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Home › Jeep › 2011 › Compass Base, 2.4 B, FWD, Standard › Repair and Diagnosis › External Pages › Different variant/trim › Section 8 ((Transmission Control Module (TCM) - Electrical Diagnostics)) › DTC Troubleshooting › U0121-Lost Communication With Antilock Brake Module › Set Condition:

Set Condition:

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A loss of CAN Bus communication between the TCM and ABS for the period of 2.0 seconds.