Possible Causes
WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| MODULE SOFTWARE UPDATE NOT COMPATIBLE WITH SCR CATALYST |
| FUSED IGNITION SWITCH CIRCUIT OPEN/HIGH RESISTANCE |
| AMMONIA SENSOR MODULE GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| J1939 DATALINK (+) CIRCUIT OPEN/HIGH RESISTANCE |
| J1939 DATALINK (-) CIRCUIT OPEN/HIGH RESISTANCE |
| J1939 DATALINK (+) CIRCUIT SHORTED TO BATTERY OR GROUND |
| J1939 DATALINK (-) CIRCUIT SHORTED TO BATTERY OR GROUND |
| J1939 DATALINK (+) CIRCUIT SHORTED TO ANOTHER CIRCUIT |
| J1939 DATALINK (-) CIRCUIT SHORTED TO ANOTHER CIRCUIT |
| J1939 DATALINK COMPONENT INTERNALLY SHORTED |
| AMMONIA SENSOR MODULE |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .