Possible Causes
WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
| Possible Causes |
|---|
| (T77) SHIFT PRESSURE CONTROL CIRCUIT OPEN |
| (T77) SHIFT PRESSURE CONTROL CIRCUIT SHORTED TO GROUND |
| (T77) SHIFT PRESSURE CONTROL CIRCUIT SHORTED TO ANOTHER CIRCUIT |
| SHIFT PRESSURE SOLENOID |
| TRANSMISSION CONTROL MODULE (TCM) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .