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Service bulletins for the 2026 Mack Granite

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

33 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
TSB M-371-005A 2026092026-10-02. Service bulletin. ELECTRICAL SYSTEM. Jumper Harness Repair for Version 4 Mack Trucks
TSB M-913-001 2026092026-10-02. Service bulletin. ENGINE; POWER TRAIN. Parker engine-mounted hydraulic pump service bulletin.
TSB M-373-003 2026092026-10-02. Service bulletin. ELECTRICAL SYSTEM. Power Cable Alternator Replacement
CBR 2483-6 2026092026-10-01. Service bulletin. ELECTRICAL SYSTEM. Diagnostic instructions for CAN network communication issues.
CBR 159 2026082026-09-01. Service bulletin. ELECTRICAL SYSTEM. Mack Trucks Equipped With A Cummins Engine - Engine Preheat Icon Does Not Illuminate In The Instrument Cluster (IC) During Engine Pre-heat (Intake Air Heater) Operation - Vehicles With 2018Instrument Cluster Update, Model Year2018 And Newer
CBR 2595 0720262026-08-03. Service bulletin. WHEELS; SEATS. CBR - The purpose of this CBR is to provide information on 2010 and newer Mack Granite chassis experiencing a low frequency vibration.
S4990 2026062026-06-29. Service campaign. STRUCTURE:BODY. The crossmember may come in contact with certain driveshaft U-joint configurations.
CBR-2592-1 2026062026-06-29. Service bulletin. ENGINE. The purpose of this CBR is to provide steps on how to correct a customer complaint of DTC P107B86 accompanied With intermittent loss of throttle.
GDC26-02 2026052026-06-02. Service bulletin. ELECTRICAL SYSTEM; SEAT BELTS; AIR BAGS. Fault diagnostic information for Supplemental Restraint / Airbag Inflation System (SRS)
GDC26-001 2026042026-05-05. Over-the-air update. POWER TRAIN. GDC - Transmission Oil Level Sensor
CBR 2573-1 2026042026-05-05. Service bulletin. POWER TRAIN. CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR 2362-3 2026042026-05-04. Service bulletin. POWER TRAIN. CBR - Mack Carrier Nut Adhesive Change.
CBR 2246-5 0320262026-04-02. Service bulletin. SUSPENSION. CBR - Z Spring Bracket Wear.
CBR 2218-6 0320262026-04-02. Service bulletin. POWER TRAIN. CBR - Parker F3 Hydraulic Pump Troubleshooting.
CBR 2712-7 0320262026-04-02. Service bulletin. ELECTRICAL SYSTEM; UNKNOWN OR OTHER. CBR - No Start Condition After Over the Air Programing.
CBR 2432-2 2026012026-02-03. Service bulletin. STRUCTURE:BODY; VISIBILITY/WIPER. CBR - Mack Chassis - AN And GR Models - Door Glass Shattering.
CBR 2107-22 2026012026-02-02. Service bulletin. ENGINE. CBR - Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions to US22+OBD2023 (DOES NOT APPLY TO AN(4) and PR(4)).
CBR 199 2025122026-01-05. Service bulletin. ENGINE. Vehicles affected by this issue will show coolant runoff on the front rights side of the engine.
CBR 2171-11 2025112025-12-03. Service bulletin. ENGINE; ELECTRICAL SYSTEM. CBR - Mack Temperature Sensor Troubleshooting Guide
CBR 199-6 2025112025-12-03. Service bulletin. ENGINE. CBR - 13 Liter Engines ONLY - Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct Cover Or In Between The Coolant Pump Housing And Oil Cooler Housing.
S4650 1020252025-11-03. Service campaign. SUSPENSION. SC - The vehicle’s torque rod bracket hardware may have incorrect coating that requires different torque specifications.
CBR 2517-1 1020252025-11-03. Service bulletin. VISIBILITY/WIPER. CBR - Wiper Linkage Inspection.
S4584 0920252025-10-01. Service campaign. STEERING; UNKNOWN OR OTHER. The vehicle’s steering shaft support bracket may have been assembled with incorrect hardware.
S4579 0920252025-10-01. Service campaign. UNKNOWN OR OTHER; POWER TRAIN. Mack Trucks has identified that certain truck models may have been assembled with incorrect center bearing mounting hardware and could have been torqued incorrectly. Improper torque can increase the risk of hardware failure. To address this issue, please follow the instructions in this document to replace and correctly torque the center bearing and center bearing mounting bracket hardware.
CBR 2172-5 0820252025-09-02. Service bulletin. ELECTRICAL SYSTEM. CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job ends in a Critical failure, the vehicle will remain in Safe State.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.