Gravitas/SAFARI/X451/NEXON FATC DTC Troubleshooting Data Version: 1.1 Date: 28-Apr-2021 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: 196 of 244 U0028-13:- Vehicle Communication Bus A-open circuit Overview: ISO Code U0028-13 Customer Symptom Reduced climate control functionality and performance. Fault Effects (On Vehicle) Reduced climate control functionality and performance. Lamp Status (If Any) N.A Fault Detection Condition 1. HVAC connector is not connected properly or disconnected from its location 2. CAN Stub wire from HVAC connector side is disconnected. Normal Operating Condition HVAC ECU communicates properly with TML diagnostic Tool. Probable Trouble Area Disconnection of the HVAC connector Healing Condition To fix the HVAC connector correctly and Fix the wiring harness issues from HVAC side.
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