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 |
|---|
| (K470) DEF PURGE VALVE SIGNAL CIRCUIT OPEN/HIGH RESISTANCE |
| (K421) DEF PURGE VALVE RETURN CIRCUIT OPEN/HIGH RESISTANCE |
| DEF SUPPLY PUMP ASSEMBLY |
| DEF DOSING CONTROL UNIT |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L .