Ford P0687 OBD-II Trouble Code Definition: P0687 Engine Control Module Power Relay Control Circuit High P0687 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0687 ECM/PCM Power Relay Control Circuit High What does the code mean? OBD-ii Code P0687 definition: The Engine Control Module (ECM) has detected a high voltage condition to the ECM. Symptoms Sumptoms of […]