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ECM/PCM Power Relay Sense Circuit /Open

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16y ago

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How do you test a p0688 obd code?

To test a P0688 OBD code, start by checking the vehicle’s battery and ensuring it has a proper charge, as low voltage can trigger this code. Next, inspect the engine control module (ECM) and its connectors for any signs of damage or corrosion. Use a multimeter to test the power and ground circuits to the ECM, ensuring they are functioning correctly. If these checks don't reveal issues, consider testing the ECM itself, as it may be malfunctioning.


How do you fix engine code p0688?

Engine code P0688 indicates a problem with the engine control module (ECM) power relay circuit. To fix it, first, check the ECM power relay and its associated fuses for damage or failure. Inspect wiring and connectors for corrosion or shorts, and repair or replace any faulty components. If everything appears intact, consider testing or replacing the ECM itself, as it may be malfunctioning.


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