Not familiar with your coach, where did you get that fault code from, dash display?
Might be just a bad/intermittent connection and checking those might solve the issue.
You might want to get an external code reader as that's the first thing Cummins would check. I've seen recommendations for displays like "ScanGauge D" (unless you already have a smart display) and "NEXAS Heavy Duty Truck Scanner NL102..." (external reader) etc. Different systems but should get the same results.
Then create an account in Cummins QuickServe with your engine serial #. You probably get more accurate info for your particular engine than generic internet sites.