Firefly TruTank error code Status: Invalid
TruTank diagnostic menu shows the sensor reading as Invalid. Per Forest River TSB 225-1396 (Firefly remedy): double-check the J11 pinout at the G12 board, check the wiring at the TruTank sensor (on that coach: red-to-yellow, black-to-blue), and check the sensor is plumb within +/- 5 degrees.
What to check, and in what order, is in the app. The flow Firefly TruTank - tank not reading, invalid (blue line) or wrong level walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Forest River TSB 225-1396 - TruTank holding tank monitor (2021 Coachmen Nova Class B) remedy instructionsForest River, Inc. / Firefly Integrations (NHTSA archive)
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