DTC Troubleshooting
DTC Troubleshooting: P0812
DTC P0812:
Open in Transmission Range Switch ATPR Switch Circuit
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes.
- 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 R, and check the A/T R Switch with the HDS in the A/T Data List.
Is the A/T R Switch ON?
YES -
Intermittent failure, the system is OK at this time.�
NO -
Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the transmission range switch connector.
5. Turn the ignition switch to ON (II).
6. Measure the voltage between transmission range switch connector terminals No. 7 and No. 10.
Is there more than 5 V?
YES -
Go to step 7.
NO -
Repair an open in the wire between PCM connector terminal B14 and the transmission range switch, then go to step 8.
7. Check for continuity between transmission range switch connector terminals No. 7 and No. 10 when the shift lever is in R, and when the shift lever is shifted to any position other than R.
Is there continuity when the shift lever is in R, and no continuity when the shift lever is shifted to any position other than R?
YES -
Go to step 14.
NO -
Replace the transmission range switch, then go to step 8.
8. Reconnect all connectors.
9. Turn the ignition switch to ON (II).
10. Clear the DTC with to the HDS.
11. Test-drive the vehicle with the shift lever in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then increase the speed and drive over 3 mph (5 km/h) for at least 2 seconds.
12. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0812 indicated?
YES -
Check for poor connections or loose terminals between the transmission range switch and the PCM, then go to step 1.
NO -
Go to step 13.
13. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the transmission range switch and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 11.
14. Reconnect all connectors.
15. Update the PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good PCM.
16. Test-drive the vehicle with the shift lever in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then increase the speed and drive over 3 mph (5 km/h) for at least 2 seconds.
17. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0812 indicated?
YES -
Check for poor connections or loose terminals between the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 16. If the PCM was substituted, go to step 1.
NO -
Go to step 18.
18. Monitor the OBD STATUS for P0812 in the DTCs MENU with the HDS.
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 Pending or Confirmed DTCs were indicated in step 17, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 16. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 16.