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ABS not functioning

Shezza

New member
So I purchased an A6 C7 last year with 100K on it. Had the rear brakes replaced as part of the roadworthy.
I had to emergency brake and the wheels totally locked up. I have tested it multiple times and there is no sign of the ABS existing.
I have made sure the fuse is there, I have checked for faults, it says the ABS is ok. No lights, no indication there is anything wrong. So strange with such a sophisticated car!
I posted elsewhere and someone picked up that there was a fault logged that the "Changing brake lining" mode was still activated. I imagine it couldn't be driven if this was so, plus the EPB has worked fine. I figure they started the car while it was still in the mode, then ended the mode, though the fault code was already stored. Anyway, for good measure, I cycled the modes, made sure it was closed, everything looks ok. Cleared the codes, nothing coming back up.

I did have the fault "Function Restricted due to Missing Message(s)" against the ABS, though I cleared it before saving (oops) and it hasn't come back since. Here is my autoscan... Any thoughts?

Code:
Chassis Type: 4G-AU57 (4G0)
Scan: 01 02 03 05 08 09 10 15 16 17 19 20 28 36 3B 42 44 46 47 52
          53 55 56 5F 62 6C 72


VIN: WAUZZZ4G3CN093092   Mileage: 122088km-75861miles


01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
20-High Beam Assist. -- Status: OK 0000
28-HVAC, Rear -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
3B-Sensor Elect. -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CGWB)       Labels:. 06E-907-551-CGW.clb
   Part No SW: 4G0 907 551 F    HW: 4H0 907 551 
   Component: 3.0l V6 TFSIH07 0006  
   Revision: --H07---    
   Coding: 0A250034052701020000
   Shop #: WSC 02311 785 00200
   ASAM Dataset: EV_ECM30TFS0214G0907551F 001006
   ROD: EV_ECM30TFS0214G0907551F.rod
   VCID: 2C010460468084C745D-8078


No fault code found.
Readiness: 0000 0000


-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0B5-927-156.clb
   Part No SW: 4G1 927 156 D    HW: 0B5 927 156 F
   Component: 0B5 30TFSIRdW H10 0011  
   Revision: --H10---    Serial number: 0000000510
   Coding: 000001
   Shop #: WSC 04940 001 00001
   ASAM Dataset: EV_TCMDL501 A02196
   ROD: EV_TCMDL501.rod
   VCID: 2E050E68709CF6D76B9-807A


No fault code found.


-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 4G0-907-379-V1.clb
   Part No SW: 4G0 907 379 H    HW: 4G0 907 379 H
   Component: ESP PREMIUM   H09 0361  
   Revision: --------    Serial number: --------------
   Coding: 44A687012265E180CB00
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_ESPPremiAU57X 004028
   ROD: EV_ESPPremiAU57X_004_AU57.rod
   VCID: 3635260888CCCE17239-8062


No fault code found.


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 BT    HW: 4H0 907 064 BT
   Component: BCM2 2.0      H31 0333  
   Revision: 00002001    
   Coding: 05B82F06000000000000
   Shop #: WSC 02391 785 00200
   VCID: 7CA1F420F6E0D44795D-8028


No fault code found.


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 4G0-820-043-4Z.clb
   Part No SW: 4G0 820 043 K    HW: 4G0 820 043 K
   Component: KLIMA 4 ZONEN H12 0810  
   Serial number: 25111100040548
   Coding: 6621607828
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_AirCondiComfoUDS 002044
   ROD: EV_AirCondiComfoUDS_002.rod
   VCID: 270BFB4C5F66A79FA8F-8072


2 Faults Found:
0378 - Coolant Circulation Pump 
          B10D0 04 [008] - Internal System Fault
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 3
                    Fault Frequency: 7
                    Reset counter: 176
                    Mileage: 120636 km
                    Date: 2020.03.07
                    Time: 12:00:54


                    Voltage terminal 30: 14.63 V
                    Outside air temperature: 17.0 °C
                    Interior temperature: 31.68 °C


