Possible Causes
| Possible Causes |
|---|
| ENGINE BRAKE DTCS PRESENT |
| (K321) BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) CONTROL CIRCUIT SHORT TO GROUND |
| (K321) BTSI CONTROL CIRCUIT OPEN |
| (K321) BTSI CONTROL CIRCUIT SHORTED TO VOLTAGE |
| WIRELESS IGNITION NODE (WIN) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .