Possible Causes
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| LOW ENGINE COOLANT LEVEL |
| DEF LINE HEATER OR SUPPLY PUMP ASSEMBLY DTCS PRESENT |
| RESTRICTED OR LEAKING COOLANT LINES TO THE DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE |
| RESTRICTED OR LEAKING COOLANT LINES TO THE DIESEL EXHAUST FLUID TANK HEATER |
| DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE PHYSICALLY STUCK CLOSED |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L .
NOTE:
The DEF Line Heater monitor runs only when the DEF Line Heater Relay is commanded on. If the ambient temperature is too warm for the DEF Line Heaters to be turned on, the DTC will remain active and will not be able to be erased after repair is completed. Using the scan tool, navigate to Actuator Tests and actuate the Line Heater Relay test for the appropriate Line Heater to run the diagnostic and determine if the repair has been completed. If the repair is complete, the fault will move to stored and be able to be cleared with the scan tool.