0379 - Supply Voltage Terminal 30 for Coolant Pump 
          B11D5 01 [009] - Electrical Failure
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 3
                    Fault Frequency: 254
                    Reset counter: 138
                    Mileage: 106130 km
                    Date: 2019.07.22
                    Time: 16:14:24




-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 4H0-907-063-V1.clb
   Part No SW: 4H0 907 063 BG    HW: 4H0 907 063 
   Component: BCM1 2.0      H12 0100  
   Revision: 11012002    Serial number: 00000001311026
   Coding: 0907A01009749FE00181008380001800CF9DC3082F080101000108542F01
   Shop #: WSC 02391 785 00200
   VCID: 6E85CE68B09CB6D72B9-803A


   Subsystem 1 - Part No SW: 4G2 955 119     HW: 4G8 955 119 A  Labels: 1KX-955-119.CLB
   Component: WWS57X 111027  H35 0051 
   Serial number:         111031140043
   Coding: 0045F7


   Subsystem 2 - Part No SW: 8K0 955 559     HW: 8K0 955 559   Labels: 8K0-955-559.CLB
   Component: RLS  H04 0003 
   Serial number: 11794796            
   Coding: 02512B


   Subsystem 3 - Part No SW: 4G0 941 531 E    HW: 4G0 941 531 E
   Component: E1 - LDS  H07 0044 
   Serial number: 23 11 2011  00000278


   Subsystem 4 - Part No SW: 4H0 907 472 B    HW: 4H0 907 472 B
   Component: A31 LED Mod1L  H03 0006 
   Serial number: 00000014111100010196
   Coding: 110000


   Subsystem 5 - Part No SW: 4H0 907 472 B    HW: 4H0 907 472 B
   Component: A27 LED Mod1R  H03 0006 
   Serial number: 00000011111100010572
   Coding: 110000


   Subsystem 6 - Part No SW: 4H0 907 658     HW: 4H0 907 658 
   Component: AQ_Hum_Sensor  H02 0002 
   Serial number: 38788DD5000000000001


2 Faults Found:
01493 - Bulb for Blinkers; Front Left (M5) 
            012 - Electrical Fault in Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 170
                    Mileage: 121850 km
                    Time Indication: 0
                    Date: 2020.03.21
                    Time: 16:44:00


01497 - Bulb for Blinkers; Front Right (M7) 
            012 - Electrical Fault in Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 170
                    Mileage: 121850 km
                    Time Indication: 0
                    Date: 2020.03.21
                    Time: 16:44:00




-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 4H0-919-475-7X2.clb
   Part No SW: 4H0 919 475 N    HW: 4H0 919 475 C
   Component: PARKHILFE ACC H07 0050  
   Revision: 11001001    Serial number: 55901132503196
   Coding: 280306
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_EPHVA18AU57X0000 002005
   ROD: EV_EPHVA18AU57X0000_002_AU57.rod
   VCID: 3D273924ADFA1D4FE23-8068


No fault code found.


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:* 4H0-959-655.clb
   Part No SW: 4H0 959 655 C    HW: 4H0 959 655 C
   Component: Airbag10.43   H40 0040  
   Revision: --------    Serial number: 003JG005K03N
   Coding: 30323436313330303534554A305234473053
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_AirbaAU10BPAAU64X 001014
   ROD: EV_AirbaAU10BPAAU64X_VW51.rod
   VCID: 3635260888CCCE17239-8062


   Crash sensor for side airbag: driver side: 
   Serial number: 3575HRB405T0TGJE8PLU


   Crash sensor for side airbag: front passenger side: 
   Serial number: 3585HRB405N0VP46591H


   Crash sensor for side airbag: rear: driver side: 
   Serial number: 3515JRB404R0R8AAMOF7


   Crash sensor for side airbag: rear: passenger side: 
   Serial number: 3525JRB40650TGJI1OU9


   Crash sensor for front airbag: driver side: 
   Serial number: 3554VRB405J0QBGIE12U


   Crash sensor for front airbag: front passenger side: 
   Serial number: 3564VRB40650Q4PIJ09V


No fault code found.


