MLB based Acc/Start Auth (J393) BCM2

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This page applies to Address 05-Acc/Start Auth. MLB based models such as the VW Touareg (7P/BP) and Audi A4 (8K), A5 (8T), Q5 (8R) in addition to the A6/A7/A8 (4G/4H) models with J393 Component: BCM2 1.1 and BCM2 2.0. It does NOT apply to MLBevo models using Component BCM2 MLBevo.

The installed BCM2 can be identified by evaluating the data in the Auto-Scan:

 Address 05: Acc/Start Auth. (J393)       Labels: 8K0-907-064-05.clb
     Part No SW: 8K0 907 064 DG    HW: 8K0 907 064 DG
     Component: BCM2 1.1      H02 0321
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 4H0 907 064 BR    HW: 4H0 907 064 BR
   Component: BCM2 2.0      H31 0330


This control module is the Immobilizer (KESSY) and it uses Address words 05- Acc/Start Auth. (J393) in addition to Address 46-Central Conv. (J393). Replacement of this control modules will result in Immobilizer problems in addition to Component Protection (CP) DTCs which cannot be resolved using VCDS. See the Replacement section below.


Coding information is available while connected to the vehicle with VCDS using the Long Coding Helper.


Immobilizer component matching and Component Protection can only be learned/disabled using the Factory Tool in Combination with an online Connection with GeKo access. This can be completed online at the dealer or by using a Pass-Thru (J2534) device per the notes on our Official Factory Repair Information page.