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 |
|---|
| (K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN |
| (Z908) O2 2/2 HEATER GROUND CIRCUIT OPEN |
| (K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE |
| 2/2 O2 SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .