CAT 3406E (Prefix 1MM or 2WS) Fault Code: 65 PID: SPN: 174 FMI: 0 High Fuel Temperature Warning

The Engine Control Module (ECM) detects the following conditions:

•The fuel temperature is above 90 °C (194 °F) for more than 30 seconds.
•The engine has been running for at least three minutes.

This is a warning code only, no troubleshooting is needed.