Reductant/adblue tank issues: 2015 Passat B8

[jez]

Hi,

I have a Ross-Tech Hex-Can connector to read electronic codes and prime my TDI fuel pump.
My current car is a 2015 Passat TDI, type-B8 (different from the 2014 Passat)

It recently got cold here in Canada.
During this time my dashboard screen indicated to refill the Adblue tank.
I purchased more fluid and refilled the tank. The fluid was cold (-25 Celsius). There was about 50 km left on the countdown. None of this was ideal.
My car does not recognize the tank level changed, so I need to reset the level sensor. Hopefully now there is no mechanical problem.


--- How likely is it that fluid froze and damaged the plastic SCR tank, or could a low fluid level burn out the injector/pump or tank heater?
--- I am seeking procedures to follow for checking/reseting the SCR system, using VCDS.

Please provide advice. I can post my scans if required.

Thanks,
Jeremy

 

[2kaa52]

Pls post a Autoscan

 

[Uwe]

The fluid was cold (-25 Celsius).

That's slightly below its freezing point!

How likely is it that fluid froze and damaged the plastic SCR tank,

Those tanks should be designed to accommodate the inevitable expansion when DEF freezes.

-Uwe-

PS: Please Get Verified.

 

[jez]

I filled out my verification info online last week

 

[SaVAGeSoot]

How about that scan?

 

[Uwe]

I filled out my verification info online last week

I don't see it. You joined the forum last week, and you provided a serial number, but that interface has never been registered with us.

-Uwe-

 

[jez]

Would

 

[jez]

Hi. Thanks for helping. I will check into why my Hex-can cable (which I ordered directly from Ross-Tech) is "not registered".
I used it to do an initial scan. Then I screwed up by deleting the codes. I then did another scan. Here they both are (I removed the unnecessary sections).


FIRST SCAN Saturday,02,March,2024,21:20:53:48870

VCDS -- Windows Based VAG/VAS Emulator Running on Windows Vista x64
VCDS Version: 23.11.0.0
Data version: 20240205 DS351.0


01-Engine -- Status: Malfunction 0010

-------------------------------------------------------------------------------

Address 01: Engine (J623-CVCA) Labels:. 04L-907-309-V1.clb
Part No SW: 04L 997 016 C HW: 04L 907 309 K
Component: R4 2.0l TDI H20 9467
Revision: 8AH20--- CVN: 121EE41138D3FF82B866C2AD
Coding: 01190012832410081000
Shop #: WSC 91599 999 00000
ASAM Dataset: EV_ECM20TDI01104L997016C 004002
ROD: EV_ECM20TDI01104L997016C.rod
VCID: 33651F329A8B8E090E-8066
VINID: 0669D39874430164C01022020454401E67



12 Faults Found:

25730 - Control Module for Reductant Quality
U02A2 00 [01100000] - No Communications
Intermittent - Not Confirmed - Tested Since Memory Clear

17158 - Implausible Data Received from ESP Control Module
U0416 00 [00100000] - -
Intermittent - Not Confirmed - Tested Since Memory Clear

22589 - Reductant Tank Temperature Sensor
P205B 00 [01100000] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear

22585 - Reductant Level Sensor
P203B 00 [01100000] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear

7917 - Glow Plug Control Module
P064C 00 [00100000] - -
Intermittent - Not Confirmed - Tested Since Memory Clear

7924 - Glow Plug Control Module
P064C 00 [00100000] - -
Intermittent - Not Confirmed - Tested Since Memory Clear

9645 - Reductant
P20E8 00 [11101101] - Pressure too Low
MIL ON - Confirmed - Tested Since Memory Clear

Freeze Frame:
Fault Priority: 2
Fault Frequency: 8

Mileage: 156907 km
Date: 2024.01.20
Time: 14:51:57



Engine RPM: 1497.00 /min
Normed load value: 85.1 %
Vehicle speed: 57 km/h

Coolant temperature: 78 °C
Intake air temperature: 54 °C
Ambient air pressure: 920 mbar

