DTC Troubleshooting

DTC P0780: Shift Control System

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.

1. Check for other DTCs indicated simultaneous with DTC P0780.

NOTE: DTC P0780 means there is one or more A/T DTCs about the shift control system.

Are there other DTCs?

Yes - Troubleshoot indicated DTC(s):

^ Refer to P1730 P1730
^ Refer to P1731 P1731
^ Refer to P1732 P1732
^ Refer to P1733 P1733
^ Refer to P1734 P1734

No - Go to step 2.

2. Update the A/T software in the PCM if it does not have latest software, or substitute a known-good PCM.
3. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

Is DTC P0780 indicated?

Yes - If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, reinstall the original PCM, then go to step 1.

No - Go to step 4.

4. Monitor the OBD STATUS for P0780 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

Yes - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated on step 3, go to the indicated DTC's troubleshooting.

No - Check for poor connections and loose terminals at shift solenoid valves, A/T clutch pressure control solenoid valves, and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, reinstall the original PCM, then go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.