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Pinpoint Test Bu : U0140:00 Or U0140:81: Notes

Normal Operation and Fault Conditions 

IPC DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets in continuous memory in the IPC if data messages received from the BCM through the GWM are missing for 5 seconds or longer.
U0140:81 Lost Communication With Body Control Module: Invalid Serial Data Received Sets in continuous memory in the IPC if data messages received from the BCM through the GWM are invalid for 5 seconds or longer.

Possible Sources 

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