Possible Causes
| Engine Overspeed Limit (If Equipped) | |
|---|---|
| 3.0 L (Diesel) | 4350 + 800 rpm |
| 3.5 L | 6400 + 500 rpm |
| 3.7 L | 6000 + 500 rpm |
| 4.0 L | 6000 + 500 rpm |
| 5.7 L | 5600 + 500 rpm |
| 6.1L | 6200 + 500 rpm |
| Possible Causes |
|---|
| MECHANICAL ENGINE PROBLEM |
| MECHANICAL TRANSMISSION PROBLEM |
| POWERTRAIN CONTROL MODULE |
| TRANSMISSION CONTROL MODULE |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to STANDARD PROCEDURE .