-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 4H0-953-568.clb
   Part No SW: 4G0 953 568 A    HW: 4G0 953 568 A
   Component: Lenks.Modul   H05 0201  
   Revision: 00000000    Serial number: 20141105000371
   Coding: 000034
   Shop #: WSC 52709 002 1048576
   VCID: 303910106A28E027795-8064


   Subsystem 1 - Part No SW: 4G0 951 528 A    HW: 4G0 951 528 A
   Component: E221 - MFL  H08 0009 


No fault code found.


-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 4H0-920-xxx-17.clb-SRI1
   Part No SW: 4G8 920 931 L    HW: 4G8 920 931 L
   Component: TBenRdw       H79 0416  
   Revision: 28460177    Serial number: 658211111591017
   Coding: 33AF08000B010008010000
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_RBD4K 004045
   ROD: EV_RBD4K_AU57.rod
   VCID: 372B2B0C8FC6371F38F-8062


No fault code found.


-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:* None
   Part No SW: 4G0 907 468 G    HW: 4G0 907 468 A
   Component: J533--Gateway H08 0214  
   Revision: --------    Serial number: 00000000318662
   Coding: 00CD073000
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_GatewUDS 001025
   ROD: EV_GatewUDS_AU57.rod
   VCID: 34311C009EB0DC071DD-8060


   Battery Monitoring Control Module: 
   Subsystem 1 - Part No SW: 8X0 915 181     HW: 8X0 915 181 
   Component: J367-BDM  H07 0141 
   Serial number: 00000000003790165884


   Voltage stabilizer: 
   Subsystem 2 - Part No SW: 8K0 959 663 B    HW: 8K0 959 663 B
   Component: J532_DCDCStab  H05 0006 
   Serial number: 11324000529021200410


No fault code found.


-------------------------------------------------------------------------------
Address 20: High Beam Assist. (J844)       Labels:. 8K0-857-511.clb
   Part No SW: 8K0 857 511 E    HW: 8K0 857 511 A
   Component: FLA           H04 0004  
   Revision: AA001002    
   Coding: 04028264747464545425363E
   Shop #: WSC 02391 785 00200
   VCID: 33331F1C9B3EDB3F047-8066


No fault code found.


-------------------------------------------------------------------------------
Address 28: HVAC, Rear (E265)       Labels:* 4G0-919-158.clb
   Part No SW: 4G0 919 158 C    HW: 4G0 919 158 C
   Component: KLIMA FOND    H07 0810  
   Serial number: 24111100040944
   Coding: 02
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_ClimaContrUnitRearUDS 002022
   ROD: EV_ClimaContrUnitRearUDS_002.rod
   VCID: 2F3B136C7796FFDF60F-807A


No fault code found.


-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136)       Labels: None
   Part No SW: 4G8 959 760     HW: 4G8 959 760 
   Component: MEM-FS        H03 0154  
   Revision: AA000000    Serial number: 00000016661804
   Coding: 00781B0000006001000001010101102030303232203232
   Shop #: WSC 02311 785 00200
   VCID: 77ABEB0CCFC6F71FF8F-8022


No fault code found.


-------------------------------------------------------------------------------
Address 3B: Sensor Elect. (J849)       Labels: 4G0-907-637.clb
   Part No SW: 4G0 907 637     HW: 4G0 907 637 
   Component: SARA 3D       H02 0004  
   Revision: --------    Serial number: EJ1BPA3200ZBSU0
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_SARA 006014
   ROD: EV_SARA_006.rod
   VCID: 6B83C77C830E43FF0C7-803E


No fault code found.


