7 VW golf. Would you recommend for me to get the car from an Audi dealership or from an Independent dealer?

That's your call mate, whatever I say someone else will have another opinion.

I guess it depends of price of the car, dealer reputation and warranty quality.
 

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
Quick update on this, I picked up the car last weds so the dealership managed to fix the issue pretty quickly.

Apparently the AdBlue Control unit was indeed faulty and therefore needed to be replaced. The service guy informed me it wouldve been a £450 part and ultimately a £600-£700 bill if I'd have had to pay. kinda what I expected.

anyway all sorted now :)
 

Mkay315

Registered User
Quick update on this, I picked up the car last weds so the dealership managed to fix the issue pretty quickly.

Apparently the AdBlue Control unit was indeed faulty and therefore needed to be replaced. The service guy informed me it wouldve been a £450 part and ultimately a £600-£700 bill if I'd have had to pay. kinda what I expected.

anyway all sorted now :)
Wonderful news. Hopefully it's all smooth now
 

WesT-gefül

Well-Known Member
Bronze Supporter
Quick update on this, I picked up the car last weds so the dealership managed to fix the issue pretty quickly.

Apparently the AdBlue Control unit was indeed faulty and therefore needed to be replaced. The service guy informed me it wouldve been a £450 part and ultimately a £600-£700 bill if I'd have had to pay. kinda what I expected.

anyway all sorted now :)

Glad you got sorted. More people need to have this checked. Saved a bundle.
 

Ioan Furdui

2016 A4 Avant B9 190 Quattro S-Line
Hi All

Just thought I'd share a recent experience with you all as my '2016 B9 Avant Quattro TDI' is currently at my Audi dealership having some works done.

Generally and touch wood its been solid and a joy to own (for nearly 2 years) I'd say that this is the first real issue I've had to take it in get resolved, and well worth the Extended Warranty I've paid for.
  • Anyway .. Topped up diesel Saturday, immediate Amber Engine mgmt light on way home, and eventually an AdBlue Fault message just as I pull into my road: Image attached.
  • Audi Roadside technician called yesterday morning to diagnose fault and codes, all point to issues with the AdBlue Control unit (Fault codes P208D, P21CA, P208c) referred to dealership.
  • Booked into local Audi Dealership the very same day and they have the part on order to be replaced tomorrow morning - importantly covered by the warranty, as you'd expect but always nice to be told :)
Anyway just thought i'd share my experiences .. looking forward to having her back.

Will let you know how things progress. Cheers,
Just got engine light on today, after yesterday i top up ad blue. To be honest i top up with ad blue from the petrol station, but is not the first time i am doing that.
I read the faults, and got me just one P21CA.
I mention i do not have warranty anymore, just ended in november last year.
 

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
Just got engine light on today, after yesterday i top up ad blue. To be honest i top up with ad blue from the petrol station, but is not the first time i am doing that.
I read the faults, and got me just one P21CA.
I mention i do not have warranty anymore, just ended in november last year.
Sounds like it could possibly be the same issue then based on the symptom and the fault code.

let us know how things go.
 

Ioan Furdui

2016 A4 Avant B9 190 Quattro S-Line
Sounds like it could possibly be the same issue then based on the symptom and the fault code.

let us know how things go.
Yes, didn't drive the car anymore, on the way to a service got the same fault on
Sounds like it could possibly be the same issue then based on the symptom and the fault code.

let us know how things go.
Yes, i didn't drive the car anymore, and today on the way to a service, i got the same fault in my dash.
Let's see what the service saying.
 

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BigAardvaark

Registered User
This has happened to me both times I let the adblue warning get below 1000 miles (might have been closer to 800 miles?), engine light on, adblue fault. Put adblue in and both cleared themselves very shortly after.
 

ripo

New Member
Yes, didn't drive the car anymore, on the way to a service got the same fault on

Yes, i didn't drive the car anymore, and today on the way to a service, i got the same fault in my dash.
Let's see what the service saying.

Hi, I just got same fault on mine. Did you get it resolved?

