DTC Troubleshooting: P1780 (49-1)

DTC P1780:  Problem in Shift Control System

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

1.Clear the DTC with the HDS.

2.Test-drive the vehicle for several minutes in the D position through all five gears, then slow down to a stop.

3.Retest-drive the vehicle for several minutes in the D position through all five gears, then slow down to a stop.

4.Check for other DTCs indicated simultaneous with the code P1780.

NOTE: DTC P1780 means there is one or more A/T DTCs about the shift control system.

Are there other DTCs?


YES - Troubleshoot a problem as indicated by the DTC.n


NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original  PCM.n