Mercedes Transmission Control Unit Clone by Autel IM508/608 Tutorial

This article is a tutorial on how to clone a Mercedes-Benz Transmission Control Unit (TCU) by Autel MaxiIM IM608. Autel MaxiIM IM508 also supports this function.


Model: Mercedes-Benz GL450 2008


Step 1. Connection

Go to

IMMO>>Mercedes-Benz>>Manual selection>>GL/GLS>>2006-2008>>Control unit>>TCU tools

Now we are on the TCU menu.

Click on “Wiring diagram” and complete connection by it.

For connection, I use the attachment of G-BOX2, the DB15 cable to connect power and GND, CAN-H and CAN-L, and put another 120-ohm resistor between CAN-H and CAN-L, so the CAN system can work.

By the way, the connection could be easier with some cables.


Step 2. Renew/Erase TCU

Now we’re going to read and save TCU data and renew TCU to get a password to erase it (network required), since it’s a used one.

Select “Read TCU data”.

Here “Personalized” and “Activated” are “No” because I’ve already renewed it, and at the beginning they are both “Yes”.

Just press “OK” to save it.

Then go to “Renew TCU” and follow the instructions.


Step 3. Read original TCU

The next step is to remove the old TCU from the car, read the original info, write that original info into this renewed one, and put this new TCU back in the car.

So we connect wires to the original TCU like before.

Read original data. As you can see, it’s personalized and activated since it has never been renewed.

Save the data.


Step 4. Write original data into new TCU

Again, connect wires to the new TCU.

Load original info on “Load TCU data”.

Write info into the new TCU on “Write TCU data”.


Done! Your car will think this new TCU is the exact same one.

Good work from Mr. Uyug

Hope it helps someone.


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