Tank gauges are prone to failure on black and grey tanks and even fresh water tanks. If you can get under the trailer and inspect the wiring you may find they just fell off, mis-wired, etc.
Or they may be gunked up and need cleaning. Many different ways people recommend that you can research. Or the sensor could just be broken. Did it show up full in pre-delivery? If it is a bad sensor it should be a warranty item.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
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