DTC Troubleshooting
DTC P0958: Open in Transmission Gear Selection Switch Circuit, or Transmission Gear Selection Switch Stuck OFFNOTE:
- 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. Turn the ignition switch ON (II).
2. Shift to the M position.
3. 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 OFF?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at 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. Check for continuity between transmission gear selection switch connector terminals No. 2 and No. 3.
Is there continuity when the shift lever is in the M position, and no continuity when the shift lever is in any position other than M?
YES - Go to step 7.
NO - Replace the transmission gear selection switch, then go to step 10.
7. Turn the ignition switch ON (II).
8. Measure voltage between transmission gear selection switch connector terminal No. 3 and body ground.
Is there battery voltage?
YES - Repair an open in the wire between transmission gear selection switch connector terminal No. 2 and ground (G503), or repair a poor ground (G503), then go to step 10.
NO - Go to step 9.
9. Measure voltage between PCM connector terminal E30 and body ground.
Is there battery voltage?
YES - Repair an open in the wire between PCM connector terminal E30 and the transmission gear selection switch connector, then go to step 10.
NO - Go to step 18.
10. Reconnect all connectors.
11. Turn the ignition switch ON (II).
12. Clear the DTC with the HDS.
13. Start the engine in the P position, wait for more than 10 seconds, then shift position to the M position.
14. Push the shift lever toward the upshift position (+) slowly, and release it; repeat this test 10 times or more.
15. Pull the shift lever toward the downshift position (-) slowly, and release it; repeat this test 10 times or more.
16. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0958 indicated?
YES - Check for poor connections or loose terminals at the transmission gear selection switch and the PCM, then go to step 1.
NO - Go to step 17.
17. Monitor the OBD STATUS for P0958 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.
18. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
19. Start the engine in the P position, wait for more than 10 seconds, then shift position to the M position.
20. Push the shift lever toward the upshift position (+) slowly, and release it; repeat this test 10 times or more.
21. Pull the shift lever toward the downshift position (-) slowly, and release it; repeat this test 10 times or more.
22. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0958 indicated?
YES - Check for poor connections or loose terminals at the transmission gear selection switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 19. If the PCM was substituted, go to step 1.
NO - Go to step 23.
23. Monitor the OBD STATUS for P0958 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - Return to step 1 and recheck.