Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 654 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 U0037-86: Vehicle Communication Bus A- Error Passive Overview: DTC Code U0037-86 DTC Description as Per ISO Standards Vehicle communication Bus A – Error Passive Customer Symptom Check engine lamp will be ON Fault Effects (On Vehicle) Vehicle may not start Lamp Status (If Any) Check engine lamp will be ON , Fault Detection Condition 1. Open circuit of CAN_H/ CAN_L/ both lines of ECM ECU 2. Short circuit between CAN_H - Vbatt, CAN_L –GND of ECM ECU Normal Operating Condition ECM ECU communicates properly with other partner ECUs in the CAN network Probable Trouble Area CAN_H () and CAN_L () wires Healing Condition 1. Removal of the above mentioned shorts in the wiring harness or at ECU pin. 2. Reconnecting CAN_H/ CAN_L/ both lines
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