P0217 is the generic OBD-II code for Engine Over Temperature Condition or Engine Coolant Over Temperature Condition. Manufacturer and service references describe it as a code set when the ECM detects that coolant temperature has reached an overheat threshold. Hino’s service manual states P0217 is issued when an over temperature condition is detected, and another published reference notes the code is triggered at about 110°C / 230°F on that application.

