DTC Troubleshooting: P0685 (135)

DTC P0685: ECM/PCM Power Control Circuit Malfunction

1. Turn the ignition switch ON (II).

1. Clear the DTC with the HDS.

1. Start the engine, let it idle 30 seconds.

1. Turn the ignition switch OFF.

1. Start the engine, let it idle 30 seconds.

1. Turn the ignition switch OFF.

1. Turn the ignition switch ON (II).

1. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0685 indicated?

YES | - | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM / PCM .■
NO | - | Intermittent failure, system is OK at this time.■