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Hi my name is Robert...
This is a very hard code to troubleshoot,
The J1939/J1850 is a data communications circuit used to send information to the dash gauge cluster from the engine and/or trans. computers. This information is typically vehicle speed, engine temp., oil pressure, engine speed, fuel level, etc., all the information needed for the gauges to display their readings and the trip computer to make its calculations.
This could be a loose connector, an intermittent wire fault or a multitude of other problems that can be very difficult to find. You could try and pull the chassis battery cables for a few mins to see if that helps, sometimes it will reset the system. Check all connectors and fuses for the chassis.
Having codes pulled might also help.... I would have the local garage shop have a look at this one just for the fact it can be a difficult issue to resolve with all the wiring involved, if you have not checked your chassis battery voltage and disconnected the cables I would try that first..... Hope this helps some, IF you have more questions or concerns please feel free to contact me.... Roberrt
Hi... Was just checking in to see if my answer helped?? IF you have more questions or concerns please feel free to contact me....