Vehicle Platform: All ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.12 Date: 02-06-2022 Author: TCM COC Page: 24 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. U0424 - 81:- Invalid Data Received From HVAC Control Module - invalid serial data received Overview: ISO Code U0424 – 81 Invalid Data Received From HVAC Control Module - invalid serial data received Customer Symptom Following Telematics features will not be working:- Remote climate/HVAC control, Alerts about critical car parameters (Including battery related alerts), View Trip details and Provide drive pattern analytics with Driver Score (Should be sharable on social media) Fault Effects (On Vehicle) Remote climate feature and other telematics features will not be working Fault Detection Condition Relevant functional DTCs present in TCU. TCU receives incorrect serial data from HVAC Normal Operating Condition HVAC ECU sends correct serial data in normal condition. Probable Trouble Area CAN_H and CAN_L wires Faulty HVAC Incorrect serial data received from HVAC The TCU has detected a communication problem on the CAN regarding the HVAC. 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 HVAC DTCs and check for any related DTCs 3. Follow HVAC 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 HVAC DTC trouble shooting guide
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