Cummins Onan QG5500 generator Code 45 fix

If your Cummins Onan QG5500 gas generator is not producing power (flashing red light), running rough or surging, or shutting off with a Code 45 fault, this video may help you! Of course there are other reasons the generator could do this, however this was the first time I found a broken brush block to be the issue. If this video was helpful or interesting to you, please subscribe and stay tuned for our upcoming video which explains all of the issues, fixes and hacks we've encountered over the four years we full-time RV'd with our QG5500!
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[@oidirk]

Really informative video. Thank you very much! I have an Onan Cummins generator in my 2022 Grand Design Momentum and it has been of basically no use since it was new. As the generator has a four year warranty, I had a site visit by a Cummins tech, well five site visits. They could not figure out what was wrong with it. Finally on the last visit, they replaced the carb as they thought the choke kept shutting (I was getting code 36, unexpected shutdown). Well, I was happy that they were able to fix it. But, one week later, it starting randomly shutting off again. By this time I was not in a location that had a Onan Cummins service center. So, that is where the generator sits now - does not run for more than 45 minutes. Sometimes it's 30, sometimes 20, sometime 5 minutes. My plan is to go back to Jacksonville FL and have them look at it again. But, your tip about the vapor lock makes sense. When my gen stops, it begins to surge like it is running out of fuel. I am for sure going to get some heat shield / wrap and give that a try - thanks again!!

[@LackeysBeTrippin]

Awesome thanks for the comment! Hopefully this helps! If not, the follow up video will have lots of other things for you to check. Onan really under-engineered these things but they're great with a few tweaks. 😁

[@toycarcollector]

When running the generator on this or any 5th wheel would you always keep the door open on the compartment? Seems like it should be open and even have a fan blowing on it.