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U0100-00 Lost Communication With ECM/Pcm

NOTE:

Perform this diagnostic procedure ONLY when the DTC status is "Active". If the DTC status is "Stored" DO NOT proceed with this diagnostic procedure. A "Stored" DTC will not affect the performance of the vehicle. 

The COMMUNICATION DIAGNOSTIC PROCEDURE MUST  be performed before replacing any component(s) or module(s). Perform the COMMUNICATION DIAGNOSTIC PROCEDURE. Refer to: COMMUNICATION DIAGNOSTIC PROCEDURE .

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