A/C Climate Auto HVAC Troubleshooting (vcds codes logged)

boxer_flat4

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Hi all,

Hoping one of you kind folk would be up for helping me troubleshoot an issue I'm having with the ac & climate on my A6 C6 where to start with the ac stopped working (ac compressor isn't kicking in and the 2nd radiator fan isn't turning with the engine running and ECON button off)

This has then developed into some random weirdness with the climate controls and cabin fans appearing to have a mind of their own, either the cabin fans won't run, regardless of the fan speed selected or the fans start to run and then cut out.

I'm a complete novice when it comes to vcds (although trying to learn) having performed a scan the following fault codes shown:

----------------------------------------------------------------------------------------------------------------
Address 01: Engine Labels: Redir Fail!
Part No SW: 03G 906 016 MF HW: 03G 906 016 MF
Component: R4 2,0L EDC G000CG 1142
Revision: --H05--- Serial number:
Coding: 0000076
Shop #: WSC 00443 210 88216
VCID: 73E56ACB12B52113CE-8026

1 Fault Found:
005697 - Please check DTC Memory of A/C Controller
P1641 - 000 -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 6
Fault Frequency: 4
Reset counter: 255
Mileage: 262261 km
Time Indication: 0
Date: 2023.11.12
Time: 19:15:56

Freeze Frame:
RPM: 0 /min
Speed: 0.0 km/h
Load: 0.0 %
Voltage: 11.63 V
Bin. Bits: 00101000
Temperature: 75.6°C
(no units): 16.0

Readiness: 0 0 0 0 0
----------------------------------------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4F0-910-043.clb
Part No SW: 4F0 910 043 A HW: 4F2 820 043 P
Component: KLIMABETAETIGUNGH30 0020
Revision: 00000052 Serial number: 00000030288510
Coding: 0001300
Shop #: WSC 02325 758 00200
VCID: 1C376177DFABCE6B3F-8048

4 Faults Found:
00018 - Motor for Cold-Air Flap (V197)
003 - Mechanical Failure - Intermittent
Freeze Frame:
Fault Status: 00100011
Fault Priority: 3
Fault Frequency: 14
Reset counter: 185
Mileage: 262261 km
Time Indication: 0
Date: 2023.11.12
Time: 19:15:18

Freeze Frame:
Voltage: 11.20 V
Temperature: 17.0°C
(no units): 85.0
(no units): 43.0
Temperature: 18.0°C

00256 - A/C Pressure/Temperature Sensor (G395)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 145
Mileage: 262378 km
Time Indication: 0
Date: 2023.11.14
Time: 09:02:27

02071 - Local Databus
012 - Electrical Fault in Circuit - Intermittent
Freeze Frame:
Fault Status: 00101100
Fault Priority: 3
Fault Frequency: 19
Reset counter: 186
Mileage: 262261 km
Time Indication: 0
Date: 2023.11.12
Time: 21:07:37

01844 - Control Module for Fresh Air Blower (J126)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 9
Reset counter: 186
Mileage: 262266 km
Time Indication: 0
Date: 2023.11.13
Time: 13:53:09

Freeze Frame:
Temperature: 14.0°C
Speed: 36.0 km/h
(no units): 28.0
(no units): 201.0
-------------------------------------------------
Also attempted to perform measuring blocks for what I think are the offending the modules and get the following:

Address 08: Auto HVAC (4F0 910 043 A)

15:17:48 Group 011: Front Cold Air Flap Control Motor (V197) / Potentiometer (G315)
43.0 Current Value
39.0 Specified Value
44.0 Minimum Position (Lower Stop/Close)
215.0 Maximum Position (Upper Stop/Open)

15:17:48 Group 054: Refrigerant Pressure/Temperature Sensor (G395)
51.0 bar Refrigerant Circuit Pressure
0.0°C Refrigerant Temperature
0.0 SW/HW-Version Press./Temp.Sens.
00000000 Status Refrigerant Press./Temp.Sens.

15:17:48 Group 043: Fresh Air Blower Control Unit (J126) II
Not Occup.
Not Occup.
22.0°C Electronics Temperature
00000000 Status
-------------------------------------------------

Then after clearing all the fault codes, cycling the ignition off and on, then rescanning all the same set of fault codes get relogged.
 

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