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How do I fix trouble code P0685 on my Honda Pilot

  

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I have an 09 pilot w/ 166k miles. I have a code that kicked on last week, P0685 ECM/PCM Power Relay control circuit open. Most videos I watched says to replace the relay labeled PGM-Fi in the fuse box. But how can I diagnose to see if it’s really the relay?? Thanks.


1 Answer
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See below for all possible causes and how to go about it:

https://www.obd-codes.com/p0685


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