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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - REMOVAL) and/or (Refer to COOLING - DIAGNOSIS AND TESTING)
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
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