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DTC P0977: Shift Solenoid Valve B (Open)

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. 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.
  • Some wire colors vary according to the model year, and are indicated with an asterisk as follows:
    • *(1): '09 - 10 models
    • *(2): '11 - 12 models
  1. Clear the DTC with the HDS.
  2. Start the engine, and test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in D3, and let the transmission shift through all three gears. Drive the vehicle in 3rd gear for at least 1 second, then slow down to a stop.
    • Five-position transmission: Drive the vehicle in 1st thru 3rd gears in the sequential sportshift mode in S. Drive the vehicle in 3rd gear for at least 1 second, then slow down to a stop.
  3. Check that DTC P0977 recurs.

    Is DTC P0977 indicated? 

    YES  - go to step  7.

    NO  -Go to step 4.

  4. Select Shift Solenoid B in the Miscellaneous Test Menu, and test shift solenoid valve B with the HDS.

    Is a clicking sound heard? 

    YES  -Go to step 5.

    NO  - go to step  7.

  5. Start the engine, and test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 1st gear in D3 for at least 1 second, then press the accelerator pedal so that the transmission upshifts into 3rd gear, and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
    • Five-position transmission: Drive the vehicle in 1st gear in the sequential sportshift mode in S for at least 1 second, then upshift to 3rd gear by pulling the paddle shifter + (upshift switch), and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
  6. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate FAILED? 

    YES  -Go to step 7.

    NO  -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at shift solenoid valve B and the PCM. If the HDS indicates NOT COMPLETED, return to step  4 and recheck.

  7. Turn the ignition switch to LOCK (0).
  8. Jump the SCS line with the HDS.
  9. Disconnect PCM connector B (49P).
  10. Measure the resistance between PCM connector terminal B27 and body ground.
    Fig 1: Measuring Resistance Between PCM Connector Terminal B27 And Body Ground
    G06768387Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 12-25 Ω? 

    YES  - go to step  15.

    NO  -Go to step 11.

  11. Disconnect the shift solenoid harness connector.
  12. Check for continuity between PCM connector terminal B27 and shift solenoid harness connector terminal No. 2.
    Fig 2: Checking Continuity Between PCM Connector Terminal B27 And Shift Solenoid Harness Connector Terminal No. 2
    G06768388Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire between PCM connector terminal B27 and the shift solenoid harness connector, then go to step  23.

  13. Remove the shift solenoid harness (see SHIFT SOLENOID VALVE AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT ).
  14. Check for continuity between shift solenoid harness connector terminal No. 2 and the shift solenoid valve B connector terminal.
    Fig 3: Checking Continuity Between Shift Solenoid Harness Connector Terminal No. 2 And Shift Solenoid Valve B Connector Terminal
    G06768389Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Replace shift solenoid valve B (see SHIFT SOLENOID VALVE AND SHIFT SOLENOID WIRE HARNESS REPLACEMENT ), then go to step  23.

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

  15. Disconnect PCM connector A (49P).
  16. Turn the ignition switch to ON (II).
  17. Measure the voltage between PCM connector terminal A1 and body ground.
    Fig 4: Measuring Voltage Between PCM Connector Terminal A1 And Body Ground
    G06768390Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 18.

    NO  -Check for a blown No. 7 (10 A) fuse in the under-hood fuse/relay box. 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  23.

  18. Connect PCM connectors.
  19. Update the A/T software in the PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ).
  20. Test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 1st gear in D3 for at least 1 second, then press the accelerator pedal so that the transmission upshifts into 3rd gear, and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
    • Five-position transmission: Drive the vehicle in 1st gear in the sequential sportshift mode in S for at least 1 second, then upshift to 3rd gear by pulling the paddle shifter + (upshift switch), and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
  21. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0977 indicated? 

    YES  -If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the PCM was substituted, go to step  1.

    NO  -Go to step 22.

  22. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate PASSED? 

    YES  -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If any other DTCs were indicated on step 21, go to the indicated DTC's troubleshooting.

    NO  -Check for poor connections and loose terminals at shift solenoid valve B and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, return to step  20 and recheck.

  23. Reconnect all connectors.
  24. Clear the DTC with the HDS.
  25. Test-drive the vehicle:
    • Seven-position transmission: Drive the vehicle in 1st gear in D3 for at least 1 second, then press the accelerator pedal so that the transmission upshifts into 3rd gear, and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
    • Five-position transmission: Drive the vehicle in 1st gear in the sequential sportshift mode in S for at least 1 second, then upshift to 3rd gear by pulling the paddle shifter + (upshift switch), and drive in 3rd gear for at least 1 second. Slow down and stop the wheels.
  26. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0977 indicated? 

    YES  -Check for poor connections and loose terminals at shift solenoid valve B and the PCM, then go to step  1.

    NO  -Go to step 27.

  27. Monitor the OBD status for P0977 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate PASSED? 

    YES  -Troubleshooting is complete. If any other DTCs were indicated on step 26, go to the indicated DTC's troubleshooting.

    NO  -Check for poor connections and loose terminals at shift solenoid valve B and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, return to step  25 and recheck.

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