Q5/X451 FATC DTC Troubleshooting Data Version: 1.0 Date: 16-Oct-2018 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. Author: ERC Page: 190 of 202 U0140-08:- Lost communication with Body Control Module- Message Timeout Failure Overview: ISO Code U0140-08 Customer Symptom Reduced climate control functionality and performance Fault Effects (On Vehicle) Reduced climate control functionality and performance Lamp Status (If Any) 1) The lost communication with BCM DTC is in active state in fault memory. 2) The HVAC outputs (motors and compressor request signal) should be functional using default data values 3) CAN communication should be normal but BCM node message should disappear. 4) The lost communication with BCM DTC is in passive state in fault memory. 5) The HVAC outputs (motors and compressor request signal) should be respond to the panel request. 6) CAN communication should be normal. Fault Detection Condition 1. BCM connector is not connected properly or disconnected from its location. 2. CAN Stub wire from IPC connector side is disconnected. 3. BCM ECU is not powered up. Normal Operating Condition BCM ECU communicates properly with TML diagnostic Tool. Probable Trouble Area Disconnection of the BCM connector Healing Condition To fix the BCM connector correctly and Fix the wiring harness issues from IPC side.
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