Activate AHK on Audi A4 B8

An aftermarket trailer hitch was installed on my vehicle (Audi A4 B8 2.7TDI, year 2011). Now, the coding of the control units has been attempted, but it was successful for all units except for SG3, the braking electronics module. The byte that needs to be set is Byte 1, Bit 7.

"Trailer detection and stabilization."

There, the following message appears:

"Encoding not accepted, error 33: access permission required."

What should I do?

Hello,

According to Ross-Tech, the corresponding login code/security access is already displayed in the tooltip when you hover the mouse cursor over the input field for the login code/security access in the ABS/ESP module.
Please review this.

Best regards, Rainer.

The AHK stabilization system in ABS/ESP is usually not reprogrammable and may not even be available.

Reason:
The registration document states that the stabilization system for the trailer hitch is only available if the trailer hitch is factory-installed.


I've had some vehicles before where that feature couldn't be coded.
The PQ35, on the other hand, automatically recognized it once the gateway was correctly encoded. It's possible that the manufacturers are now consistently blocking this feature through component protection.

I was able to code it on my A5, model year 2015.