Note also that you can throw codes when there's a dirty connection that's intermittently open circuiting. Requires climbing under the RV and chasing out the wiring for it as it will likely go to another several other junction boxes with connectors. Those should all be checked. Since they tend to be automotive type connectors, I usually just wipe off all the dust and dirt, then partially disconnect and reconnect a few times in order to burnish the contacts. Saves getting any grime inside. I always use a strong light and carefully check the wiring all the way from one point to the next too.
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