Vehicle Platform: Zest, Bolt, Tiago, Tigor, Osprey, Q501, X451, Q502 ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 3.8 Date: 17-10-2022 Author: BCM COC Page: 1104 of 1202 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. U1320 – 87 : Lost Communication With Vehicle Control Unit (VCU) – Missing Message Overview: ISO Code U1320 - 87 Customer Symptom No immediate symptom. Fault Effects (On Vehicle) NA Lamp Status (If Any) NA Fault Detection Condition CAN transceiver fault, partner ECU fault, and excessive network traffic. Normal Operating Condition Vehicle Control Unit (VCU) should function normally Probable Trouble Area CAN transceiver fault, partner ECU fault, and excessive network traffic. Healing Condition Check with Service tool, check function of partner ECU Component Details: NA Preliminary Checks: 1. Check Battery Voltage (12.5 V & above) 2. Check ECU pins for oxidation, bending & damage.
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