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Home >> Dodge and Ram >> 2011 >> Caliber Express >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Final Drive Control Module (FDCM) - Electrical Diagnostics) >> DTC Troubleshooting >> U0100-Lost Communication With ECM/Pcm >> Possible Causes
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Possible Causes

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
CAN C+ OR CAN C- BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
TIPM NOT CONFIGURED CORRECTLY
ECM/PCM POWER AND GROUND
ECM/PCM
IPM
MODULE THAT SET THIS DTC