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DTC P0812: Open in Transmission Range Switch ATP R Switch Circuit

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • 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 R, and check the A/T R SWITCH signal 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. Check for continuity between transmission range switch connector terminal No. 10 and body ground.
    Fig 1: Checking Continuity Between Transmission Range Switch Connector Terminal No. 10 And Body Ground
    G05455236

    Is there continuity? 

    YES  - Go to step  6.

    NO  - Repair open in the wire between the transmission range switch and ground (G101), or repair poor ground (G101), then go to step  15.

  6. Turn the ignition switch to ON (II).
  7. Measure the voltage between transmission range switch connector terminals No. 7 and No. 10.
    Fig 2: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 7 And No. 10
    G05455237

    Is there voltage? 

    YES  - Go to step  8.

    NO  - Repair open in the wire between the transmission range switch and PCM connector terminal C21, then go to step  15.

  8. Check for continuity between the No. 7 and No. 10 terminals at the transmission range switch.
    Fig 3: Checking Continuity Between No. 7 And No. 10 Terminals Transmission Range Switch
    G05455238

    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  - Check for poor connections and loose terminals at the transmission range switch and the PCM. If the connections are OK, go to step  9.

    NO  - Replace the transmission range switch (see TRANSMISSION RANGE SWITCH REPLACEMENT ), then go to step  15.

  9. Connect the transmission range switch connector.
  10. Update the A/T software in the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  11. Test-drive the vehicle in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then test-drive at speeds over 3 mph (5 km/h) for at least 2 seconds. Slow down, and stop the wheels.
  12. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 11.
  13. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

    Is DTC P0812 indicated? 

    YES  - If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1.

    NO  - Go to step  14.

  14. Monitor the OBD status for P0812 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 (see ECM/PCM REPLACEMENT ). If any other DTCs were indicated on step 13, go to the indicated DTCs troubleshooting.

    NO  - Check for poor connections and loose terminals at the transmission range switch and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, return to step  11 and recheck.

  15. Clear the DTC with the HDS.
  16. Test-drive the vehicle in R at speeds below 3 mph (5 km/h) for at least 2 seconds. Then test-drive at speeds over 3 mph (5 km/h) for at least 2 seconds. Slow down, and stop the wheels.
  17. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 16.
  18. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

    Is DTC P0812 indicated? 

    YES  - Check for poor connections and loose terminals at the transmission range switch and the PCM, then go to step  1.

    NO  - Go to step  19.

  19. Monitor the OBD status for P0812 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 18, go to the indicated DTCs troubleshooting.

    NO  -Check for poor connections and loose terminals at the transmission range switch and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, return to step  16 and recheck.

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