P0685 - Engine Control Module Power Relay Control Circuit Open

What does P0685 Mean?

The PCM (powertrain control module) receives data about the vehicle’s operating conditions from various areas in the system. In order to work properly, the PCM is supplied with power by a relay, which uses a battery voltage signal, a ground signal, and an ignition switch input signal. The voltage in the relay coil control circuit is normally low. If you see trouble code P0685, it means that the PCM’s fault detection circuit has detected voltage from the relay that measures above the normal parameters – above 4.6 volts with the key turned on.

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What are the common causes of P0685 ?

In choosing a single most common cause, I would have to say a faulty PCM relay. Other common causes may include a blown fuse, a bad fusible link, shorted or open circuits, a defective battery, faulty battery cables/cable ends, or a defective PCM.



How do you troubleshoot P0685 ?

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

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