Hi,
This "No Bus" warning is indicating an electrical issue. More than likely this is a connector that has corrosion in it or a wire that is rubbed through.
Unfortunately, there is no way to tell you where this could be coming from. The way your modules communicate is over what is called a communication bus network. Basically, the modules send coded voltage signals to each other to send the messages that they need to in order to communicate properly.
The way to diagnose this is to monitor this bus voltage while it is acting up and then you can track down the issue by systematically disconnecting portions of the wiring until you find the issue.
This is the most complicated type of wiring/electrical diagnosis and causes many of the most seasoned techs major headaches at times.
What I would suggest, is monitoring when this happens, in turns, what speed are you going, did you run over some bumps? Just start tracking what it takes to get this to happen so that it can be replicated so that the chances of finding it will go up. You don't need to worry about any damage to components like the transmission. This is simply a wiring/electrical issue and will not do damage to the actual components.
There is a small chance that a module itself is the issue however, it is most always a wiring/connector issue.
Wednesday, June 23rd, 2021 AT 7:02 PM
(Merged)
