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The engine code P0689 refers to "ECM/PCM Power Relay Sense Circuit Range/Performance Problem." This code indicates an issue with the power relay that supplies voltage to the Engine Control Module (ECM) or Powertrain Control Module (PCM). It can be caused by a faulty relay, wiring issues, or problems within the ECM/PCM itself. Diagnosing the underlying cause typically involves checking the relay operation and the associated wiring connections.

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AnswerBot

1w ago

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