P0780

DTC P0780: Mechanical Problem in Hydraulic Control System

NOTE:
^ Record all freeze data and review General Troubleshooting Information before you troubleshoot.
^ Keep replacement solenoid valves on hand;
- A/T clutch pressure control solenoid valves A, B, and C
- Shift solenoid valves A, B, C, and E

1. Check whether the OBD II scan tool indicates another code.
Does the OBD II scan tool indicate another code?
YES - Perform the troubleshooting for the indicated code(s). Check for DTC P0780 after troubleshooting.
NO - Go to step 2.
2. Turn the ignition switch OFF.
3. Replace A/T clutch pressure control solenoid valve A.
4. Replace A/T clutch pressure control solenoid valves B and C.
5. Reset the PCM memory by removing the No. 6 ECU (15A) fuse in the under-hood fuse/relay box for more than 10 seconds.
6. Drive the vehicle for several minutes in 1st, 2nd, 3rd, and 4th gears in the D position, and stop the vehicle. Do not stop the engine
7. Repeat step 6 five times.
8. Recheck for DTC P0780.
Does the OBD II scan tool indicate code P07S0?
YES - Go to step 9.
NO - The problem has been corrected.
9. Turn the ignition switch OFF.
10. Replace the shift solenoid valves A, B, C, and E.
11. Reset the PCM memory by removing the No. 6 ECU (15A) fuse in the under-hood fuse/relay box for more than 10 seconds.
12. Drive the vehicle for several minutes in 1st, 2nd, 3rd, and 4th gears in the D position, and stop the vehicle. Do not stop the engine
13. Repeat step 12 five times.
14. Recheck for DTC P0780.
Does the OBD II scan tool indicate code P0780?
YES - Go to step 15.
NO - The problem has been corrected.
15. Turn the ignition switch OFF.
16. Remove the transmission, and overhaul transmission hydraulic control system.
17. Install the transmission on the vehicle.
18. Reset the PCM memory by removing the No. 6 ECU (15A) fuse in the under-hood fuse/relay box for more than 10 seconds.
19. Drive the vehicle for several minutes in 1st, 2nd, 3rd, and 4th gears in the D position, and stop the vehicle. Do not stop the engine
20. Repeat step 19 five times
21. Recheck for DTC P0780.
Does the OBD II scan tool indicate code P0780?
YES - Replace the transmission assembly.
NO - The problem has been corrected.