JiMbLeFiSh

Arnob80, thanks for the heads up on the out of site potential rotting. I will 100% be undertaking a proper electrical diagnosis soon... continuity, power, grounds, resistance/resistance under load. It's going to be a real party :D I've been a little busy with life up until now but good news, I was able to get the MOT passed today with a bridged relay and clearing all faults with VCDS. Now that's out of the way I can relax about where to park the car legally and dig in with finding the cause. I'm considering electrical diagnosis as a career avenue. Seems cars now have so much installed and connected that it really is a head scratcher when something goes wrong and honestly, I really enjoy trying to find the root cause. I will update as soon as I have something to report. Thank you all for your replies and have a most enjoyable bank holiday weekend. Jimble

I'm going to have to get some current flow diagrams and get pokey with the metre it seems 😬🤌🏻

Apologies for the confusion. I was able to code the battery through the CAN gateway module using UDS. I changed 1 character in the serial and updated it's recorded capacity from 92ah(old battery) to 95ah for the new one. I would have coded it with the correct serial number had I not installed and replaced everything in the tyre well. Should have got a photo beforehand.

With relay 645 bridged, ignition and engine on, second scan and a clear of DTC's shows all dash lights out and only 12 faults. Driver dash and Headlight range control still disconnected. Could any of these faults be down to a necessary calibration? 01-Engine -- Status: OK 0000 03-ABS Brakes -- Status: Malfunction 0010 04-Steering Angle -- Status: OK 0000 05-Acc/Start Auth. -- Status: Malfunction 0010 08-Auto HVAC -- Status: OK 0000 09-Cent. Elect. -- Status: Malfunction 0010 10-Park/Steer Assist -- Status: OK 0000 15-Airbags -- Status: Malfunction 0010 16-Steering wheel -- Status: OK 0000 17-Instruments -- Status: Malfunction 0010 19-CAN Gateway -- Status: Malfunction 0010 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 52-Door Elect, Pass. -- Status: OK 0000 53-Parking Brake -- Status: Malfunction 0010 55-Headlight Range -- Status: Cannot be reached 0100 5F-Information Electr. -- Status: OK 0000 62-Door, Rear Left -- Status: OK 0000 72-Door, Rear Right -- Status: OK 0000 AC-Reductant Control -- Status: OK 0000 ------------------------------------------------------------------------------- Address 03: ABS Brakes (J104) Labels:. 4G0-907-379-V1.clb Part No SW: 4G0 907 379 L HW: 4G0 907 379 L Component: ESP PREMIUM H09 0450 Revision: -------- Serial number: -------------- Coding: 06A09F016005F9809B00 Shop #: WSC 02391 785 00200 ASAM Dataset: EV_ESPPremiAU57X 004039 ROD: EV_ESPPremiAU57X_004_AU57.rod VCID: 3A7B87EFBD5F904BCE-806E 2 Faults Found: 0781 - Function Restricted due to Missing Message(s) U1111 00 [00001001] - - [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:33 VzRef: 00 Bit Info 1: 00 Bit Info 2: 40 Bit Info 3: 00 Bit Info 4: 1F F-Path: 00 F-Type: E2 Uz: B9 0687 - Function Restriction due to Faults in Other Modules U1113 00 [00001001] - - [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:33 VzRef: 00 Bit Info 1: 00 Bit Info 2: 40 Bit Info 3: 02 Bit Info 4: 1F F-Path: 00 F-Type: B5 Uz: B9 ------------------------------------------------------------------------------- Address 05: Acc/Start Auth. (J393) Labels:. 8K0-907-064-05.clb Part No SW: 4H0 907 064 FN HW: 4H0 907 064 EN Component: BCM2 2.0 H36 0560 Revision: 00002001 Coding: 03B83046000000000000 Shop #: WSC 02391 785 00200 VCID: 7AFB47EFF5DF504B8E-802E Subsystem 2 - Part No SW: 4H0 905 852 C HW: 4H0 905 852 C Component: J764 ELV MLB H40 0046 Serial number: 3214000126482014 1 Fault Found: 01330 - Central Control Module for Central Convenience (J393) 013 - Check DTC Memory Freeze Frame: Fault Status: 01101101 Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Time Indication: 0 Date: 2026.04.19 Time: 01:54:32 ------------------------------------------------------------------------------- Address 09: Cent. Elect. (J519) Labels:. 4H0-907-063-V1.clb Part No SW: 4H0 907 063 CF HW: 4H0 907 063 F Component: BCM1 2.0 H12 0130 Revision: 20012002 Serial number: 00000001943917 Coding: 2600201040349F600481008300001D0C0F9D830827090201000004606100 Shop #: WSC 02391 785 00200 VCID: 6ED37BBFB9970CEB22-803A Subsystem 1 - Part No SW: 4G2 955 119 HW: 4G8 955 119 A Labels: 1KX-955-119.CLB Component: WWS57X 140919 H37 0080 Serial number: 141008214735 Coding: 0045F7 Subsystem 2 - Part No SW: 8U0 955 559 B HW: 8U0 955 559 B Labels: 8U0-955-559.CLB Component: G397_RLFS H06 0002 Serial number: 23396378 Coding: 02006D Subsystem 3 - Part No SW: 4G0 907 658 A HW: 4G0 907 658 A Component: Humidity_Sens H03 0002 Serial number: 2E280557000000000001 3 Faults Found: 01771 - Control Module for Headlight Range (J431) 004 - No Signal/Communication Freeze Frame: Fault Status: 01100100 Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Time Indication: 0 Date: 2026.04.19 Time: 01:54:00 01800 - Light Switch (E1) 004 - No Signal/Communication Freeze Frame: Fault Status: 01100100 Fault Priority: 3 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Time Indication: 0 Date: 2026.04.19 Time: 01:54:00 03280 - Switch Position of Light-Switch Knob 008 - Implausible Signal Freeze Frame: Fault Status: 01101000 Fault Priority: 3 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Time Indication: 0 Date: 2026.04.19 Time: 01:54:00 ------------------------------------------------------------------------------- Address 15: Airbags (J234) Labels:* 4H0-959-655.clb