Defect: Mack Trucks, Inc. (Mack) is recalling certain 2019-2020 LR vehicles. The steering transfer case may have an insufficient amount of oil.
Consequence: The internal bearings may fail without sufficient lubrication, causing steering lock-up and increasing the risk of a crash.
Remedy: Dealers will replace the transfer case, free of charge. Owner notifications letters were mailed on May 12, 2021. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0424.
Do not drive: No. Park outside: No.
Investigations
0 investigations; 0 open.
Manufacturer communications
177 manufacturer communications.
Communications by system
System
Count
ENGINE AND ENGINE COOLING
76
ELECTRICAL SYSTEM
33
POWER TRAIN
25
EQUIPMENT
24
ENGINE
15
FUEL SYSTEM, DIESEL
9
SUSPENSION
7
EQUIPMENT ADAPTIVE/MOBILITY
6
11032086
Date: 2026-04-09. Type: Service Bulletin/Repair Instructions. Systems: POWER TRAIN.
CBR - Mack Carrier Nut Adhesive Change.
11032092
Date: 2026-04-09. Type: Service Bulletin/Repair Instructions. Systems: POWER TRAIN.
CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
11028032
Date: 2026-01-07. Type: Service Bulletin/Repair Instructions. Systems: ENGINE.
CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT APPLY TO AN(4) and PR(4)).
11026025
Date: 2025-11-22. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, ENGINE.
CBR - Mack Temperature Sensor Troubleshooting Guide
11024783
Date: 2025-10-20. Type: Service Bulletin/Repair Instructions. Systems: STEERING.
CBR - Hard Steering Due to Steering Column Miter Box Corrosion a Inspection and Replacement Procedure
11021332
Date: 2025-07-28. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
CBR - A significant GPS reporting issue is affecting fleet operations, with trucks maintaining back-office communication but failing to transmit GPS location data.
11021333
Date: 2025-07-17. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM, SERVICE BRAKES.
CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
11018804
Date: 2025-05-28. Type: Service Bulletin/Repair Instructions. Systems: ENGINE.
Inactive Code P25AE00 Being Generated After A Hard Pull And A Momentary Drop In Engine Oil Pressure (Low Oil Pressure) (Possible Related Codes - SPN4811 , SPN 100 , PID 100)
11018813
Date: 2025-05-27. Type: Service Bulletin/Repair Instructions. Systems: ENGINE, FUEL/PROPULSION SYSTEM.
Date: 2025-05-13. Type: Service Bulletin/Repair Instructions. Systems: ELECTRICAL SYSTEM.
Remote Control Central Door Lock, Programming; Key Fob Cannot Be Programmed Or Does Not Work After Programming - Model Year 2018 And Newer
Notes on this record
Complaints from the API and bulk file are merged and deduplicated by ODI number; the API alone misses records.
System and subsystem counts are numbers of distinct complaints, recalls or communications that name them. One record can name several systems, so shares across systems can add to more than 100 percent; a single share never exceeds 100 percent.
Recalls are counted once per campaign, investigations once per action and manufacturer communications once per NHTSA id, even when NHTSA lists several model names for the same record.
A sales denominator is a calendar-year proxy, not the population of vehicles still in use. Rates are copied from verified pipeline output.
NHTSA's complaints API and bulk file list no complaint for this make, model and model year in this data build.