Vehicle Platform: All ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.12 Date: 02-06-2022 Author: TCM COC Page: 40 of 150 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. U0402 - 81 :- Invalid Data Received From TCM (Transmission Control Module) - invalid serial data received Overview: ISO Code U0402 – 81 Invalid Data Received From TCM - invalid serial data received Customer Symptom Following Telematics features will not be working :- Alerts about critical car parameters (Including battery related alerts), View Car Health Dashboard Fault Effects (On Vehicle) N/A Fault Detection Condition Relevant functional DTCs present in TCU. TCU receives incorrect serial data from TCM Normal Operating Condition TCM ECU sends correct serial data in normal condition. Probable Trouble Area CAN_H and CAN_L wires Internal TCM hardware errors Faulty TCM The TCU has detected a communication problem on the CAN regarding the TCM. 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 TCM DTCs and check for any related DTCs 3. Follow TCM 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 TCM DTC trouble shooting guide.
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