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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 338 (Cruise Control System - Active Cruise Control Module (Acc) - Electrical Diagnostics) >> DTC Troubleshooting >> U0121-Lost Communication With Anti-Lock Brake Module >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
CAN C BUS CIRCUITS OPEN OR SHORTED
DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES PRESENT
ABS MODULE POWER AND GROUND
ABS MODULE
ACC MODULE