DTC Troubleshooting
DTC Troubleshooting: P0977 (8)
DTC P0977:
Shift Solenoid Valve B (Open)
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information How To Troubleshoot The A/T System.
- 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
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 sport shift 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 sport shift 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.
Is there 12-25 Ohms?
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.
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 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.
Is there continuity?
YES -
Replace shift solenoid valve B Shift Solenoid Valve And Shift Solenoid Wire Harness Replacement, then go to step 23.
NO -
Replace the shift solenoid harness 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.
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 ECM/PCM Update, or substitute a known-good 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 sport shift 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, 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 Service and Repair. 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, 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 sport shift 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.