DTC Troubleshooting: U0100 (Body Control Module): Notes

DTC U0100  : BCM lost communication with ECM/PCM

How to use this information .

NOTICE: 

Before you troubleshoot, review the How to Troubleshoot .

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
• DTC may be stored if PCM does not start normally.
• DTC may be stored due to the power/ground circuit failure of the PCM. Before this troubleshooting, check the power/ground circuit of the PCM first.