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Pinpoint Test BQ : U0256:00, U0557:80, U0557:81 Or U0557:82: Notes

U0256:00, U0557:80, U0557:81 Or U0557:82 

Normal Operation and Fault Conditions 

IPC DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0256:00 Lost Communication With Front Controls Interface Module "A": No Sub Type Information Sets in continuous memory in the IPC if data messages received from the FCIM through the GWM are missing for 5 seconds or longer.
U0557:80 Invalid Data Received From Front Controls Interface Module "A": ISO/SAE Reserved Sets in continuous memory in the IPC if invalid data messages received from the FCIM are missing for 5 seconds or longer.
U0557:81 Invalid Data Received From Front Controls Interface Module "A": Invalid Serial Data Received Sets in continuous memory in the IPC if invalid serial data messages received from the FCIM are missing for 5 seconds or longer.
U0557:82 Invalid Data Received From Front Controls Interface Module "A": Alive/Sequence Counter Incorrect/Not Updated Sets in continuous memory in the IPC if updated data messages received from the FCIM are missing for 5 seconds or longer.

Possible Sources 

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