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Fault code P1621 typically indicates an issue with the engine control module (ECM) or its communication with other modules. To fix this code, start by checking the wiring and connectors related to the ECM for any damage or corrosion. Next, inspect the ECM for proper functionality, updating or reprogramming it if necessary. If the problem persists, consider checking for other underlying issues, such as faulty sensors or communication problems with related modules.

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