This concerns an unaccounted alarm in dash going off in a 2005 Holiday Rambler with a 330-horsepower Cummins engine and Allison tranny. On a hot day while climbing a long, steep incline, an alarm started to sound. First it was soft but grew louder and more insistent. All gauges read normal. By the time we reached top of the rise it was quite loud. As we crested and started down in, the sound gradually got softer and then quit. No lights or error codes.
Any thoughts?
Larry B