DTC Troubleshooting
DTC P0977: Open in Shift Solenoid Valve B CircuitNOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information.
- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Clear the DTC with the HDS.
2. Test-drive the vehicle for several minutes in the D position through all five gears.
3. Check that DTC P0977 recurs.
Is DTC P0977 indicated?
YES - Go to step 7.
NO - Go to step 4.
4. Choose SHIFT SOLENOID B in MISCELLANEOUS TEST MENU, and test SHIFT SOLENOID VALVE B with the HDS.
Is the system normal?
YES - Go to step 5.
NO - Go to step 7.
5. Test-drive the vehicle for several minutes in the D position through all five gears.
6. Monitor the OBD STATUS for P0977 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 7.
NO - If the screen indicates PASSED, 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 screen indicates NOT COMPLETED, return to step 4 and recheck.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connectors A (31P), B (24P), and C (22P).
10. Measure resistance between PCM connector terminals C8 and A3 or B15.
Is there 12-25 Ohms?
YES - Go to step 21.
NO - Go to step 11.
11. Disconnect the solenoid harness connector.
12. Check for continuity between PCM connector terminal C8 and solenoid harness connector terminal No. 4.
Is there continuity?
YES - Go to step 13.
NO - Repair an open in the wire between PCM connector terminal C8 and the solenoid harness connector, then go to step 15.
13. Remove the solenoid harness connector.
14. Check for continuity between solenoid harness connector terminal No. 4 and the shift solenoid valve B connector terminal.
Is there continuity?
YES - Replace shift solenoid valve B, then go to step 15.
NO - Replace the solenoid harness, then go to step 15.
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Clear the DTC with the HDS.
18. Test-drive the vehicle for several minutes in the D position through all five gears.
19. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0977 indicated?
YES - Check for poor connections or loose terminals at shift solenoid valve B and the PCM, then go to step 1.
NO - Go to step 20.
20. Monitor the OBD STATUS for P0977 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 7 and recheck.
21. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
22. Test-drive the vehicle for several minutes in the D position through all five gears.
23. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0977 indicated?
YES - Check for poor connections or loose terminals at shift solenoid valve B and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 22. If the PCM was substituted, go to step 1.
NO - Go to step 24.
24. Monitor the OBD STATUS for P0977 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 7 and recheck.