DTC P1780: Shift Control System (Transmission Default Mode)

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 caused by a hydraulic control system problem (DTCs P1746 and P1747), and stored simultaneously with DTC P1746 and/or P1747.

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. Then slow down to a stop.
Check whether the DTC P1746 or P1747 is indicated in the DTCs/Freeze Data in A/T Mode Menu with the HDS.
Is DTC P1746 or P1747 indicated?

YES -
- Troubleshoot DTC P1746 (see DTC P1746: HYDRAULIC CONTROL SYSTEM (CUT VALVE A STUCK OFF OR CUT VALVE B STUCK ON); DTC P1747: HYDRAULIC CONTROL SYSTEM (CUT VALVE A STUCK ON OR CUT VALVE B STUCK OFF) ).
- Troubleshoot DTC P1747 (see DTC P1746: HYDRAULIC CONTROL SYSTEM (CUT VALVE A STUCK OFF OR CUT VALVE B STUCK ON); DTC P1747: HYDRAULIC CONTROL SYSTEM (CUT VALVE A STUCK ON OR CUT VALVE B STUCK OFF) ).
NO -Intermittent failure, the system is OK at this time.