Vehicle Platform: Nexon-EV ,Nexon-MCE ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.4 Date: 16-09-2020 Author: TCM COC Page: 52 of 121 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. U0100 - 08:- Lost Communication with ECM/PCM "A" - Bus Signal / Message Failures Overview: ISO Code U0100 – 08 Lost Communication With ECM/PCM "A" - Bus Signal / Message Failures Customer Symptom Following Telematics features will not be working:- Alerts about critical car parameters (Including battery related alerts), Valet Mode , View Car Health Dashboard Fault Effects (On Vehicle) N/A Fault Detection Condition Relevant functional DTCs present in TCU .DTC is set in case of Lost Communication With ECM/PCM "A" Normal Operating Condition ECM/PCM "A" ECU communicates properly with TCU in normal condition. Probable Trouble Area CAN_H and CAN_L wires CAN transceiver faulty Faulty ECM/PCM "A" ECU The TCU has detected a communication problem on the CAN regarding the ECM/PCM "A" Module CAN high / CAN low pins shorted to Battery/Open/ shorted to Ground CAN transceiver faulty DTC is to be logged when the subscribed message is not available on the CAN bus from ECM/PCM "A" module Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify ECM/PCM "A" DTCs and check for any related DTCs 3. Follow ECM/PCM "A" trouble shooting guideline 4. Check CAN H and CAN L connections for short/open 5. Check for CAN transceiver faulty ,if it is fault then replace 6. Power down the device, power up again and wait for at least one minute. If the problem reoccurs, check whether any other CAN-related DTCs are set in the TCU. In that case, check for problems with the CAN hardware (TCU and bus) 7. Clear the DTC 8. If problem persists after above steps (from 1 to 7) then follow ECM/PCM "A" ECU DTC trouble shooting guide.
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