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: 24 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. U1622 - 81:- Invalid Data Received From Vehicle Control Unit - invalid serial data received Overview: ISO Code U1622 – 81 Invalid Data Received From Vehicle Control Unit - invalid serial data received Customer Symptom Following Telematics features will not be working:- Remote climate/HVAC control, Remote immobilization when car is stolen , Remote charging On/Off, Valet Mode , EV range prediction - VCU Calculated, View Car Health Dashboard, Time to charge ( in Hrs and Mins), Remote SOC, EV motor check, one battery and DTE check Fault Effects (On Vehicle) Remote , Vehicle security, Alerts and other telematics features will not be working Fault Detection Condition Relevant functional DTCs present in TCU. TCU receives incorrect serial data from VCU Normal Operating Condition VCU ECU sends correct serial data in normal condition. Probable Trouble Area CAN_H and CAN_L wires Internal VCU hardware errors Faulty VCU The TCU has detected a communication problem on the CAN regarding the VCU. CAN high / CAN low pins shorted to Battery/Open/ shorted to Ground CAN transceiver faulty Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify VCU DTCs and check for any related DTCs 3. Follow VCU 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 VCU DTC trouble shooting guide
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