-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4H0-959-793.clb
   Part No SW: 4G8 959 793 E    HW: 4G8 959 793 A
   Component: TSG FA        H05 0212  
   Revision: --------    Serial number: --------------
   Coding: 011F16204E01620002080002
   Shop #: WSC 02312 785 00200
   VCID: 42DD4AD8D48462B79F1-8016


No fault code found.


-------------------------------------------------------------------------------
Address 44: Steering Assist (J500)       Labels:| 4G0-909-144.clb
   Part No SW: 4G0 909 144 T    HW: 4G0 909 144 Q
   Component: RCevo         H53 0202  
   Revision: 00000002    Serial number: 0000479077
   Coding: 101000010000
   Shop #: WSC 02263 002 1048576
   ASAM Dataset: EV_RCEPS 106007
   ROD: EV_RCEPS_106.rod
   VCID: 3A2D3238BCD42A77C71-806E


No fault code found.


-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 4H0-907-064-46.clb
   Part No SW: 4H0 907 064 BT    HW: 4H0 907 064 BT
   Component: BCM2 2.0      H31 0333  
   Revision: 00002001    Serial number: 0163704034    
   Coding: 01000E2200B9040581300804000303000000000000000000000000000000
   Shop #: WSC 02391 785 00200
   VCID: 7CA1F420F6E0D44795D-8028


   Subsystem 1 - Part No SW: 7P5 959 591     HW: 4H0 959 591 
   Component: J245 PS40.033  H07 0006 
   Serial number:     WOO1413314Y     
   Coding: 901E00


   Subsystem 2 - Part No SW: 3AA 962 243     HW: 3AA 962 243 
   Component: GEB.F.Heckoef  H12 0719 
   Serial number: 84183890            


1 Fault Found:
01565 - Luggage Compartment Light (W3) 
            009 - Open or Short to Ground
             Freeze Frame:
                    Fault Status: 01101001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 131
                    Mileage: 121896 km
                    Time Indication: 0
                    Date: 2020.03.22
                    Time: 20:13:10




-------------------------------------------------------------------------------
Address 47: Sound System (J525)       Labels: None
   Part No SW: 4G0 035 223 C    HW: 4G0 035 223 A
   Component: BOSE-G3-C7    H07 0160  
   Revision: CJ007001    Serial number: 00000000007609
   Coding: 030000
   Shop #: WSC 02391 785 00200
   VCID: 1D67D9A40DBA7D4FC23-8048


No fault code found.


-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 4H0-959-792.clb
   Part No SW: 4G8 959 792 E    HW: 4G8 959 792 A
   Component: TSG BF        H05 0212  
   Revision: --------    Serial number: --------------
   Coding: 011F16204E01620002080002
   Shop #: WSC 02312 785 00200
   VCID: 41DF45D4D18279AF86B-8014


No fault code found.


-------------------------------------------------------------------------------
Address 53: Parking Brake (----)       Labels: 4H0-907-801.clb
   Part No SW: 4H0 907 801 E    HW: 4H0 907 801 A
   Component: EPB-4         H03 0012  
   Revision: --------    Serial number: 00000000193815
   ASAM Dataset: EV_ParkiBrake 001022
   ROD: EV_ParkiBrake_VW51.rod
   VCID: 2A0D02784C749AF7B71-807E


1 Fault Found:
721152 - Brake Pad Replacement Mode Active 
          C1011 00 [000] - -
          Intermittent - Not Confirmed - Tested Since Memory Clear




-------------------------------------------------------------------------------
Address 55: Headlight Range (J431)       Labels:| 8X0-907-357.clb
   Part No SW: 4H0 907 357 A    HW: 4H0 907 357 A
   Component: ....LWR12.... H02 0013  
   Serial number: 111027-0002-016
   Coding: 1121A6601000A300
   Shop #: WSC 02391 785 00200
   ASAM Dataset: EV_HeadlRegulBasic 005001
   ROD: EV_HeadlRegulBasic.rod
   VCID: 2C010460468084C745D-8078


No fault code found.


