DTC U0100: Lost Communication With ECM/Pcm: Notes

For a complete wiring diagram Refer to SYSTEM WIRING DIAGRAMS .

• 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 2 to 5 seconds  .

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 POWER AND GROUND

ECM/PCM

MODULE THAT SET THIS DTC