This bulletin applies to 2012 Dodge Durango models. Customers may indicate that the MIL is illuminated and/or the transmission went into limp-in mode. Upon further investigation, DTC P0730 (incorrect gear ratio) is either active or stored in PCM memory.
If the customer describes the condition, inspect the transmission fluid for level and contamination. If level was incorrect or you find fluid contamination, repair as necessary. If not, perform the following reflash procedure.
Install a battery charger to ensure that battery voltage does not drop below 13.2 volts or climb above 13.5 volts during the flash process.
1. Reprogram the TCM with the latest software.
a. Connect the wiTECH VCI pod to the vehicle data link connector under the steering column.
b. Place the ignition in the RUN position.
c. Open the wiTECH diagnostic application.
d. Starting at the “Select Tool” screen, select the row/tool for the wiPOD device you are using.
e. Enter your User ID and password, then select OK.
f. Select the “Next” tab at the bottom of the screen.
g. From the “Vehicle View” screen, click on the TCM icon.
h. From the TCM View screen, select the “Flash” tab. Compare the “Current TCU Flash Number” with the “New Part Number” listed on the “sort table.” If the current TCU flash number is the same as the new part number, the TCM is up to date and further diagnosis is required. If the part numbers are not the same, continue with the next step.
i. With the cursor over the desired flash file, click the small green arrow button on the right side of the screen.
j. From the “ECU Flash” screen, follow the wiTECH screen instructions to complete the flash.
k. Once the flash is complete, click the “OK” button on the ECU Flash screen.
l. After TCM reprogramming, clear any DTCs that may have set in other modules.