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 IF TRANSMISSION SOLENOID DTCS ARE PRESENT
With the scan tool, check for other transmission DTCs.

Are there any Transmission Solenoid DTCS present?

Yes
1. Refer to symptom test and perform the appropriate repair.
No
1. Go To step 2).
2) CHECK IF ABS DTCS ARE PRESENT
With the scan tool, check for ABS DTCs.

Are there any ABS DTCs present?

Yes
1. Refer to BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS and perform the appropriate symptom.
No
1. Go To step 3).
3) CHECK FOR INTERNAL TRANSMISSION PROBLEM
This DTC is usually set due to an internal transmission problem such as but not limited to: stuck solenoid valve and/or contamination in the valve body, broken springs, leaking clutch seals, dislodged or broken snap ring.

Inspect the internal transmission, Refer to SERVICE INFORMATION - NAG1 for the appropriate service procedure(s).

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to ELECTRONIC CONTROL MODULES - SERVICE INFORMATION for the appropriate service procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1 .