Diagnostic help: DPF and reductant pump VCDS fault codes - Club Touareg Forums
 
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post #1 of 1 Old 06-17-2017 Thread Starter
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Touareg: 2012 V6 TDI
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Diagnostic help: DPF and reductant pump VCDS fault codes

I'm seeking interpretations of the faults below which are related to the DPF and reductant supply systems. The "reductant purge valve" shows failed going back a few months. I assume this failed valve meant that no AdBlue was being sprayed into the exhaust. Two days ago the egg went into limp mode and the glow plug indicator was blinking. After a restart, no problem. The VCDS scan identifies a number of faults related to the DPF.

The question I pose is: Could the failing of the AdBlue pump cause issues with the DPF system? My research says the reductant/treatment occurs after the DPF.

BTW, I brought the egg to the dealer on Thursday because it went into limp mode and I thought the mechanic was going to say that something in the DPF system needed to be repaired or replaced but to my surprise, he advised that the "N80" pump should be replaced and possibly the wiring harness (at a cost of ~$1,100).

I appreciate any insights or guidance offered. As the 12's can't be repaired I'm going to be selling it back to VW in a few months after the Canadian 3.0L settlement is completed, so I don't want to spend a bunch of dough on it unnecessarily. That said, I don't want to ignore an issue that could lead to engine failure.

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Address 01: Engine (J623-CATA) Labels: 059-907-401-V2.clb
Part No SW: 7P0 907 401 J HW: 7P0 907 401 E
Component: 3.0TDI EDC17 H17 0005
Revision: 56H17---
Coding: 292A4012233600050000
Shop #: WSC 27384 001 1048576
ASAM Dataset: EV_ECM30TDI0117P0907401J 001005
ROD: EV_ECM30TDI0117P0907401J.rod
VCID: 36633F83892382F103-8062

7 Faults Found:
4914 - Diesel Particle Filter; Differential Pressure Sensor
P2453 00 [172] - Implausible Signal
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 102732 km
Date: 2017.06.15
Time: 08:27:38

Engine speed: 936.00 /min
Normed load value: 22.7 %
Vehicle speed: 0 km/h
Coolant temperature: 16 C
Intake air temperature: 13 C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 13.260 V
Unlearning counter according OBD: 40
Sensor for particle filter differential press: raw value: -50 hPa
Particle filter: difference pressure: -50 hPa
Particle filter: offset for differential press.: 0 hPa
Particle filter: differential pressure: dynamic offset: 0 hPa
Outside air temperature: 11.5 C
Particle filter: soot mass measured: 1.47 g
Particle filter: soot mass calculated: 20.08 g

5183 - Particulate Trap Bank 1
P2002 00 [237] - Efficiency Below Threshold
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 8
Mileage: 102732 km
Date: 2017.06.14
Time: 21:27:59

Engine speed: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 69 C
Intake air temperature: 20 C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.460 V
Unlearning counter according OBD: 40
Exhaust gas jet volume in particle filter: 0.0 m/h
Particle filter: difference pressure: -2 hPa
Particle filter: soot mass measured: 1.59 g
Particle filter: soot mass calculated: 20.08 g
Particle filter: differential pressure: dynamic offset: 0 hPa
Exhaust gas temperature sensor 3: 233.6 C
Exhaust gas temperature sensor 4: 145.2 C

9644 - Reductant
P20E9 00 [232] - Pressure too High
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 97
Mileage: 97973 km
Date: 2017.03.24
Time: 11:16:59

Engine speed: 803.50 /min
Normed load value: 38.4 %
Vehicle speed: 0 km/h
Coolant temperature: 56 C
Intake air temperature: 7 C
Ambient air pressure: 1020 mbar
Voltage terminal 30: 13.340 V
Unlearning counter according OBD: 40
Outside air temperature: -0.0 C
Pressure sensor for reducing agent: measured pressure: 7316 hPa
Sensor for reducing agent fill level: fill level: 80.44 %
Sensor for reducing agent tank temperature: temperature: 6.4 C
Reducing agent pump: activation: 6.49 %

9658 - Reductant Pressure Sensor Circuit
P204B 00 [232] - Implausible Signal
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 17
Mileage: 98611 km
Date: 2017.04.08
Time: 09:36:51

Engine speed: 991.00 /min
Normed load value: 24.3 %
Vehicle speed: 0 km/h
Coolant temperature: 17 C
Intake air temperature: 16 C
Ambient air pressure: 990 mbar
Voltage terminal 30: 11.200 V
Unlearning counter according OBD: 40
Outside air temperature: 12.5 C
Pressure sensor for reducing agent: measured pressure: 775 hPa
Sensor for reducing agent fill level: fill level: 80.40 %
Sensor for reducing agent tank temperature: temperature: 11.0 C
Reducing agent pump: activation: 87.99 %

9636 - Purge Valve for Reductant
P20A0 00 [175] - Open Circuit
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 9
Mileage: 94319 km
Date: 2017.01.18
Time: 19:32:01

Engine speed: 759.50 /min
Normed load value: 18.8 %
Vehicle speed: 0 km/h
Coolant temperature: 70 C
Intake air temperature: 25 C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 14.800 V
Unlearning counter according OBD: 40
Outside air temperature: 9.5 C
Pressure sensor for reducing agent: measured pressure: 661 hPa
Sensor for reducing agent fill level: fill level: 80.47 %
Sensor for reducing agent tank temperature: temperature: 4.0 C
Reducing agent pump: activation: 87.99 %

9638 - Purge Valve for Reductant
P20A2 00 [237] - Short to GND
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 4
Mileage: 94370 km
Date: 2017.01.19
Time: 18:49:26

Engine speed: 743.00 /min
Normed load value: 36.9 %
Vehicle speed: 0 km/h
Coolant temperature: 83 C
Intake air temperature: 32 C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.140 V
Unlearning counter according OBD: 40
Outside air temperature: 11.0 C
Pressure sensor for reducing agent: measured pressure: 536 hPa
Sensor for reducing agent fill level: fill level: 80.44 %
Sensor for reducing agent tank temperature: temperature: 6.5 C
Reducing agent pump: activation: 87.99 %

5162 - Diesel Particle Filter; Differential Pressure Sensor
P2453 00 [096] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 102723 km
Date: 2017.06.14
Time: 14:34:43

Engine speed: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 79 C
Intake air temperature: 36 C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.400 V
Unlearning counter according OBD: 39
Sensor for particle filter differential press: raw value: 36 hPa
Particle filter: difference pressure: 38 hPa
Particle filter: offset for differential press.: -2 hPa
Particle filter: differential pressure: dynamic offset: 0 hPa
Outside air temperature: 20.5 C
Particle filter: soot mass measured: 7.78 g
Particle filter: soot mass calculated: 27.39 g
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