DTC P0780: Shift Control System

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).
This code is stored whenever DTCs P1730, P1731, P1732, P1733, or P1734 are detected.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears.
Check for other Temporary DTCs or DTCs indicated along with DTC P0780.
NOTE: DTC P0780 means there is one or more A/T DTCs regarding the shift control system.

Are there other DTCs?

YES -Go to the indicated DTC's troubleshooting.
- P1730 (see DTC P1730:PROBLEM IN SHIFT CONTROL SYSTEM: )
- P1731 (see DTC P1731:PROBLEM IN SHIFT CONTROL SYSTEM: )
- P1732 (see DTC P1732:PROBLEM IN SHIFT CONTROL SYSTEM: )
- P1733 (see DTC P1733:PROBLEM IN SHIFT CONTROL SYSTEM: )
- P1734 (see DTC P1734:PROBLEM IN SHIFT CONTROL SYSTEM: )
NO -Go to step 5.
Update the PCM if it does not have latest software (see ECM/PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ).
Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0780 indicated?

YES -If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 6. If the PCM was substituted, go to step 1.

NO -Go to step 8.
Monitor the OBD STATUS for P0780 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.

NO -If the PCM was updated and HDS indicates FAILED, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 6. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 6.