J1939 SPN 3522 — Body/Chassis parameter

What it means

SPN 3522 typically refers to an Aftertreatment or Body Control parameter out of range or a communication error related to the vehicle integration system. In many chassis/engine configurations (like Paccar or Cummins), it indicates an issue with the Selective Catalytic Reduction (SCR) fluid tank level sensor signal or a general Body Controller hardware fault.