On Thursday night I drove 180 miles in a North Easter storm arrived at campsite at about 22:30 and was trying to find my site when rig came to a stop, engine running on what sounded like 4 cylinders with display showing Reduced Power mode. I tried various ways to rest, nothing worked. All that happened was I got soaked to the bone. Spent the night just where we were. Friday checked all fuses, did a chassis battery disconnect, engine would start and run at about 1000 RPM and no more. Ended up with me being towed to nearest GM dealer. They plan to take a look on Monday AM. I think I read about this some time ago on your site. Is it a water related problem?