Has this sled had the flywheel and stator replaced yet? The 13s had a bonding issue with the flywheel and it would come apart and take out the stator. When mine went it still ran well ridden hard but didn't like trail cruising.. this was warranty repaired, my repair order says the technician read P1563 with BUDS.
My EGT module died in January, that caused the gauge to say over-rev and limit rpm to around 4800. Code P0428 came up with this issue, but two others came on too, something about high voltage and over rev (don't recall those two exact codes).
The stator can be tested. I'd search over on Dootalk, seems to be a little more technical expertise over there.