P21CA. "Low voltage supply reductant control module J880". It also shows 0.00 voltage terminal 30A. I checked J880 module connector and both terminal 30s have 12v voltage. CEL is on and also this adblue fault. I am thinking that module is faulty
 

Ioan Furdui

2016 A4 Avant B9 190 Quattro S-Line
Hi, I just got same fault on mine. Did you get it resolved?

P21CA. "Low voltage supply reductant control module J880". It also shows 0.00 voltage terminal 30A. I checked J880 module connector and both terminal 30s have 12v voltage. CEL is on and also this adblue fault. I am thinking that module is faulty
Not yet, one service told me is the adblue pump faulty and have to be replaced. But i will try another service to see if is the same thing they saying.
As far as i read online, you are right, p21ca is low voltage control module, nothing to have with the pump.
Will look soon for a second opinion.
 

Ioan Furdui

2016 A4 Avant B9 190 Quattro S-Line
Hi, I just got same fault on mine. Did you get it resolved?

P21CA. "Low voltage supply reductant control module J880". It also shows 0.00 voltage terminal 30A. I checked J880 module connector and both terminal 30s have 12v voltage. CEL is on and also this adblue fault. I am thinking that module is faulty
Have you resolved it yet?
Mine still not resolved yet, no free time at this moment. Looking forward next week maybe.
 

ripo

New Member
Have you resolved it yet?
Mine still not resolved yet, no free time at this moment. Looking forward next week maybe.
I am waiting new reductant control module to arrive during next week. I am pretty sure that control module is faulty.

New module from local dealer is +500 euros and I have heard that they may change the module for upgraded version and upgraded version of control module needs new upgraded tank and pump assembly: 2000 euros total with labor. I ordered used module (26k miles) of same version that I had so I hope it will solve the problem for now. Used part was only 90 euros including shipping.

If this doesn't solve the problem then I'll take it to local dealer and pay whatever I need to get it fixed..
 

ripo

New Member
Have you resolved it yet?
Mine still not resolved yet, no free time at this moment. Looking forward next week maybe.

Good news! New module arrived today and I replaced the old one with it and yellow adblue s*it was immidiately gone from instrument cluster. CEL was still on and needed to clear with VCDS. Checked the adblue fill level with VCDS and it showed 98% which I believe was true because I had filled 20 litres of adblue after problem started so I did not carry out adblue adaptation
 

Ioan Furdui

2016 A4 Avant B9 190 Quattro S-Line
Good news! New module arrived today and I replaced the old one with it and yellow adblue s*it was immidiately gone from instrument cluster. CEL was still on and needed to clear with VCDS. Checked the adblue fill level with VCDS and it showed 98% which I believe was true because I had filled 20 litres of adblue after problem started so I did not carry out adblue adaptation
Great news. Tuesday my module is coming aswell. I hope that will resolve the problem.
How much did you paid for module?
 

gregpot2000

Registered User
No sooner than a few days after reading this thread I have the same issue

Booked in with Audi in a couple of weeks, going to run it for a few miles in the meantime and hope it clears itself, as I have seen reports of happening before.

I've gone from doing 1.5k miles per month to less than 100 a month in the last year for obvious reasons, so the countdown is no great concern to me. I have the miles and time to experiment.

I wonder if barely using the car has caused it, as ad blue can crystallise over time? Brimmed the tank, and hoping it will clear itself before the booking

Sent from my SM-G998B using Tapatalk
 

BigAardvaark

Registered User
I spoke too soon in my post earlier in this thread, it DID clear itself but came back, extended warranty covered in full, new control unit, etc. Chap at Warrington Audi reckoned it would have been an approx £1500 bill. Warranty paid for itself in one claim.
 

Jonfun

2016 A4 Avant B9 190 Quattro S-Line
I spoke too soon in my post earlier in this thread, it DID clear itself but came back, extended warranty covered in full, new control unit, etc. Chap at Warrington Audi reckoned it would have been an approx £1500 bill. Warranty paid for itself in one claim.
Exactly what happened with me fella!
 
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