Possible Causes
WARNING: This page is about a different variant/trim than selected.
| Possible Causes |
|---|
| OTHER SCR, REDUCTANT, OR NOX DTCS PRESENT |
| EXHAUST SYSTEM LEAK |
| DEF CONTAMINATION OR LEAK |
| DEF SUPPLY LINE RESTRICTION |
| SCR CATALYST |
| DEF INJECTOR |
| DEF SUPPLY PUMP |
| DAMAGED DIESEL PARTICULATE FILTER (DPF) |
| NOX SENSORS |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .