DTC Troubleshooting Master Document for BMS Version: 1.0 Date: 30th Nov 2022 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. P1238 - 16:- BMS_PrechargeFaultAlarm third level alarm - circuit voltage below threshold Overview: ISO Code P1238 - 16 Customer Symptom Vehicle cannot be cranked Fault Effects (On Vehicle) Battery will be non functional Lamp Status (If Any) HV Fault on cluster Fault occurrence scenario(In the order of probability) Battery will be disconnected Normal Operating Condition _ Probable Trouble Area Precharging circuit internal to battery Healing Condition NA Component Details: Precharge relay closes the contactor based on HVIL detect and when the circuitry of the pack is complete and ready to discharge or charge. Preliminary Checks: 1) Ensure the vehicle is parked and not in charging 2) Ensure that the vehicle is in ignition ON condition Inspection Method: Connect the tool and communicate to the battery pack as instructed through APPENDIX-C Read DTC information of DTC ID – P1238-16 Rectification Action: 1) If DTC is appearing in real time, clear DTC information through service tool 2) If DTC is not appearing in real-time but has only occurred before, store the snapshot data. 3) Clear the DTC information on the respective DTC ID. DTC’s confirmation: After clearing, ensure the following points by referring to BMS DTC list. 1) Read DTC ID – P1238-16for the existence of DTC information. 2) If DTC still exists, reflash the battery pack using the service tool with the latest release SW available in PLM database. 3) Read DTC ID – P1238-16for the existence of DTC information post flashing. 4) If DTC still exists, the HV battery pack component has to be replaced as instructed by the respective ECU replacement guide Component Location & Image; Connector Location; Connector View & Information: - APPENDIX-A
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