Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR AN INTERNAL TRANSMISSION PROBLEM
This DTC is an informational DTC.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

This is usually a sign of Torque Converter Clutch failure or an internal transmission problem.

Check the Engine and Transmission Cooling Systems for proper operation.

View repair.

Repair
1. Repair internal Transmission, Torque Converter, and/or Transmission and Engine Cooling systems as necessary. Refer to SERVICE INFORMATION - NAG1 and/or COOLING for the appropriate service procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .