Cummins ISB4.5 CM2150 Fault Code: 1713 PID: SPN: 3363 FMI: 0 Aftertreatment Diesel Exhaust Fluid (DEF) Tank Heater – Data Valid But Above Normal Operating Range – Moderately Severe Level.

Circuit Description
The aftertreatment DEF tank heater keeps the DEF from freezing in the DEF tank. The tank heater consists of an electrically powered tank heater control valve that controls the flow of engine coolant to a heating coil inside the DEF tank. The tank heater control valve opens to allow coolant to flow to the heating coil when heating is commanded, and then closes when heating is no longer required.

Component Location
The DEF tank heater control valve is located near the DEF tank. Specific location will vary, depending on the vehicle original equipment manfacturer (OEM). The tank heating coil is internal to the DEF tank.

Conditions for Running the Diagnostics
This diagnostic runs continuously when DEF tank heating is being commanded.

Conditions for Setting the Fault Codes
The aftertreatment DEF tank heater is determined to be in the ON position when the engine contol module (ECM) is commanding the heater to be in the OFF position. This is done by detecting when the DEF tank temperature is equal to or greater than the fault code threshold value of 77°C [170°F].

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately after the diagnostic runs and fails.
-Engine torque will be reduced.

Conditions for Clearing the Fault Code
-This fault code can not be cleared with INSITE™ electronic service tool.
-To validate the repair, start the engine and let it idle until the coolant temperature is at operating temperature for 1 minute.
-The ECM will turn off the amber CHECK ENGINE lamp and/or MIL immediately after the diagnostic runs and passes.
-Use INSITE™ electronic service tool to verify the fault code is inactive.
-The inactive fault code will be cleared from the memory after 9600 hours of engine operation without a reoccurrence.

Shop Talk
Before troubleshooting this fault code, make sure the vehicle is not equipped with an auxiliary heating device for the DEF tank. Such a device can result in overheating the DEF in the tank.

This fault code may be inactive when the vehicle is brought in for service. Even if inactive, follow the troubleshooting tree completely.

-Reason: If there is a problem with the DEF tank heater control valve, the valve is stuck open, there is coolant leaking past the valve seat, or the valve is incorrectly installed, it can take long periods of operation at high load before the DEF tank temperature gradually increases to the fault code threshold value of 77°C [170°F]. As soon as the DEF temperature drops below 75°C [167°F] due to a stopped engine, overnight parking, reduced coolant temperature, and so forth, the fault code will go inactive, while the root cause of the issue is still present.

Possible Causes
-Aftertreatment DEF tank heater control valve stuck open
-Malfunctioning aftertreatment DEF tank heater control valve – stuck open or leakage past the valve seat.
-Malfunctioning aftertreatment DEF controller is continuously commanding tank heating.