DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If the problem doesn't return after you clear the DTC, or if this DTC is stored intermittently, check for poor connections or loose terminals at the IGP line connectors before replacing the PCM.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Start the engine, and let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Start the engine, and let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0685 indicated?
YES -Go to step 9.
NO -Intermittent failure, the system is OK at this time.
- Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Start the engine, and let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Start the engine, and let it idle for 30 seconds.
- Turn the ignition switch to LOCK (0).
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0685 indicated?
YES -If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 10. If the PCM was substituted, go to step 1.
NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the INDICATED DTC'S TROUBLESHOOTING .