Part No SW: 4H0 959 655 C HW: 4H0 959 655 C Component: Airbag10.43 H43 0040 Revision: -------- Serial number: 003JG00KH2WN Dataset Number: 4G0909602H 0002 Coding: 3032343631324E303235554A305234473053 Shop #: WSC 02391 785 00200 ASAM Dataset: EV_AirbaAU10BPAAU64X 001014 ROD: EV_AirbaAU10BPAAU64X_VW51.rod VCID: 366393DF8947742B2A-8062 Crash sensor for side airbag: driver side: Serial number: 3575HRB40592PMPQ88IC Crash sensor for side airbag: passenger side: Serial number: 3585HRB404V2PMPQBONF Rear Side Airbag Crash Sensor (on driver's side): Serial number: 3515JRB405H31R1QMH3P Passenger side rear thorax airbag crash sensor: Serial number: 3525JRB406332020L13V Crash sensor for front airbag: driver side: Serial number: 3554VRB405H32IIGG9AW Crash sensor for front airbag: passenger side: Serial number: 3564VRB405332IIGM14B 1 Fault Found: 1048581 - Databus U1123 00 [00001001] - Received Error Message [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:33 ------------------------------------------------------------------------------- Address 17: Instruments (J285) Labels:| 4H0-920-xxx-17.clb-SRI1 Part No SW: 4G8 920 984 H HW: 4G8 920 984 H Component: TDieGb H58 0622 Revision: 29460237 Serial number: 658190914596017 Coding: 33A40A000B412600010000 Shop #: WSC 02391 785 00200 ASAM Dataset: EV_RBD4K 004048 ROD: EV_RBD4K_AU57.rod VCID: 3B7582EBB265A943D5-806E 1 Fault Found: 16776970 - Function Restricted due to Missing Message(s) U1111 00 [00001001] - - [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:32 ------------------------------------------------------------------------------- Address 19: CAN Gateway (J533) Labels:| 4H0-907-468.clb Part No SW: 4G0 907 468 AD HW: 4G0 907 468 AC Component: J533--Gateway H13 0050 Revision: -------- Serial number: 00000001609691 Dataset Number: 4G0909515H 0067 Coding: 00CD074400 Shop #: WSC 02391 785 00200 GVL: BDA1C800DC6060030000 ASAM Dataset: EV_GatewPkoUDS 001019 ROD: EV_GatewPkoUDS_001_AU57.rod VCID: 72EB6FCFA5AF280BC6-8026 Battery Monitoring Control Module: Subsystem 1 - Part No SW: 8T0 915 181 HW: 8T0 915 181 Component: J367-BDMHella H03 8041 Serial number: 1140874703 Voltage stabilizer: Subsystem 2 - Part No SW: 8K0 959 663 D HW: 8K0 959 663 Component: J532_DCDCStab H23 0021 Serial number: 140828000000000002FC 2 Faults Found: 5013 - Headlight Range Control Module U101E 00 [00001001] - No Communication Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 2 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:33 Voltage terminal 30: 14.2 V Voltage terminal 15: 14.4 V Control Module temperature: 27 °C System status: Terminal 15 on IN ESP_standstill flag: standstill detected Engine running: On IN ZAS_Te_X: On Terminal 15 status via CAN: On Terminal 15 status: On Datenfeld: 0 0259 - Extended CAN Bus (SAE Bus C) U0047 00 [00001001] - Performance [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 2 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:33 Voltage terminal 30: 14.2 V Voltage terminal 15: 14.4 V Control Module temperature: 27 °C System status: Terminal 15 on IN ESP_standstill flag: standstill detected Engine running: On IN ZAS_Te_X: On Terminal 15 status via CAN: On Terminal 15 status: On Datenfeld: 0 ------------------------------------------------------------------------------- Address 46: Central Conv. (J393) Labels:. 4H0-907-064-46.clb Part No SW: 4H0 907 064 FN HW: 4H0 907 064 EN Component: BCM2 2.0 H36 0560 Revision: 00002001 Serial number: 0351166896 Coding: 011B062280B900408320080400010E470000000000000000000000000000 Shop #: WSC 02391 785 00200 VCID: 7AFB47EFF5DF504B8E-802E Subsystem 1 - Part No: 4G0 951 177 Component: DWA-Sensor H01 0010 Subsystem 2 - Part No: 1K0 951 605 C Component: LIN BACKUP HO H05 1501 1 Fault Found: 00457 - Central Electronics Control Module / BCM (J519) 013 - Check DTC Memory Freeze Frame: Fault Status: 01101101 Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Time Indication: 0 Date: 2026.04.19 Time: 01:54:32 ------------------------------------------------------------------------------- Address 53: Parking Brake (----) Labels: 4H0-907-801.clb Part No SW: 4H0 907 801 H HW: 4H0 907 801 A Component: EPB-4 H04 0015 Revision: -------- Serial number: 00000001253499 Dataset Number: 4G0909522D 0007 ASAM Dataset: EV_ParkiBrake 001028 ROD: EV_ParkiBrake_VW51.rod VCID: 2D51BCB37C1137F35B-8078 1 Fault Found: 465152 - Function Restriction due to Faults in Other Modules U1113 00 [00001001] - - [New feature! Extended UDS fault detail is only supported by current gen. interfaces] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency: 1 Reset counter: 90 Mileage: 153160 km Date: 2026.04.19 Time: 01:54:32 Voltage terminal 30: 14.5 V Internal Fault ID: 191 Vehicle speed: 0 km/h Network management state: normal Function light in parking brake button: On Red operating lamp: On Red warning lamp: OFF Green operating lamp: OFF Yellow warning lamp: OFF Terminal 15 status: On RWU: not active DSD: not active HTR: not active ECD: not active ACC requested apply: not active Auto Adjust: not active General Inspection Function: not active Internal Parking Brake state: static Status of parking brake button: Not operated Status ParkingBrake left: applied Status ParkingBrake right: applied ------------------------------------------------------------------------------- Address 55: Headlight Range Cannot be reached ------------------------------------------------------------------------------- End-------------------------(Elapsed Time: 04:10)-------------------------- ------------------------------12 Faults Found------------------------------

