DTC codes / Chrysler codes / P1681
P1681 on a Chrysler vehicle means the instrument panel cluster (IPC) has not sent any messages over the Chrysler Collision Detection (CCD) bus for a set period, so the powertrain control module (PCM) logs a communication loss. The PCM expects regular status updates from the cluster, and when those J1850-format messages stop arriving, it sets this code and may illuminate the check engine light.
Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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