-------------------------------------------------------------------------------
Address 56: Radio (R)       Labels: Redir Fail!
   Part No SW: 4G1 035 053 E    HW: 4G1 035 053 
   Component: Radio U Basic H41 0093  
   Revision: AB001007    Serial number: 227K 0B7510655
   Coding: 040003010000000001
   Shop #: WSC 02391 785 00200
   VCID: 211FE55431C259AFE6B-8074


No fault code found.


-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 4G0 035 754 G    HW: 4G0 035 754 A
   Component: H-BN-RW       H48 0484  
   Revision: --------    Serial number: 430KU0B7512281
   Coding: 050A01000003E1EF45008F2E00000003FC0001020000000000
   Shop #: WSC 02391 785 00200
   VCID: 2A0D02784CF49AF7B71-807E


   Subsystem 1 - Part No: 8R0 060 884 AJ
   Component: ROW 2012  0403 


   Subsystem 2 - Part No SW: 4G0 919 605 A    HW: 4G0 919 605 A
   Component: DU8 C7 SV  H42 0021 
   Serial number: AUZ8ZDB13024HVS     


   Subsystem 3 - Part No SW: 4G2 919 610 C    HW: 4G2 919 610 C
   Component: E380 BDT C7  H11 0204 
   Serial number: 90349KKC000B3       


   Subsystem 4 - Part No: 8R0 060 961 C
   Component: CD-Database  3638 


No fault code found.


-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4H0-959-795.clb
   Part No SW: 4G8 959 795 E    HW: 4G8 959 795 A
   Component: TSG HL        H04 0212  
   Revision: --------    Serial number: --------------
   Coding: 010F14204001620002080002
   Shop #: WSC 02312 785 00200
   VCID: 44D14CC0CE906C87ADD-8010


No fault code found.


-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 4H0-907-441.clb
   Part No SW: 4G0 907 441 B    HW: 4H0 907 441 
   Component: SG Rueckfahrkamera  0061  
   Revision: --H04---    Serial number: 525 PA8J1YG2UP
   Coding: 1080004
   Shop #: WSC 02391 785 00200
   VCID: 2615F64854ECBE97939-8072


No fault code found.


-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4H0-959-795.clb
   Part No SW: 4G8 959 795 E    HW: 4G8 959 795 A
   Component: TSG HR        H04 0212  
   Revision: --------    Serial number: --------------
   Coding: 010F14204001620002080002
   Shop #: WSC 02312 785 00200
   VCID: 44D14CC0CE906C87ADD-8010


No fault code found.


End----------(Elapsed Time: 02:03, VBatt start/end: 14.7V/14.8V)-----------


 
stupid question, but did you keep your foot on the pedal to see if the ABS came on, or did you just off the brakes when the skidding started?
 
stupid question, but did you keep your foot on the pedal to see if the ABS came on, or did you just off the brakes when the skidding started?
Free to ask! I definitely held for a little, tried to give it a chance... It is not in the least bit interested. I think my ABS is a really lazy #$@%
 
Sometimes, the pistons of the valves in the ABS block can become stuck due to moisture in the brake fluid. There is an inlet and outlet valve for each wheel of the ABS block, generally. When braking, if the ABS detects a locked wheel/s, determined by speed pulses back from the wheel sensor. The ABS firstly closes of the inlet valve/s to the affected wheel/s, then may either release the inlet valve or keep it closed and then open the outlet valve for the affected wheel/s. This action is what causes the noise you hear when the ABS is operating correctly.
 
Sometimes, the pistons of the valves in the ABS block can become stuck due to moisture in the brake fluid. There is an inlet and outlet valve for each wheel of the ABS block, generally. When braking, if the ABS detects a locked wheel/s, determined by speed pulses back from the wheel sensor. The ABS firstly closes of the inlet valve/s to the affected wheel/s, then may either release the inlet valve or keep it closed and then open the outlet valve for the affected wheel/s. This action is what causes the noise you hear when the ABS is operating correctly.
And if it is the moisture, how do you confirm it and fix it?
 
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