Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 508 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent P1405- 00: EGRH Battery Voltage Very Low Overview: Code Cause Effect on Vehicle Fault Code: P1405-00 1. Low voltage supply to EGR module 2. Alternator cut off circuit failure 3. ECU hardware malfunction 1.CE Lamp ON 2.Higher engine noise may be observed Lamp status: Check Engine Lamp on Malfunction Indicator Lamp off Checkpoints: 1. Check the Battery voltage at Ignition off (Nominal range - 11.5 V to 12.8V) 2. Check for any battery related faults. If present, address it first. Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check, EGR connector is connected properly - Step 2 Check whether the battery terminals are connected properly and they are tight. If not proper, do the necessary repair - Step 3 Check ECU connection: 1] Key off 2] Remove the ECU 3] Connect ECU connector Properly 4] Key on and Read the faults - Step 4 Check the charging circuit. In case of any problems in charging, do the necessary repair - Step 5 Check whether the battery voltage read by the multimeter is matching the battery voltage displayed in the service tool by ECU - Step 6 If there is a mismatch, replace the ECU -
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