I have a 2005 audi a6 2.4 auto. Recently I was driving down the dual carriageway at about the speed of 55mph. Suddenly everything went off the dash the whole car seemed to lose power for about 2 seconds. All this while I was doing 55mph. After about 2 seconds power came back and it had an error brake malfunction. The car slowly came to a halt. All the gear box lit up PDNS. I the got the keys out of ignition and reinstated the keys. The engine came back on I put it on drive but the ABS seemed to be holding the tyres down as I revved slowly it began to move until suddenly it started working fine again. I got these readings on my obd2

Battery regulator:
02479 - Partial consumer shut-off active
02254 - Interface to Generator

Parking sensors:
01543 - Parking Aid Warning Chime (H15)
01625 - Front Parking Aid Warning Chime (H22)

Ignition authorization:
00230 - Transmission Park Selector Switch (F305)
00447 - Function Limitation due to Voltage to High

Transmission:
18159 - Power Supply, Voltage High Voltage

Central electronics:
00003 - Control Module
01498 - Bulb for Parking Lamps, Right (M3)

Central electronics 2:
00447 - Function Limitation due to Voltage to High

Engine:
P1653 - Please check DTC Memory of ABS Control Module
P1423 - Secondary Air Injection System; Bank 1, Insufficient Flow

please if anyone can assist with help

 

How old is your battery? With that many DTCs and the engine stalling, I suspect your battery is dying.

 

thanks for the reply I did think it may be battery so I replaced the battery brought a new Bosch battery it was ok for a day and it started to happen again

 

did you measure voltage? Sounds like everything in the car tells the same story: voltage too high. Maybe the voltage regulator is gone.

 

I would suspect voltage regulator - check voltage under load