P0780

DTC P0780: Mechanical Problem in Hydraulic Control System

NOTE:
^ Record all freeze data 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, D, 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 flowchart for the indicated code(s). Check for DTC P0780 after troubleshooting.
NO - Go to step 2.
2. Turn the ignition switch OFF.
3. Replace the A/T clutch pressure control solenoid valve A.
4. Replace the 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, 4th, and 5th gears in 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 P0780?
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, D 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, 4th, and 5th gears in 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 16.
NO - The problem has been corrected.
15. Check for warranty coverage.
Is the vehicle under warranty?
YES - Replace the transmission assembly.
NO - Go to step 16.
16. Turn the ignition switch OFF.
17. Remove the transmission, and overhaul transmission hydraulic control system.
18. Install the transmission on the vehicle.
19. Reset the PCM memory by removing the No. 6 ECU (15A) fuse in the under-hood fuse/relay box for more than 10 seconds.
20. Drive the vehicle for several minutes in 1st, 2nd, 3rd, 4th, and 5th gears in D position, and stop the vehicle. Do not stop the engine
21. Repeat step 20 five times
22. Recheck for DTC P0780.
Does the OBD II scan tool indicate code P0780?
YES - Replace the transmission assembly.
NO - The problem has been corrected.