Adblue fault error + Engine light

[Astr0man]

Hey guys - my adblue levels went really low and at around 500 miles left, I pumped in adblue.

Since then - had an Adblue Fault appear intermittently and more recently an engine light kept popping up.


Here’s the codes I got:

5 Faults Found

5461 - Ignition Switch; ON Position
P2533 00 [096] - Short to Plus
Intermittent - Not Confirmed - Tested Since Memory Clear

9645 - Reductant
P20E8 00 [104] - Pressure too Low
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 5
Mileage: 116929 km
Date: 2024.02.17
Time: 22:52:38

Engine RPM: 833.50 /min
Normed load value: 25.9 %
Vehicle speed: 0 km/h
Coolant temperature: 64 °C
Intake air temperature: 17 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 14.600 V
Unlearning counter according OBD: 6
Outside temperature: 11.0 °C
Pressure sensor for reducing agent: measured pressure: -120 hPa
Pump for reducing agent: speed: 2988.0 /min
Sensor for reducing agent tank temperature: temperature: 13.2 °C
Reducing agent pump: activation: 50.00 %
Sensor for reducing agent fill level: fill level height: 47 mm
Sensor 2 for temp. reducing agent: act. value: 12.5 °C

11393 - Reductant Pressure Sensor Circuit
P204B 00 [175] - Implausible Signal
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 14
Mileage: 114903 km
Date: 2023.11.09
Time: 14:45:26

Engine RPM: 1223.00 /min
Normed load value: 0.0 %
Vehicle speed: 28 km/h
Coolant temperature: 18 °C
Intake air temperature: 9 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 14.660 V
Unlearning counter according OBD: 40
Outside temperature: 8.5 °C
Pressure sensor for reducing agent: measured pressure: -489 hPa
Pump for reducing agent: speed: 0.0 /min
Sensor for reducing agent tank temperature: temperature: 7.5 °C
Reducing agent pump: activation: 0.00 %
Sensor for reducing agent fill level: fill level height: 86 mm
Sensor 2 for temp. reducing agent: act. value: 7.0 °C

9643 - Reductant
P20E8 00 [104] - Pressure too Low
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 10
Mileage: 116919 km
Date: 2024.02.17
Time: 20:33:52

Engine RPM: 1134.00 /min
Normed load value: 67.8 %
Vehicle speed: 83 km/h
Coolant temperature: 93 °C
Intake air temperature: 13 °C
Ambient air pressure: 1020 mbar
Voltage terminal 30: 14.640 V
Unlearning counter according OBD: 6
Outside temperature: 12.5 °C
Pressure sensor for reducing agent: measured pressure: -144 hPa
Pump for reducing agent: speed: 2960.0 /min
Sensor for reducing agent tank temperature: temperature: 21.0 °C
Reducing agent pump: activation: 50.00 %
Sensor for reducing agent fill level: fill level height: 49 mm
Sensor 2 for temp. reducing agent: act. value: 17.0 °C

23765 - Control unit for information electronics 1
U1054 00 [032] - No Communication
[Information electronics control module 1No Communication]
Intermittent - Not Confirmed - Tested Since Memory Clear


Readiness: 1 3 0 0 0


———-


It’s a 2016 Q7 3.0 diesel.



Any ideas?

[Papereyes]

Was wondering if you overfilled it? Did that on mine and had to siphon some out in the end

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[Astr0man]

Oh dear…is that even a thing!? :O might have to wrap it in bubble wrap next time

[Papereyes]

Think it's too things

1: you need to fill with a minimum of 5litres

2: if you overfilled apparently can impact the starting if the car.

I Def overfilled mine and siphoned it out with plastic tubing and syringe

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[Crasher]

You will need the tank with pump and controller plus engine ECU software update. You can see the pump pressure sensor has failed in the freeze frame data, spinning at 3k rpm and producing half a Bar pressure. If you keep running it the ECU will overdose the system and fill the entire exhaust system with AdBlue crystals and they are a nightmare to get out. I have a pile of these tanks in various VAG versions sitting outside as the bin men won't take them. If you find cement like grit appearing in the tailpipes, stop driving but it may be too late by then.