Voltage terminal 30: 14.000 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: -11.5 °C
Reducing agent pump module relative press.: calculated: 5609 hPa
Reducing agent fill level sensor: act. value: 0.0 mm
Sensor for reducing agent tank temperature: temperature: -9.6 °C
Reducing agent system pressurization release conditions-Bits 0-7: 0
Reducing agent system pressurization release conditions-Bits 0-7: 255
Reducing agent system: current status: COSCR_PURGE
Reducing agent system: current status-Test_Program_SCR Con State 01 UBYTE: 8

21467 - Mass Airflow Sensor 1
P00BC 00 [01100000] - Airflow too Low
Intermittent - Not Confirmed - Tested Since Memory Clear

22566 - Reductant Injection System
P249C 00 [01100101] - Excessive Time to Enter Closed Loop
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 157981 km
Date: 2024.02.27
Time: 20:17:17

Engine RPM: 2098.50 /min
Normed load value: 57.3 %
Vehicle speed: 55 km/h
Coolant temperature: 86 °C
Intake air temperature: 51 °C
Ambient air pressure: 930 mbar
Voltage terminal 30: 14.500 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: -19.5 °C
Reducing agent pump module relative press.: calculated: 1032 hPa
Reducing agent fill level sensor: act. value: 0.0 mm
Sensor for reducing agent tank temperature: temperature: -6.7 °C
Reducing agent system pressurization release conditions-Bits 0-7: 0
Reducing agent system pressurization release conditions-Bits 0-7: 251
Reducing agent system: current status: COSCR_AFTERRUN
Reducing agent system: current status-Test_Program_SCR Con State 01 UBYTE: 6

17262 - Terminal 30
U140A 00 [00100000] - Open Circuit
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Intermittent - Not Confirmed - Tested Since Memory Clear

4629 - ECM Power Relay Load Circuit
P068A 00 [00100000] - Opens Too Early
Intermittent - Not Confirmed - Tested Since Memory Clear

28922 - Reductant
P20E8 00 [11101101] - Pressure too Low
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 3
Mileage: 156868 km
Date: 2024.01.17
Time: 15:22:53

Engine RPM: 1341.00 /min
Normed load value: 78.8 %
Vehicle speed: 51 km/h
Coolant temperature: 86 °C
Intake air temperature: 49 °C

Ambient air pressure: 930 mbar
Voltage terminal 30: 14.320 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: -18.0 °C
Reducing agent pump module relative press.: calculated: 3432 hPa
Reducing agent fill level sensor: act. value: 31.3 mm
Sensor for reducing agent tank temperature: temperature: -9.0 °C
Reducing agent system pressurization release conditions-Bits 0-7: 0
Reducing agent system pressurization release conditions-Bits 0-7: 255
Reducing agent system: current status: COSCR_PRESSURECTL
Reducing agent system: current status-Test_Program_SCR Con State 01 UBYTE: 4

Readiness: 1 2 0 0 0

-------------------------------------------------------------------------------

CODES GOT CLEARED
SUBSEQUENT SCAN

Saturday,09,March,2024,07:08:22:48870

01-Engine -- Status: Malfunction 0010

-------------------------------------------------------------------------------

Address 01: Engine (J623-CVCA) Labels:. 04L-907-309-V1.clb
Part No SW: 04L 997 016 C HW: 04L 907 309 K
Component: R4 2.0l TDI H20 9467
Revision: 8AH20--- CVN: 121EE41138D3FF82B866C2AD
Coding: 01190012832410081000
Shop #: WSC 91599 999 00000
ASAM Dataset: EV_ECM20TDI01104L997016C 004002
ROD: EV_ECM20TDI01104L997016C.rod
VCID: 33651F329A8B8E090E-8066
VINID: 0669D39874430164C01022020454401E67

