C7 RS6 Steering Fault/Issues

[mikec1979]

Hi all,

Hoping someone may be able to help. I have a yellow power steering light on, was intermittent, now it wont clear. Had it scanned:

Address 44: Steering Assist (J500) Labels:| 4G0-909-144.clb
Part No SW: 4G0 909 144 T HW: 4G0 909 144 Q
Component: RCevo H54 0202
Revision: 00000001 Serial number: 0000695588 Dataset Number: 4G0909852L 0037
Coding: 101001010001
Shop #: WSC 02391 785 00200
ASAM Dataset: EV_RCEPS 106007
ROD: EV_RCEPS_106.rod
VCID: BA3845153D6F52434D-80EE


1 Fault Found:
15888 - Terminal 15
U1405 00 [008] - Implausible signal
[Unplausibles Klemme 15 (Z¸ndungssignal)]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 153
Reset counter: 195
Mileage: 71116 km
Date: 2023.03.16
Time: 08:50:14


Write only channel


Obviously I am dreading a potential £4k bill for a new rack....

Has anyone come across this before?

Thanks in advance

[Crasher]

Have the lower covers removed and the steering gear plug removed to clean it with electrical cleaner and blow dry, often the steering gear is encased in soaking wet compost.

[mikec1979]

I did have it checked, covers off and everything inspected last week. I might do it again but really deep dive into cleaning everything and blowing everything out.

I have also bought a replacement wiring harness, same part number, in the event that the fault doesn't clear, to at least eliminate certain things.

I did have it briefly scanned with Odis and it was showing as implausible signal to the power cable, the plug that is in on a diagonal angle. I did wonder if it was an issue with my battery too as it is only showing as 67% effective.

Hoping it is not an issue with the control unit on the rack!

[Crasher]

Fit and code a new battery, EPAS systems hate low voltages.

[mickeybo]

Get your terminal 15 relay checked out

[mikec1979]

Where is the relay mate? I have been looking online but cant find it....

[mikec1979]

Booked in in the morning for a battery check. Can get a battery fit and coded for £155 if it is on the way out. Had it looked at very briefly by a mechanic mate today and it is struggling I think. Was at 80% efficiency, but 67% charging, and that was after being on the CTEK charger overnight...

[mikec1979]

Get your terminal 15 relay checked out

Where about is the relay located, Mickeybo?

[Crasher]

What is the VIN?

[johnsimcox]

Booked in in the morning for a battery check. Can get a battery fit and coded for £155 if it is on the way out. Had it looked at very briefly by a mechanic mate today and it is struggling I think. Was at 80% efficiency, but 67% charging, and that was after being on the CTEK charger overnight...
With those values after being on charge overnight I would think the battery is less than perfect. It would do no harm to change it, other than drain £155 from your wallet, I am assuming it is is the original battery and therefore at least 4 years old

[mickeybo]

Can you post up engine code

[mikec1979]

What is the VIN?

It is WUAZZZ4G0GN905041

Thank you

[Crasher]

Model: Audi RS6 plus Avant quattro 4.0 RS6
Date of production: 15.03.2016
Year: 2016
Sales type: 4GDRRA
Engine Code: CWUC
Transmission Code: RKF
Exterior colour and paint code: LY9B, exclusive colour

The line 15 really is under the dash on the right hand side at position 2 of a four point relay holder with the number 645 printed on top, part number 4H0 951 253 A and costs £26.83