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Code P1663 on a Toyota Sienna refers to a problem with the engine control module (ECM) related to the communication between the ECM and the vehicle's body control module (BCM). This code often indicates issues with wiring, connectors, or the modules themselves. It may lead to various electrical problems, including issues with the vehicle’s lights or other electronic systems. Diagnosing the root cause typically involves checking the related components and wiring for faults.

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