I'm getting +12v at ECM when relay 645 bridged in plenum relay box. Any ideas where to look next? Tools and time at the ready.

New battery installed, 3ah more than last at 95ah. Battery coded using 19 - CAN gateway (UDS) as module 61 does not appear in the installed module list. Second scan in progress. Currently with ignition on and not running I am receiving no +12v at pin 3 on ECM 🤷🏻‍♂️

Apologies for not getting back to you all and thank you for responding. I've been burning the candle both ends a little. I am here now though. Just picked up and installed Platinum AGM 95ah battery but module 61 either doesn't exist or can't be reached. It has never shown in an auto scan to date... otherwise I'd code it in. Did a scan after battery fit and then cleared DTC's. I was mid second scan when laptop died so I'm just waiting for a charge and then I'll complete a second scan.

How would I go about uploading a VCDS scan?

Hello there, Jimble here, My Audi A6 C7 2014 (15 plate) is having a no crank no start issue and I would like any input as I have got confused and I'm struggling. I'll give as detailed a history of faults and a breakdown of what I know and have done so far to the car. I can provide auto scans of previous states through this journey I'm on here. I bought the car in February 2022 with everything in working order. About 6 months into ownership I got the dash light "Headlight range control fault". I never investigated or cleared this. Skip forward to late 2024 early 2025 - I'm getting intermittent dash lights to accompany the HL range dash light (TPMS, ESC, START/STOP) and losing auto hold brake and cruise control. This problem seemed more likely to present itself in wet weather but not 100% of the time. Sometimes, stopping the car and turning it off would allow it to go away such as in short trips. I've also had on rare occasion the speedo needle act erratically and what feels like engine power pulses as if dropping out for a split second. October 2025 - No start/crank Inspecting the engine bay I discovered a classic blocked drain hole (composted leaves) by the ECM and relay box. Relay box corner screw faceless from rust, ECM heavily oxidised. No clear sign of any water ingress into the relay box. The ECM does concern me with a small area on the underside plating where the aluminium casting has oxidised very close to the seal and may have breached. When connected on bench it communicates and reports it's in connection hell so I assume it's working. In the car however, it can only be reached when the engine is running (bridged relay). Oscilloscope on the cars CAN H + L at the OBD2 port gives me signals that I'm unable to understand or shape into the square wave I see it should be. (Bought the scope, never used it until now so I'm learning). I may scope the ECM on the bench to test before opening it up should anyone believe it worth doing before trying anything else first. Bridging relay 645 in the plenum chamber allows starting and the car drives like it always has. It also produces less faults if bridged and engine running. I replaced the ride height sensor on the left side due to reporting a short. The sensor was seized solid, fitted new one, still reports short. Car is currently sitting with the headlight range control module disconnected. I was thinking this may have caused CAN interference and I may need to replace it as well so no point putting the dash back yet. I'm available to try your suggestions all day so I will be keeping an eye here for any advice. I will also most likely be popping down to get a new battery today, the original is still in there stamped: 45-14 😏 So I'd like to rule that out at least.