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Home >> Jeep >> 2010 >> Commander Sport, 3.7 K, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Transmission Control Module (TCM) - Electrical Diagnostics - Nag1 Automatic Transmission >> DTC Troubleshooting >> U0121-Lost Communication With Anti-Lock Brake Module >> Possible Causes

Possible Causes

Possible Causes 
TRANSMISSION CONTROL MODULE (TCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure  . 

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