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Rally Racer
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What does communication bus A off mean
Welcome to the forum.
Communication bus A is a communication port for one of the computers.
I am guessing you have a U00XX code?

Usually it is loss of communication at a connector however not knowing the year, motor, transmission or specific code makes it difficult to say much more than that.
Also knowing what the symptoms are, how/when/why it stared will also help.

Think of it like going to the doctor and saying, "I have this pain, what is it?" 🤷‍♂️
 
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