Automatic Transmission
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 to ON (II).
2. Shift to M.
3. Check the SS MODE SWITCH in the DATA LIST with the HDS.
Is the SS MODE SWITCH OFF?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals 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.
6. Check for continuity between transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector terminals No. 2 and No. 3.
Is there continuity when the shift lever is in M, 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 to ON (II).
8. Measure the voltage between transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector terminal No. 3 and body ground.
Is there battery voltage?
YES - Repair open in the wire between transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector terminal No. 2 and ground (G503), or repair poor ground (G503), then go to step 10.
NO - Go to step 9.
9. Measure the voltage between PCM connector terminal E30 and body ground.
Is there battery voltage?
YES - Repair open in the wire between PCM connector terminal E30 and the transmission gear selection switch/park pin switch/A/T gear position indicator panel light connector, then go to step 10.
NO - Go to step 18.
10. Reconnect all connectors.
11. Turn the ignition switch to ON (II).
12. Clear the DTC with the HDS.
13. Start the engine in P, wait for at least 10 seconds, then press the brake pedal and shift to M.
14. Push the shift lever toward upshift position slowly, and return to neutral position; repeat this test at least 10 times.
15. Pull the shift lever toward downshift position slowly, and return to neutral position; repeat this test at least 10 times.
16. Check for DTCs with the HDS.
Is DTC P0958 indicated?
YES - Check for poor connections or loose terminals between 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. If any other DTCs were indicated in step 16, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals between the transmission gear selection switch and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 13.
18. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
19. Start the engine in P, wait for at least 10 seconds, then press the brake pedal and shift to M.
20. Push the shift lever toward upshift position (+) slowly, and return to neutral position; repeat this test at least 10 times.
21. Pull the shift lever toward downshift position slowly, and return to neutral position; repeat this test at least 10 times.
22. Check for DTCs with the HDS.
Is DTC P0958 indicated?
YES - Check for poor connections or loose terminals between 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 - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated in step 22, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals between 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. If the screen indicates NOT COMPLETED, go to step 19.