`142 Author: Navya Krishnan/Satyajit 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. Kanger 2.0 DTC Troubleshooting Data Version: 1.0 Date: 15-Feb-2022 P19B996:- DCDC internal fault Overview: ISO Code (If applicable) P19B996 Customer Symptom NA Fault Effect (On Vehicle) DCDC Converter is not charging LV battery. Vehicle stops when LV battery is completely drained Lamp Status (If Any) NA DTC Detection Condition This DTC gets logged if LV_HW_OVER_VOLTAGE SEC_SUPPLY_FAIL_12V SEC_SUPPLY_FAIL_5V SAFETY MOS ERR One of DCDC internal fault happens Normal Operating Condition None of DCDC internal fault happens Probable Trouble Area 1.DCDC Internal self- test Failure 2. DCDC Functional Safety Failure 3.DCDC Hardware is damage Healing Condition Ignition OFF wait till VCU sleeps & Ignition ON Write up for the related system:- The component 3in1( DC-DC Converter, On-Board Charger and Power distribution unit)is used to charge LV battery, HV battery and act as junction box between HV power train components ( PTC, e-Compressor, HV battery, Fast Charging and MCU)
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