For Shop Owners

P0685 HONDA - Engine Control Module Power Relay Control Circuit Open

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Engine Control Module (ECM) power relay
  • ECM power relay harness is open or shorted
  • ECM power relay circuit poor electrical connection
  • Blown ECM fuse
  • Faulty ECM
What does this mean?

Tech notes

Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the ECM relay should take care of the problem.
What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0685 HONDA Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.
OBDII Code P0685 Honda - Engine Control Module Power Relay Control Circuit Open -

P0685 HONDA Information for specific Honda models

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P0685 HONDA Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0685 Honda code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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