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DTC P0979: Shift Solenoid Valve C (Short)

WARNING: This page is about a different car, the 2013 Honda Odyssey, 2012 Honda Odyssey, and 2011 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  • This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
  • Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION .

Keihin PCM 

  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0979 indicated? 

    YES  -Go to step  8.

    NO  -Go to step 5.

  5. Select Shift Solenoid Valve C in the Miscellaneous Test Menu, and test shift solenoid valve C with the HDS.

    Is a clicking sound heard? 

    YES  -Go to step 6.

    NO  -Go to step  8.

  6. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.
  7. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate FAILED? 

    YES  -Go to step 8.

    NO  -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM. If the HDS indicates NOT COMPLETED, go to step  5.

  8. Check for a blown No. B5 (7.5 A) fuse in the under-hood fuse/relay box.

    Is the No. B5 (7.5 A) fuse OK? 

    YES  -Go to step 9.

    NO  -Replace the fuse, then go to step  21. If the fuse blows again, repair short in the B5 (7.5 A) fuse circuit. Then go to step  21.

  9. Turn the ignition switch to LOCK (0).
  10. Jump the SCS line with the HDS.
  11. Disconnect PCM connector C (49P).
  12. Measure the resistance between PCM connector terminal C9 body ground.
    Fig 1: Measuring Resistance Between PCM Connector Terminal C9 Body Ground
    G06966898Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 12 Ω? 

    YES  -Go to step 13.

    NO  -Go to step  26.

  13. Disconnect the shift solenoid wire harness connector.
  14. Check for continuity between PCM connector terminal C9 and body ground.
    Fig 2: Checking Continuity Between PCM Connector Terminal C9 And Body Ground
    G06966899Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between PCM connector terminal C9 and the shift solenoid wire harness connector, then go to step  20.

    NO  -Go to step 15.

  15. Inspect shift solenoid valve C (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT  ).

    Is shift solenoid valve C OK? 

    YES  -Go to step 16.

    NO  -Replace shift solenoid valve C or the shift solenoid wire harness (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT  ), then go to step  23.

  16. Jump the SCS line with the HDS
  17. Disconnect PCM connector A (49P).
  18. Turn the ignition switch to ON (II).
  19. Measure the voltage between PCM connector terminal A1 and body ground.
    Fig 3: Measuring Voltage Between PCM Connector Terminal A1 And Body Ground
    G06966900Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  26.

    NO  -Check for a blown No. B5 (7.5 A) fuse in the under-hood fuse/relay box. If the fuse is blown, replace it. If the fuse blows again, repair a short in the No. B5 (7.5 A) fuse circuit. If the fuse is OK, repair an open in the wire between PCM connector terminal A1 and the under-hood fuse/relay box, then go to step 20.

  20. Reconnect all connectors.
  21. Turn the ignition switch to ON (II).
  22. Clear the DTC with the HDS.
  23. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 1st gear for at least 1 second. Slow down, and stop the wheels.
  24. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0979 indicated? 

    YES  -Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM, then go to step  1.

    NO  -Go to step 25.

  25. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  24, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, go to step  23.

  26. Reconnect all connectors.
  27. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  28. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 1st gear for at least 1 second. Slow down, and stop the wheels.
  29. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0979 indicated? 

    YES  -Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  28. If the PCM was substituted, go to step  1.

    NO  -Go to step 30.

  30. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step  29, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for shift solenoid valve C and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  28. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, go to step  28.



NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  • This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
  • Check the label on the PCM to see if it was made by Keihin or Continental. Refer to the GENERAL TROUBLESHOOTING INFORMATION .

Continental PCM 

  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0976 or P0979 indicated? 

    YES  -If DTC P0976 is indicated, go to DTC P0976: Shift Solenoid Valve B (Short) . If DTC P0979 is indicated, go to step  8.

    NO  -Go to step 5.

  5. Select Shift Solenoid Valve C in the Miscellaneous Test Menu, and test shift solenoid valve C with the HDS.

    Is a clicking sound heard? 

    YES  -Go to step 6.

    NO  -Go to step  8.

  6. Start the engine, and run the vehicle in 1st gear in D for at least 1 second.
  7. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate FAILED? 

    YES  -Go to step 8.

    NO  -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM. If the HDS indicates NOT COMPLETED, go to step  5.

  8. Turn the ignition switch to LOCK (0).
  9. Jump the SCS line with the HDS.
  10. Disconnect PCM connector C (49P).
  11. Measure the resistance between PCM connector terminal C39 and body ground.
    Fig 1: Measuring Resistance Between PCM Connector Terminal C39 And Body Ground
    G00522717Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 12 Ω? 

    YES  -Go to step 12.

    NO  -Go to step  21.

  12. Disconnect the shift solenoid wire harness connector.
  13. Check for continuity between PCM connector terminal C39 and body ground.
    Fig 2: Checking Continuity Between PCM Connector Terminal C39 And Body Ground
    G00522717Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between PCM connector terminal C39 and the shift solenoid wire harness connector, then go to step  15.

    NO  -Go to step 14.

  14. Inspect shift solenoid valve C (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT  ).

    Is shift solenoid valve C OK? 

    YES  -Go to step  21.

    NO  -Replace shift solenoid valve C or the shift solenoid wire harness (see SHIFT SOLENOID VALVE TEST, REPLACEMENT, AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT  ), then go to step  18.

  15. Reconnect all connectors.
  16. Turn the ignition switch to ON (II).
  17. Clear the DTC with the HDS.
  18. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 1st gear for at least 1 second. Slow down, and stop the wheels.
  19. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0979 indicated? 

    YES  -Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM, then go to step  1.

    NO  -Go to step 20.

  20. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  19, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, go to step  18.

  21. Reconnect all connectors.
  22. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  23. Start the engine in P, wait for at least 1 second, then test-drive the vehicle in D. Drive the vehicle in 1st gear for at least 1 second. Slow down, and stop the wheels.
  24. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0979 indicated? 

    YES  -Check for an intermittent short to body ground in the wire between shift solenoid valve C and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to  23. If the PCM was substituted, go to step  1.

    NO  -Go to step 25.

  25. Monitor the OBD status for P0979 in the DTCs MENU with the HDS.

    Does the HDS indicate PASSED? 

    YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step  24, go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -If the HDS indicates FAILED, check for shift solenoid valve C and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 23. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, go to step  23.

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