DTC Troubleshooting

DTC Troubleshooting: P0957 (24)

DTC P0957: Short in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck ON

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information. How to Troubleshoot A/T Systems

- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

1. Turn the ignition switch to ON (II).

2. Shift to P.

3. Check the SS Mode Switch signal with the HDS in the A/T data list.

Is the SS Mode Switch ON?
YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time. Check the SS Mode Switch wire for an intermittent short to ground between the transmission gear selection switch and the PCM.


4. Turn the ignition switch to LOCK (0).

5. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector at the shift lever bracket.

6. Turn the ignition switch to ON (II).

7. Check the SS Mode Switch signal input with the HDS in the A/T data list.

Is the SS Mode Switch ON?
YES - Go to step 8.

NO - Replace the transmission gear selection switch, Transmission Gear Selection Switch Replacement then go to step 19.


8. Turn the ignition switch to LOCK (0).

9. Jump the SCS line with the HDS.

10. Disconnect PCM connector A (49P).

11. Check for continuity between transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector terminal No. 3 and body ground.

Is there continuity?
YES - Repair short in the wire between PCM connector terminal A47 and the transmission gear selection switch, then go to step 19.

NO - Go to step 12.






12. Reconnect all connectors.

13. Update the A/T software in the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. How to Troubleshoot A/T Systems

14. Start the engine in P, wait for at least 10 seconds, then shift to M.

15. Push the shift lever toward upshift position (+) slowly, and release it; repeat this test 10 times or more.

16. Pull the shift lever toward downshift position (-) slowly, and release it; repeat this test 10 times or more.

17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0957 indicated?
YES - If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then recheck. If the PCM was substituted, go to step 1.

NO - Go to step 18.


18. Monitor the OBD STATUS for P0957 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 17, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections and loose terminals at the transmission gear selection switch and the PCM. If the PCM was updated, substitute a known-good PCM, How to Troubleshoot A/T Systems then recheck. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, return to step 14 and recheck.


19. Clear the DTC with the HDS.

20. Start the engine in P, wait for at least 10 seconds, then shift to M.

21. Push the shift lever toward upshift position (+) slowly, and release it; repeat this test 10 times or more.

22. Pull the shift lever toward downshift position (-) slowly, and release it; repeat this test 10 times or more.

23. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0957 indicated?
YES - Check for poor connections and loose terminals at the transmission gear selection switch and the PCM, then go to step 1.

NO - Go to step 24.


24. Monitor the OBD STATUS for P0957 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 23, go to the indicated DTC's troubleshooting.

NO - If the HDS indicates FAILED, check for poor connections and loose terminals at the transmission gear selection switch and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, return to step 20 and recheck.