[qcj]

There have been several occasions where my check engine light would come on and I look at the Detroit pro indicator and it would say aux output open circuit. It will stay on about 15 seconds and go off, then maybe come back on and go off again, and not come on anymore during an all day trip. This always happens at the beginning of a trip never during a trip. One would never know anything was happening if you did not see the light. Then I might not see it again for several months. Everything seems to be operating as it should. Looking at the DD codes in my booklet it would be #31.