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Pinpoint Test B : DTC (Diagnostic Trouble Code) U0100:87: Notes

Normal Operation and Fault Conditions 

When the ignition is transitioned out of off, the BCM receives the PCM ID. If the BCM does not receive the PCM ID or the ID is invalid, the PATS does not allow the engine to start.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0100:87 Lost Communication With ECM/PCM "A": Missing Message Sets when the BCM does not receive the ID from the PCM over the HS-CAN. The ID is only sent one time per ignition cycle and is sent within milliseconds of the ignition being transitioned out of off.

Possible Sources 

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