P0957
DTC P0957: Short in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck ONNOTE:
^ Record all freeze data and review General Troubleshooting Information before you troubleshoot.
^ 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 ON (II).
2. Shift to the P position.
3. Verify the transmission gear selection switch sequential sportshift mode switch signal inputs with the HDS in the A/T data list.
Is sequential sportshift mode SW ON?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time. Check the S-MODE (PUR) wire for an intermittent short to ground between the transmission gear selection switch and the PCM.
4. Turn the ignition switch OFF.
5. Disconnect the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector.
6. Verify the transmission gear selection switch sequential sportshift mode switch signal input with the HDS in the A/T data list.
Is sequential sportshift mode SW ON?
YES - Go to step 7.
NO - Replace the transmission gear selection switch, then go to step 11
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector E (31P).
10. Check for continuity between transmission gear selection switch connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between PCM connector terminal E30 and the transmission gear selection switch, then go to step 11.
NO - Check for loose or poor connections at PCM connector terminal E30. If the connection is OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
11. Clear the DTC with the HDS.
12. Start the engine in the P position, wait for more than 10 seconds, then shift to the M position.
13. Push the shift lever toward the upshift position slowly, and release it; repeat this test 10 times or more.
14. Pull the shift lever toward the downshift position (-) slowly, and release it; repeat this test 10 times or more.
15. Monitor the OBD status for P0957 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.
Does the result indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.