09-29-2019, 03:15 PM
Hoosier,
We went through a period where we would get "low coolant / high voltage" alarms on the DDECII. It would simultaneously show CE & SE lights. Engine would shut down in 30 secs if I did not hit the "over-ride" switch on the dash. Coolant level itself was never low. Replaced the sensor, no change. After a few months of sporadic occurrence while driving I finally got the root cause fixed. It turned out that we had both house batteries with 1 or more bad cells. The problem was slow to manifest itself because we never boondock on only house battery power. If not on shore power the genny is almost always running. Xantrex charger is on all the time and battery banks auto merge while driving. When we replaced bad house batteries the problem quit until we had one engine battery develop a bad cell. Replaced both engine batteries and have no more issues with it. My theory is that when alternator & Xantrex tried to compensate for the bad cells, voltage would get instantaneously wonky going to the DDECII on occasion. Hopefully you problem is as easy to fix. I would continuous ly use the vmspc to clear codes but they would show back up at S&S shop when getting coach serviced. They would remain gone after they deleted them.
We went through a period where we would get "low coolant / high voltage" alarms on the DDECII. It would simultaneously show CE & SE lights. Engine would shut down in 30 secs if I did not hit the "over-ride" switch on the dash. Coolant level itself was never low. Replaced the sensor, no change. After a few months of sporadic occurrence while driving I finally got the root cause fixed. It turned out that we had both house batteries with 1 or more bad cells. The problem was slow to manifest itself because we never boondock on only house battery power. If not on shore power the genny is almost always running. Xantrex charger is on all the time and battery banks auto merge while driving. When we replaced bad house batteries the problem quit until we had one engine battery develop a bad cell. Replaced both engine batteries and have no more issues with it. My theory is that when alternator & Xantrex tried to compensate for the bad cells, voltage would get instantaneously wonky going to the DDECII on occasion. Hopefully you problem is as easy to fix. I would continuous ly use the vmspc to clear codes but they would show back up at S&S shop when getting coach serviced. They would remain gone after they deleted them.