U0100-LOST COMMUNICATION WITH ECM/PCM

For a complete wiring diagram Refer to Section 8W.


  • When Monitored:
    • With the ignition on
    • Battery voltage between 10 and 16 volts
    • IOD fuse installed
    • FCM is configured correctly
  • Set Condition:

    Bus messages not received from the ECM/PCM for approximately 500 ms.


Possible Causes
  
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
  
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
  
FCM NOT CONFIGURED CORRECTLY
  
ECM/PCM
  
ECM/PCM POWER AND GROUND
  
MODULE THAT SET THIS DTC
  



Diagnostic Test

1.VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.




Is this DTC active?

Yes
  • Go To 2


No
  • Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
  • Perform BODY VERIFICATION TEST – VER 1.

2.CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS


NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.



Does the scan tool display any active DTCs to the conditions listed above?

Yes
  • Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.
  • Perform BODY VERIFICATION TEST – VER 1.


No
  • Go To 3

3.VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS





Is the ECM/PCM active on the bus?

Yes
  • Go To 4


No
  • Refer to the Table of Contents located in this section for a no response test procedure.
  • Perform BODY VERIFICATION TEST – VER 1.

4.CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS



Is there more than one module with active DTCs “Logged Against” the ECM/PCM?

Yes
  • Replace/update the ECM/PCM in accordance with the service information.
  • Perform BODY VERIFICATION TEST – VER 1.


No
  • Replace/update the module that set this DTC in accordance with the service information.
  • Perform BODY VERIFICATION TEST – VER 1.