1 Fault Found:
9645 - Reductant
P20E8 00 [01100101] - Pressure too Low
Not Confirmed - Tested Since Memory Clear

Freeze Frame:
Fault Priority: 2
Fault Frequency: 1

Mileage: 158020 km
Date: 2024.03.04
Time: 20:30:29

Engine RPM: 2650.50 /min
Normed load value: 29.8 %
Vehicle speed: 23 km/h
Coolant temperature: 55 °C
Intake air temperature: 54 °C
Ambient air pressure: 930 mbar
Voltage terminal 30: 13.760 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: -19.5 °C
Reducing agent pump module relative press.: calculated: 5487 hPa
Reducing agent fill level sensor: act. value: 0.0 mm
Sensor for reducing agent tank temperature: temperature: -10.0 °C
Reducing agent system pressurization release conditions-Bits 0-7: 0
Reducing agent system pressurization release conditions-Bits 0-7: 255
Reducing agent system: current status: COSCR_PURGE
Reducing agent system: current status-Test_Program_SCR Con State 01 UBYTE: 8


Readiness: 0 0 0 0 1

 

[PetrolDave]

(I removed the unnecessary sections).

There are NO unnecessary sections when posting an Auto-Scan, context is important.

 

[SaVAGeSoot]

Clearly the OP doesn't want to follow any instructions at all.... this should go smoothly.

 

[jez]

There are NO unnecessary sections when posting an Auto-Scan, context is important.

I removed irrelevant sections such as about the radio, and a side-marker light-bulb that burnt out...
My post was editted to show the issues that showed up.

 

[jez]

Clearly the OP doesn't want to follow any instructions at all.... this should go smooth

What instructions? Where? I have been unable to find a clear procedure relevant to the 2015 CVCA Passat TDI.
I believe the 2014 and earlier TDI's use different procedures, and much more information is available.

This is all a headache for me, learning about the SCR system PLUS the Ross-Tech VCDS software.
In hindsight I recognize mistakes I made.
Anyways I am looking for help and useful information here (not sarcasm).

 

[MrMeeseeks]

Start here: https://forums.ross-tech.com/index.php?threads/101/

Having a full unedited autoscan tells the forum what the car is equipped with. In some instances, an engine ECU fault flagged, could actually be a fault flagged in a different module, or a communication issue. This is why a full autoscan is important in diagnosing a fault first time, and correctly.

 

[SaVAGeSoot]

Anyways I am looking for help and useful information here (not sarcasm)

I see....

This is all a headache for me, learning about the SCR system PLUS the Ross-Tech VCDS software.

Now I feel bad that unlike the rest of us who want to fix things ourselves, you weren't born with this natural knowledge
I guess you'll have to stick to reading user manuals, forums and service manuals to get up to speed.

PS Get verified
PPS Post an auto-scan

 

[PetrolDave]

I removed irrelevant sections such as about the radio, and a side-marker light-bulb that burnt out...

NO section is irrelevant, often modules throw up sympathy faults, so knowing ALL the details of a vehicle matters.

 

[Uwe]

I am looking for help and useful information here (not sarcasm).

Don't worry, there's no extra charge for the sarcasm.

-Uwe-

 

[jez]

Don't worry, there's no extra charge for the sarcasm.

-Uwe-

Is suppose sarcasm is "charged at a flat rate"

 

[jez]

My car is a 2015 PASSAT TdI (CVCA engine build).

Please advise how long should SCR metering/adaptation tests should take? I cancelled mine after waiting almost ten minutes.

Also with the car ignition kept on, without engine running, how long do the glow-plug circuits stay heating? I intend to run an extended test with a battery charger plugged in, but I am waiting for snow to melt outside.

Are there adaptation code(s) to modify, before running the SCR metering quantity test? This forum mentions this, plus a VW technical bulletin for installing new SCR pumps, specifying setting a value of "2", instead of "4"?


Thanks! I am learning also kinds of SCR Vag-Com sorcery lately. I will post lengthy auto-scans soon.

 

[Uwe]

Please advise how long should SCR metering/adaptation tests should take? I cancelled mine after waiting almost ten minutes.

My recollection is it can be longer than that. This was from a VAG training video that I doubt is public, from many years ago.

-Uwe-