FixVault
Home
›
Jeep
›
2012
›
Compass Limited, AWD, Standard
›
Repair and Diagnosis
›
Transmission
›
Automatic Trans
›
Transmission Control Module (TCM) - Electrical Diagnostics
›
DTC Troubleshooting
›
U0121-Lost Communication With Antilock Brake Module
›
Set Condition:
Set Condition:
A loss of CAN Bus communication between the TCM and ABS for the period of 2.0 seconds.