Power Steering Failure

[svt]

I have a 2016 with a dead standard power steering rack. I was driving through heavy rain and received the yellow notice and the dreaded red "do not drive" notice a few minutes later. Once I got home, I looked under the car and saw that the boot on the tie rod was no longer connected to the base, so I assume water intrusion caused the rack to fail. The car is not eligible for the extended warranty on this part as the car has a branded title.

Before I commit several thousands to the replacement of the rack, is there a way to "reset" the rack to see if it was actually fried? I have VCDS and here are the codes that resulted from this:

Address 03: ABS Brakes (J104)       Labels:. 8K0-907-379-V2.clb
   Part No SW: 8K0 907 379 CP    HW: 8K0 907 379 CP
   Component: ESP8 quattro  H09 0020 
   Revision: --------    Serial number: --------------
   Coding: 281D1A01
   Shop #: WSC 06325 000 00000
   VCID: 0919C238A09C08DE94-805C

2 Faults Found:
01309 - Power Steering Control Module (J500)
            013 - Check DTC Memory
             Freeze Frame:
                    Fault Status: 01101101
                    Fault Priority: 6
                    Fault Frequency: 8
                    Reset counter: 242
                    Mileage: 65420 km
                    Time Indication: 0
                    Date: 2025.04.26
                    Time: 11:41:38

             Freeze Frame:
                    Hex Value: 0x0000
                    Hex Value: 0x0782
                    Hex Value: 0x000C
                    Hex Value: 0xC09A
                    Hex Value: 0x0000



Address 44: Steering Assist (J500)       Labels:| 8K0-909-144.clb
   Part No SW: 8K0 909 144 P    HW: 8K0 909 144 B
   Component: RCEPS         H43 0510 
   Revision: 00001000    Serial number: 0012807362 Dataset Number: 8K0909852L  0026
   Coding: 100000010001
   Shop #: WSC 06324 000 00000
   ASAM Dataset: EV_RCEPSAU48X 008018
   ROD: EV_RCEPSAU48X_008.rod
   VCID: 3E7361E4A1D2FF66F1-806A

2 Faults Found:
7341600 - Position Sensor for Motor
          C10AD 29 [00001000] - Signal Implausible
          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 27
                    Mileage: 65527 km
                    Date: 2025.04.26
                    Time: 16:26:54

                    Write only channel

7341570 - Position Sensor for Motor
          C10AD 29 [10001001] - Signal Implausible
          [New feature! Extended UDS fault detail is only supported by current gen. interfaces]
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 65418 km
                    Date: 2025.04.26
                    Time: 11:17:17

                    Write only channel

[Smac770]

https://youtu.be/DMZlWpWf8Ow
Some real world visuals of the situation, though I have no idea what the guy is saying.

Google "audi ssp 480" and look at page 22. You see in the illustration of the J500 control module on the end opposite the connectors is the motor position sensor sticking up towards where the rotor would be.

The J500 at least is responsive to the scan tool. No idea if there's a basic setting in the J500 you could invoke to recalibrate the motor position sensing. Or if it's like the video and a bit toasted.

Some people have been able to just replace the J500, depending on the core issue, but it's a real gamble. Audi considers the rack and J500 a single non-serviceable component on the MLB platform.