Learn what SPN 3217 FMI 20 means, its causes, and how to fix it. Follow our simple guide to resolve this issue and get your equipment back to full performance.
SPN 3217 FMI 20 indicates a low voltage signal in the Transmission Fluid Temperature Sensor Circuit. FMI 20 means that the ECM (Engine Control Module) has detected that the voltage from the sensor is below the expected range, which can affect the transmission's performance by causing incorrect fluid temperature readings.