I was experiencing the same code with my Onan 4000. After much research I installed a vent in the bay door which isolates the intake air to the outside. Before it was sucking the hot air from under the coach and the engine area.The black boot fits between the door and face of the generator. I believe the intake air on the 5000 is different. I will say it was very hot outside when mine was doing this. In the 90's.
I also believe the 5500 gets its intake air from the bottom so this will not work for you. Some peolple added an extra fuel pump for this issue.
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Ace 30.1
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