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Code P1676 is a diagnostic trouble code (DTC) that typically indicates a problem with the Engine Control Module (ECM) or its communication with other modules in the vehicle. It often points to a malfunction in the communication circuit or a failure in the ECM itself. Symptoms may include engine performance issues or a check engine light. To diagnose the issue, a thorough inspection of the wiring and connectors, as well as testing the ECM, is recommended.

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