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Transmission codes U0001, U0002 and U0101?

Tiny
BHAMDOC1973
  • MEMBER
  • 2010 MERCEDES BENZ C300
  • V6
  • 4WD
  • AUTOMATIC
  • 123,000 MILES
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?
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Wednesday, February 15th, 2023 AT 7:10 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
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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Thursday, February 16th, 2023 AT 11:53 AM
Tiny
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.
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Saturday, February 18th, 2023 AT 5:23 AM
Tiny
KEN L
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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.
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Saturday, February 18th, 2023 AT 7:18 PM
Tiny
BHAMDOC1973
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  • 1,667 POSTS
Do you know where the module is?
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Saturday, February 18th, 2023 AT 7:20 PM
Tiny
KEN L
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  • 48,505 POSTS
It is in the images in the first post. Under the passengers side carpet.
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Sunday, February 19th, 2023 AT 11:10 AM
Tiny
BHAMDOC1973
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First image does not show any modules on passenger side or by footwell.
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Monday, February 20th, 2023 AT 4:27 AM
Tiny
BHAMDOC1973
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  • 1,667 POSTS
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.
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Monday, February 20th, 2023 AT 4:32 PM

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