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Dodge and Ram
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2009
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Journey SXT, AWD
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Repair and Diagnosis
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Transmission
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Automatic Trans
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(Transmission Control Module (TCM) - Electrical Diagnostics)
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DTC Troubleshooting
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U0121-Lost Communication With Anti-Lock Brake Module
›
Possible Causes
Possible Causes
Possible Causes
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
TIPM NOT CONFIGURED CORRECTLY
ABS
ABS POWER AND GROUND
MODULE THAT SET THIS DTC