Possible Causes
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| DEF PRESSURE LINE HEATER SUPPLY CIRCUIT SHORTED TO ANOTHER VOLTAGE SUPPLY |
| DEF PRESSURE LINE HEATER RETURN CIRCUIT SHORTED TO ANOTHER VOLTAGE SUPPLY |
| DEF PRESSURE LINE HEATER |
| DEF DOSING CONTROL UNIT |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE
NOTE:
One of the DEF Line Heater monitors 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 may remain active and may not be able to be erased after repair is completed. Using the scan tool, navigate to Actuator Tests and actuate the DEF Reductant Pressure Line Heater 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.