NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:549 of 645 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. 157. U0140-00 CAN communication with BCM failed Overview: ISO Code U0140-00 Customer Symptom • warning light on dashboard • Creep disabled Fault Effects (On Vehicle) • warning light on dashboard • Creep disabled Lamp Status (If Any) Transmission fault lamp ON(Service indication 0x2) Fault Detection Condition CAN communication failure (either CRC or time-out or sequence counter) with the BCM node (on the receiving side, i.e. TCU = receiver) for > 1000ms Normal Operating Condition BCM ECU communicated properly with DCT TCU Probable Trouble Area 1. BCM controller. 2. TCU. 3. Wiring harness towards TCU. Healing Condition The reaction is cleared at SW restart and driving if the detection is FALSE for more than 1000 ms Component Details:- Controller Area Network or CAN protocol is a method of communication between various electronic devices like engine management systems, ESP,ABS, gear control, lighting control, air conditioning, airbags, central locking etc. embedded in an automobile. Preliminary Checks:- 1. Check the vehicle battery voltage. 2. Check if the vehicle battery voltage is less than or equal to 6.5V 3. If battery voltage is low i.e. less than or equal to 6.5V, then resolve the low battery voltage issue in the vehicle. 4. Now check the DTC status and clear the DTC. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the BCM controller and the CAN connection from the engine controller. Check other modules on CAN, if this issue is reported. Fix the problem on BCM controller. Go to step 2 2. If this issue is only reported in TCU, disconnect the vehicle side connector on TCU & connect it back again. Clear the DTC and check if the DTC does not come back. Go to step 3 3. If issue persists, check wiring harness towards TCU. If damaged, replace the vehicle side tranmission wiring harness. Clear the DTC and check if the DTC does not come back. DTC’s confirmation:-
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