Electrical problem! Help

Hello,



I have a 2016 Audi rs6. I hadn’t drove it for around 4 weeks, then I drove it for 15 minutes faultless until all of a sudden I had multiple warnings on the dash then the dash went completely black but the engine still runs. I have no hvac, no wipers no indicators no clocks but will still start up.



Anyway I did a scan with vcds and i can’t communicate to multiple modules.


I charged the battery just in case it was that also I have checked fuses which all seem to be ok.

here are the faults 9803 - No Communications with Parking Assist Control Module A

U0159 00 [00100111] - -

Not Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 6

Fault Frequency: 1

Date: 2000.00.00

Time: 00:00:00

Engine speed: 0.00 /min

Normed load value: 0.0 %

Vehicle speed: 0 km/h

Coolant temperature: 78 °C

Intake air temperature: 37 °C

Ambient air pressure: 1000 mbar

Voltage terminal 30: 11.944 V

Unlearning counter according OBD: 40

CAN status - engine control module-Bits 0-7: O

CAN status - transmission control module-Bits 0-7: 0

CAN status - brake control module 1-Bits 0-7: 0

CAN status - brake control module 2-Bits 0-7: 0

selected gear-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0



4708 - No Communications with HVAC Control Module (J301)

U0164 00 [00100111] - -

Not Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 6

Fault Frequency: 1

Date: 2000.00.00

Time: 00:00:00

Engine speed: 0.00 /min

Normed load value: 0.0 %

Vehicle speed: 0 km/h

Coolant temperature: 78 °C

Intake air temperature: 37 °C

Ambient air pressure: 1000 mbar

Voltage terminal 30: 11.944 V

Unlearning counter according OBD: 40

CAN status - engine control module-Bits 0-7: 0

CAN status - transmission control module-Bits 0-7: 0

CAN status - brake control module 1-Bits 0-7: 0

CAN status - brake control module 2-Bits 0-7: 0

selected gear-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0



4714 - Steering Column Control Module

U0212 00 [00100111] - No Communications Not Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 6

Fault Frequency: 1

Date: 2000.00.00

Time: 00:00:00

Engine speed: 0.00 /min

Normed load value: 0.0 %

Vehicle speed: 0 km/h

Coolant temperature: 78 °C

Intake air temperature: 37 °C

Ambient air pressure: 1000 mbar

Voltage terminal 30: 11.944 V

Unlearning counter according OBD: 40

CAN status - engine control module-Bits 0-7: 0

CAN status - transmission control module-Bits 0-7: 0

CAN status - brake control module 1-Bits 0-7: 0

CAN status - brake control module 2-Bits 0-7: 0

selected gear-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0



4715 - No Communication with Instrument Cluster

U0155 00 [00100111] - -

[New feature! Extended UDS fault detail is only supported by

current gen. interfaces]

Not Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 2

Fault Frequency: 1

Date: 2000.00.00

Time: 00:00:00

Engine speed: 0.00 /min

Normed load value: 0.0 %

Vehicle speed: 0 km/h

Coolant temperature: 78 °C

Intake air temperature: 37 °C

Ambient air pressure: 1000 mbar

Voltage terminal 30: 11.968 V

Unlearning counter according OBD: 40

CAN status - engine control module-Bits 0-7: 0

CAN status - transmission control module-Bits 0-7: 0

CAN status - brake control module 1-Bits 0-7: 0

CAN status - brake control module 2-Bits 0-7: 0

selected gear-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0

Cruise control switch actuation-Bits 0-7: 0



9803 - No Communications with Parking Assist Control

 

Suspect it is the battery, despite you changing it. At 11.9v is much lower than I would expect. Anything below 12.7v tends to throw up all sorts of random issues

 

I did wonder that. I charged the battery overnight. Tried clearing codes but still the same. I checked voltage at the battery with ignition off and I’m getting 12.2v