On a 2018 you should have the one Control system. The 4 tanks (fresh, gray, black, & LP) are all sent to one module. If your LP is working power is being supplied to the tank monitor module which I believe is located under one of the drawers in the bedroom. You may have a problem with the actual sensors on the tanks (very common) or a loose common ground to the 3 tanks (unlikely). If you go to each individual tank you can jump a wire from the common (lowest sensor on the tank) to the three others, one at a time. if it is a sensor issue your panel will show a level corresponding to the sensor you have jumped to the common.
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2021 Newmar Baystar 3401
2019 Jeep Cherokee Trailhawk toad
2017.5 Forester 3051S Traded 7/2020
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