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Home >> Acura >> 2002 >> RSX Base, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission >> DTC Troubleshooting >> DTC P0780: Mechanical Problem in Hydraulic Control System >> 2002-2004 Models

2002-2004 Models

NOTE:
  • Record all freeze data and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION  ) before you troubleshoot.
  • This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
  • 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. Warm up the engine to normal operating temperature (the radiator fan comes on).
  2. Check to be sure that the transmission is filled to the proper level, and check for fluid leaks.
  3. Drain the ATF (see ATF REPLACEMENT  ) through a strainer. Inspect the strainer for metal debris or excessive clutch material.

    Does the strainer contain metal debris or excessive clutch material? 

    1. YES -  Replace the transmission.
    2. NO -  Replace the ATF (see ATF REPLACEMENT  ), then go to step 4.
  4. Reset the PCM memory by removing the No. 6 ECU (15 A) fuse in the underhood fuse/relay box for more than 10 seconds (see PCM RESET PROCEDURES  ).
  5. Drive the vehicle for several minutes in 1st, 2nd, 3rd, 4th, and 5th gears in the D position, and stop the vehicle. Do not stop the engine.
  6. Repeat step  5 five times.
  7. Recheck for DTC P0780.

    Does the scan tool or the HDS indicate code P0780? 

    1. YES -  Go to step 8.
    2. NO -  The problem has been corrected.
  8. Turn the ignition switch OFF.
  9. Check whether the scan tool or the HDS indicates another code.

    Does the scan tool or the HDS indicate another code? 

    1. YES -  Perform the troubleshooting for the indicated code(s). Check for DTC P0780 after troubleshooting.
    2. NO -  Go to step 10.
  10. Turn the ignition switch OFF.
  11. Replace the A/T clutch pressure control solenoid valve A (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A REPLACEMENT  ).
  12. Replace the A/T clutch pressure control solenoid valves B and C (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE B AND C REPLACEMENT  ).
  13. Reset the PCM memory by removing the No. 6 ECU (15 A) fuse in the underhood fuse/relay box for more than 10 seconds (see PCM RESET PROCEDURES  ).
  14. Drive the vehicle for several minutes in 1st, 2nd, 3rd, 4th, and 5th gears in the D position, and stop the vehicle. Do not stop the engine.
  15. Repeat step  14 five times.
  16. Recheck for DTC P0780.

    Does the scan tool or the HDS indicate code P0780? 

    1. YES -  Go to step 17.
    2. NO -  The problem has been corrected.
  17. Turn the ignition switch OFF.
  18. Replace the shift solenoid valves A, B, C, D, and E (see SHIFT SOLENOID VALVE REPLACEMENT  ).
  19. Reset the PCM memory by removing the No. 6 ECU (15 A) fuse in the underhood fuse/relay box for more than 10 seconds (see PCM RESET PROCEDURES  ).
  20. Drive the vehicle for several minutes in 1st, 2nd, 3rd, 4th, and 5th gears in the D position, and stop the vehicle. Do not stop the engine.
  21. Repeat step  20 five times.
  22. Recheck for DTC P0780.

    Does the scan tool or the HDS indicate code P0780? 

    1. YES -  Go to step 23.
    2. NO -  The problem has been corrected.
  23. Check for warranty coverage.

    Is the vehicle under warranty? 

    1. YES -  Replace the transmission assembly.
    2. NO -  Go to step 24 or replace the transmission assembly.
  24. Turn the ignition switch OFF.
  25. Remove the transmission, and overhaul transmission hydraulic control system.
  26. Install the transmission on the vehicle.
  27. Reset the PCM memory by removing the No. 6 ECU (15 A) fuse in the underhood fuse/relay box for more than 10 seconds (see PCM RESET PROCEDURES  ).
  28. Drive the vehicle for several minutes in 1st, 2nd, 3rd, 4th, and 5th gears in the D position, and stop the vehicle. Do not stop the engine.
  29. Repeat step  28 five times.
  30. Recheck for DTC P0780.

    Does the scan tool or the HDS indicate code P0780? 

    1. YES -  Replace the transmission assembly.
    2. NO -  The problem has been corrected.
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