Transmission codes u0001, u0002, and u0101?

2010 MERCEDES BENZ C300
123,000 MILES • V6 • 4WD • AUTOMATIC
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BHAMDOC1973
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Drives well but i have codes u0001,u0002, and u0101. Read somewhere that it could be moisture in the trunk on right side by fuse box. It was damp there but there was no water in the box at all. Cleaned all connectors with electric spray. Still have the codes. What is back there that could be affected?
Feb 15, 2023 at 7:10 PM
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STRAILER
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Hello,

U0001 High Speed CAN communication bus loss
U0101 TCM unable to communicate with other control modules on the vehicle.

I would check the fuse with the key on here is a guide and fuse location in the images below, and if okay I would dry everything out and then replace the TCM which I have included the location and instructions in the images below as well. Please let me know what happens.

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Feb 16, 2023 at 11:53 AM
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BHAMDOC1973
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Can you tell me where the modules are that are responsible for the CAN for the connection between car and TCM? I am trying to find out if it's an internal transmission issue or a module issue. All fuses are okay.
Feb 18, 2023 at 5:23 AM
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STRAILER
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I don't think it is internal because the code is "TCM unable to communicate with other control modules".

So, if the fuses are good, it should be the module.

Feb 18, 2023 at 7:18 PM
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BHAMDOC1973
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Do you know where the module is?
Feb 18, 2023 at 7:20 PM
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STRAILER
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It is in the images in the first post. Under the passengers side carpet.
Feb 19, 2023 at 11:10 AM
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BHAMDOC1973
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First image does not show any modules on passenger side or by footwell.
Feb 20, 2023 at 4:27 AM
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BHAMDOC1973
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I looked there and there is nothing, its empty, usually a class has ton of modules there. Saw a bit of oil in the connector to the transmission, cleaned it and will see if it makes any difference, 4 wires going in. That is all i found, nothing on side of transmission as well.
Feb 20, 2023 at 4:32 PM