Sounds like you are using the older version of DIS/GT1 software, (v43) which works great and all, but is a few years outdated. If the TCU was replaced recently it has much newer software than the GT1 which is why it says "unknown module variant". If you switch to the GT1 v55 or v56 it should do better with communicating with the TCU.

And I wouldn't try programming the TCU with the older software, you would need the latest progman software as that is probably what they used at the dealer.

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