Vehicle Platform: All ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.12 Date: 02-06-2022 Author: TCM COC Page: 38 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. U0037 - 88 :- Vehicle Communication Bus B - bus off Overview: ISO Code U0037 – 88 Vehicle Communication Bus B – Bus Off Customer Symptom All features related to telematics ECU will not be working Fault Effects (On Vehicle) Remote , Vehicle security, Alerts and other telematics features will not be working Fault Detection Condition Short circuit between CAN_H -CAN_L, CAN_H -GND, CAN_L-Vbatt lines. This DTC may also get logged in case of CANH or CAN L open circuit. Normal Operating Condition TCU communicates Properly with diagnostic tool and there is no signal/ message failure to the Partner ECU’s Probable Trouble Area Faulty TCU Internal Component failure CAN transceiver faulty CAN H and CAN L pins(pin:6 and 7) are shorted /open/ground TCU pin have problem with oxidation, bending & damage Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify any other communication related DTCs present 3. Verify TCU DTCs and check for any related DTCs 4. Follow TCU trouble shooting guideline to clear the relevant functional DTCs 5. Check for internal component failure 6. Check CAN errors on vehicle CAN communication 7. If problem persists after above steps( from 1 to 6) then replace TCU
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