TML Gen3 IVI DTC Troubleshooting guide Version: 0.4 Draft Date: 04-Aug-23 Author: Hemant Mitra Page: 467 of 584 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. U0028 - 13:- Vehicle Communication Bus A-open circuit Overview:- ISO Code U0028-13 Customer Symptom EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON,SRS Lamp ON, EBD Lamp ON Fault Effects (On Vehicle) No vehicle speed, engine speed, temperature gauge and fuel computer will not be available. Lamp Status (If Any) EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON,SRS Lamp ON,EBD Lamp ON Fault Detection Condition Open circuit of the both CAN_H (connector pin no.22) and CAN_L(connector pin no.23), only CANH, only CANL Normal Operating Condition ECU communicates properly with all ECUs. Probable Trouble Area CAN_H and CAN_L wires Healing Condition Reconnection of the CAN_H ( connector pin No.22) and CAN_L(connector pin no.23)with the main CAN bus U0028 - 88:- Vehicle Communication Bus A-Bus off Overview:- ISO Code U0028-88 Customer Symptom EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON, SRS Lamp ON,EBD Lamp ON Fault Effects (On Vehicle) No vehicle speed, engine speed, temperature gauge and fuel computer will not be available. Lamp Status (If Any) EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON,TCM Lamp ON,SRS Lamp ON,EBD Lamp ON Fault Detection Condition Short circuit between CAN_H -CAN_L, CAN_H -GND, CAN_LBattery lines. This DTC may also get logged in case of CANH OR CAN L open circuit. Normal Operating Condition ECU communicates properly with all ECUs. Probable Trouble Area CAN_H and CAN_L wires Healing Condition Removal of the above mentioned shorts/open in the wiring harness or at ECU pin.
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