What does the 3363+16 fault code mean?

[DiBrody]

3363+16 fault code indicates that the Catalyst 1 Tank Heater Circuit is too high. 1. Causes: Coolant pipe direction reversed, tank heater control valve reversed, aftertreatment fluid level temperature sensor reversed; tank heating valve stuck open; incorrect heating valve model used. 2. Solutions: Check whether the coolant pipe, tank heater control valve and aftertreatment fluid level temperature sensor are reversed; perform "Diesel Engine Urea Injection System Heater Test" to check if the tank heating valve is functioning properly. If blockage or mechanical failure is found, repair or replace the heating valve. Check whether the tank heating valve model matches the ECM model.