Onan 5500 won't stay running, code 2

if your generator starts, then shuts down after a few seconds, this could be your fix.

[@carlbrown5150]

Moral of the story! Change your Oil on Time.!!

[@cecilargue9148]

It's only 3 yrs old and I assure your assumptions about oil changes are way off base. It's had nothing but good oil and timely changes.