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.

    TIPM is configured correctly.

  • Set Condition:

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


Possible Causes
  
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
  
DTC'S RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
  
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.


NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.




Is this DTC active?

Yes
  • Go To 2


No

2.CHECK FOR ANY OF THE FOLLOWING ACTIVE DTC'S


NOTE: Check for TIPM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTC's.



Does the scan tool display any active DTC's to the conditions listed above?

Yes


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

4.CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC'S



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

Yes


No