DTC P1744: Shift Error

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).

Warm up the engine to normal operating temperature (the radiator fan comes on).
Make sure that the transmission is filled to the proper level, and check for fluid leaks.
Drain the ATF (see step 4 on ) through a strainer. Inspect the strainer for metal debris or excessive clutch material.
Does the strainer have metal debris or excessive clutch material?

YES -Replace the transmission, then go to step 7.

NO -Replace the ATF (see step 6 on ), then go to step 4.
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.
Monitor the OBD STATUS for P1744 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate FAILED?

YES -Repair shift valve E in the main valve body (see MAIN VALVE BODY DISASSEMBLY, INSPECTION, AND REASSEMBLY ), replace the main valve body, or replace the transmission, then go to step 7.

NO -Intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, return to step 4 and recheck.
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.
Monitor the OBD STATUS for P1744 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the HDS indicate PASSED?

YES -Troubleshooting is complete.

NO -Return to step 4 and recheck. If the HDS indicates NOT COMPLETED, return to step 88 and recheck.