22524 Hex Flange Lock Nut May Break – 2021-2022 International CV, 2022-2023 International HV, 2023 IC 1300 FBC, CE, RE, TC, International MV, HX, LT, RH, & LoneStar

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OMB Control No.: 2127-0004 Part 573 Safety Recall Report 22V-869 The information contained in this report was submitted pursuant to 49 CFR §573 Manufacturer Name : Navistar, Inc. Submission Date : NOV 23, 2022 NHTSA Recall No. : 22V-869 Manufacturer Recall No. : 22524 Manufacturer Information : Manufacturer Name : Navistar, Inc. Address : 2701 Navistar Drive Lisle IL 60532 Company phone : 331-332-1590 Population : Number of potentially involved : 25,822 Estimated percentage with defect : 100 % Vehicle Information : Vehicle 1 : 2023-2023 IC 1300 FBC Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 103 1300 FBC commercial buses in the suspect population Production Dates : MAR 04, 2022 – MAR 28, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 2 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 2 : 2023-2023 IC CE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 22 CE commercial buses in the suspect population Production Dates : MAR 04, 2022 – MAR 28, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 3 : 2021-2022 International CV Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 1,936 CV series trucks in the suspect population Production Dates : JAN 18, 2022 – AUG 12, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 3 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 4 : 2023-2023 International MV Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 52 electric MV series trucks in the suspect population Production Dates : MAR 24, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 5 : 2022-2023 International HV Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 1,419 HV series trucks in the suspect population Production Dates : JAN 18, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 4 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 6 : 2023-2023 International HX Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 479 HX series trucks in the suspect population Production Dates : FEB 13, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 7 : 2023-2023 International LoneStar Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 118 LoneStar series trucks in the suspect population Production Dates : FEB 13, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 5 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 8 : 2023-2023 International LT Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 10,966 LT series trucks in the suspect population Production Dates : FEB 13, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 9 : 2023-2023 International MV Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 9,135 MV Diesel series trucks in the suspect population Production Dates : JAN 18, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 6 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 10 : 2023-2023 International MV Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : CNG/LPG Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 95 MV LPG series trucks in the suspect population Production Dates : FEB 14, 2022 – AUG 12, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 11 : 2023-2023 IC RE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 26 RE commercial buses in the suspect population Production Dates : MAY 12, 2022 – AUG 10, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Part 573 Safety Recall Report 22V-869 Page 7 The information contained in this report was submitted pursuant to 49 CFR §573 Vehicle 12 : 2023-2023 International RH Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 1,361 RH series trucks in the suspect population Production Dates : FEB 13, 2022 – AUG 16, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Vehicle 13 : 2023-2023 IC TC Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : DIESEL Descriptive Information : • The suspect population is identified by models built with non-conforming hex flange lock nuts that did not fail at time of vehicle assembly. • The inclusive dates of manufacture were determined by when Navistar began use of non-conforming hex flange lock nuts and when the issue was corrected in production. • The vehicles in the suspect population were built with non-conforming hex flange lock nuts and all other similar vehicles not in the suspect population were built with conforming hex flange lock nuts. There are 110 TC commercial buses in the suspect population Production Dates : JAN 18, 2022 – JUN 10, 2022 VIN Range 1 : Begin : NR End : NR Not sequential Description of Defect : Description of the Defect : • A specific hex flange lock nut (P/N 416743C2) was not properly formed and heat treated to Navistar specification. This lock nut is used in several joint locations on a chassis: o pitman arm pinch bolt joints o steering gear mounting joints o front axle U-bolt joints o front and rear spring eyes o certain rear spring tie • All vehicles contain at least one suspect bolted joint, but due to vehicle configuration, not all vehicles will require all joints to be repaired. Part 573 Safety Recall Report 22V-869 Page 8 The information contained in this report was submitted pursuant to 49 CFR §573 FMVSS 1 : NR FMVSS 2 : NR Description of the Safety Risk : Improperly manufactured nuts that did not immediately fail during vehicle assembly can result in a loss of joint tension as the vehicle ages. This nut is used mainly in suspension (front/rear) and steering gear joints. Loss of tension in these joints may affect vehicle handling which could contribute to a vehicle crash. Description of the Cause : A tier 3 supplier was found to not have adequate heat treat furnace controls to ensure consistent nut surface hardness. In addition, this supplier’s tooling was found to be worn, contributing to mis-formed threads. Identification of Any Warning that can Occur : A general ‘loose’ feeling when driving. Involved Components : Component Name 1 : 3/4″ – 16 hex flange lock nut Component Description : Hex flange lock nut Component Part Number : International P/N 416743C2 Supplier Identification : Component Manufacturer Name : Facil NA Address : 2242 Pinnacle Pkwy #100 Twinsburg Ohio 44087 Country : United States Chronology : • 08/16/2022 – Navistar Supplier Quality communicates the concerns of certain hex flange lock nuts stripping at time of vehicle assembly. • 08/26/2022 – Navistar quarantines all vehicles at all assembly plants. • 09/14/2022 – Navistar Supplier Quality and Compliance meet with Engineering to discuss the issue and Engineering initiates investigation to determine full use of certain hex flange lock nuts. • 09/22/2022 through 11/02/2022 – Navistar performs multiple tests to certain hex flange lock nuts returned to Navistar. • 11/04/2022 – Navistar initiates risk assessment on over 300 features. • 11/16/2022 – Navistar completes its risk assessment and determines the impact to all International Part 573 Safety Recall Report 22V-869 Page 9 The information contained in this report was submitted pursuant to 49 CFR §573 and IC Bus vehicles • 11/17/2022 – Navistar finalizes the suspect population. • 11/18/2022 – Navistar declares a Safety Recall. As of this time no warranty claims or field failures have occurred in the suspect population. Description of Remedy : Description of Remedy Program : • The remedy will involve replacing all suspect hex flange lock nuts with hex flange lock nuts made to their design specifications. • Navistar’s plan for reimbursement of pre-notification remedies, on file with NHTSA and dated 05/06/2022, applies and reimbursement instructions will be included in the customer notification. How Remedy Component Differs from Recalled Component : The remedy hex flange lock nuts are made to the specified form and surface hardness where the recalled hex flange lock nuts were not. Identify How/When Recall Condition was Corrected in Production : 08/26/2022 – Navistar quarantines all vehicles at all plants and begins use of hex flange lock nuts manufactured to their specified design values. Recall Schedule : Description of Recall Schedule : It is estimated that the Customer and Dealer notification letters will be mailed by 01/20/2023. Planned Dealer Notification Date : JAN 20, 2023 – JAN 20, 2023 Planned Owner Notification Date : JAN 20, 2023 – JAN 20, 2023 * NR – Not Reported

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