P0686

ECM/PCM Power Relay Control Circuit Low

DTC P0686, sometimes indicated as P068600 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the transmission (gearbox) causing ecm/pcm power relay control circuit low.

One possible cause of this DTC is a bad power relay. If the power relay is bad, it will not be able to provide power to the ECM/PCM, which will cause the DTC to set.

  • P0686: ECM/PCM Power Relay Control Circuit Low
  • P0686: Engine control (EC) relay – circuit low
  • P0686 00: Engine control (EC) relay - circuit low

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