Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 628 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent U0121-31: Lost communication with Antilock Braking System Module- ABS/ESP Bus signal/ Message Failure Overview: DTC Code U0121-31 DTC Description as per ISO Standards Lost Communication with Antilock Braking System Module Customer Symptom ESP/ABS will not work, Drag torque control or torque limit function will not happened Fault Effects (On Vehicle) ESP/ABS will not work, Drag torque control or torque limit function will not happened Lamp Status (If Any) ESP/ABS lamp will be ON Fault Detection Condition 1. ABS connector isnot connected properly or disconnected from its location. 2. ABS/ ESP is not powered up 3. ABS/ ESP connector is not connected/ disconnected from vehicle side wiring harness. 4. CAN_H, CAN_L or/ and both lines of ABS/ ESP are opened Normal Operating Condition ECM ECU communicates properly with ABS ECU. Probable Trouble Area 1. Disconnection of the ABS connector 2. CAN_H and CAN_L lines at ABS connector end Healing Condition 1. To fix the ABS connector correctly and Fix the wiring harness issues from ABS side. 2. CAN_H, CAN_L or/ and both lines of ABS are connected properly to the ABS connector.
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