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 |
|---|
| (K422) DEF PRESSURE SENSOR SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND |
| (K423) DEF PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| (K423) DEF PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K424) DEF PRESSURE SENSOR GROUND CIRCUIT |
| DIESEL EXHAUST FLUID SUPPLY PUMP |
| DIESEL EXHAUST FLUID DOSING CONTROL UNIT |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE - 6.7L .