Dean H Posted February 26 Report Share Posted February 26 U0121-00- LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE ا Set Conditions: The Body Control Module (BCM) does not receive any CAN Bus messages from the Anti-lock Brake System (ABS). Causes- ANTI-LOCK BRAKE SYSTEM MODULE (ABS) POWERS AND GROUNDS ANTI-LOCK BRAKE SYSTEM MODULE (ABS) CAN C BUS (+) CIRCUIT OPEN CAN C BUS (-) CIRCUIT OPEN Quote Link to comment Share on other sites More sharing options...
Dean H Posted February 26 Author Report Share Posted February 26 (edited) #1) Battery- tested healthy. #2) Battery cables and ground connections cleaned. #3) Check fuses for ABS in the Underhood fuse box. TIPM. Inside the lid shows the fuse diagram. F141 40 amp F173 25 amp F156 10 amp #4) ABS module grounds. There are 2 ground wires. Passenger strut tower 2 ground studs. Clean and check for broken wires. Edited February 26 by Dean H Quote Link to comment Share on other sites More sharing options...
Dean H Posted February 26 Author Report Share Posted February 26 (edited) After the previous steps have been done. Using a bi-directional scanner. Check if it can communicate with the abs module. Using a Dodge wiring diagram. Next, would be to check the ABS module connector for damage and any broken wires. The CAN BUS communication lines are 2 small wires twisted together. The ABS MODULE itself could be shorted out internally. The ABS module is hidden up underneath the passenger side cowl in the engine bay. Edited February 26 by Dean H Quote Link to comment Share on other sites More sharing options...
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