P1698 on a GM vehicle means the Body Control Module (BCM) or another module on the Class 2 serial data bus has not received any messages from the Powertrain Control Module (PCM) over the Chrysler Collision Detection (CCD) bus for a set period. The computer detected a complete loss of communication from the PCM, not a single missed message, which points to a wiring, power, or PCM fault rather than a sensor problem.
Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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