Possible Causes
WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| DEF LINE HEATER SUPPLY CIRCUIT SHORT TO VOLTAGE |
| DEF LINE HEATER ASSEMBLY |
| DEF HEATER CONTROL UNIT (HCU) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .