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Service bulletins for the 2020 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.

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

By type

By component

By trouble code

Bulletins, newest first
KC-1192021-12-07. Service bulletin. POWER TRAIN. Mack Chassis - Equipped With An Automated Manual Transmission (mDrive, AMT) AMT-C, AMT-D Or AMT-F - Transmission Oil Specifications - Model Years 2010 To 2020
KC-702021-12-07. Service bulletin. STRUCTURE:BODY:HOOD; STRUCTURE. Mack Chassis - Model GR/GU - Hood Warpage
KC-1362021-11-05. Service bulletin. ENGINE AND ENGINE COOLING. Aftertreatment Control Module (ACM) Offline/Not Visible/Missing From Control Unit Information in Premium Tech Tool (PTT) - US10+OBD13 And Newer Emissions
KC-1302021-11-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, OTHER. Air In The Fuel System Tests, Common Rail Fuel System - US17+OBD16 and Newer Emissions
KC-1242021-11-05. Service bulletin. POWER TRAIN. Automated Manual Transmission Gearbox Will Not Shift To High Range After Gearbox Repair; MID 130 PSID 24 FMI 1, P1072-92 Unintentional Disengagement Of High Range - US07 And Newer Emissions, Model Year 2008 And Newer
KC-1152021-11-05. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:GEARS. Automated Manual Transmission ( AMT ) ( I-Shift, mDRIVE ) Equipped Chassis, OBD13 And Newer - Light Turbo Surge ( Chuff ) During Skip Shifting
KC-82021-11-05. Service bulletin. STRUCTURE. (Back Office Only) Mack Chassis - Granite Models (GR) - Body Raised Out Of Position Message Not Dislaying In Driver Information Display - INT-GEN2
FSB 211-003_M2021-11-05. Service bulletin. ENGINE AND ENGINE COOLING. Valve Cover Oil Leak at T Joint
S76102021-11-05. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES, AIR:SLACK ADJUSTERS; SUSPENSION:SUBFRAME/MOUNTING BRACKET. Bump Stop Interference with Brake Slack
KC-3282021-10-01. Service bulletin. ELECTRICAL SYSTEM. Diagnostic Trouble Codes (DTC) P208064, P208464, P242B64 and P246F64 Lighting The Malfunction Indicator Lamp (MIL) - US17+OBD19 And Newer Emissions, Model Years 2020 and Newer
S75742021-08-03. Service bulletin. ELECTRICAL SYSTEM. TECU SOFTWARE UPDATE
KC-702021-08-02. Service bulletin. STRUCTURE. Mack Chassis - Model GR/GU - Hood Warpage
S75762021-08-02. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. VECU Software Update
CBR-152021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. Diagnostic Trouble Codes (DTC) For The Engine Pre-Heat Relay: Supplementary Instructions
KC-3452021-07-02. Service bulletin. STEERING. Mack Chassis - Models GU / GR - Constant Correction To Center
S75802021-05-04. Service bulletin. STEERING. V Stay Apex Housing Premature Failure
SC04222021-04-06. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Canada Non-Compliance DRL overide
FSB 491-0322021-04-05. Service bulletin. EQUIPMENT; POWER TRAIN. Transmission Oil Cooler Hose, Replacement
FSB 258-0412021-04-05. Service bulletin. FUEL SYSTEM, DIESEL; ENGINE. Diesel Exhaust Fluid (DEF) Crystallisation, Dosing valve, Clean
KC-702021-04-05. Service bulletin. STRUCTURE. Mack Chassis - Model GR/GU - Hood Warpage
S75572021-03-03. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. VECU Active code and no MIL Lights
SNM21-0012021-02-01. Service bulletin. ENGINE AND ENGINE COOLING. Improved method for determining which DTC to troubleshoot in a MIL on situation
FSB 284-0702021-01-07. Service bulletin. FUEL SYSTEM, DIESEL; ELECTRICAL SYSTEM:WIRING; EQUIPMENT. DTC P0194-00 and/or P016E-00, Fuel Rail Pressure Sensor (RPS) and wiring harness, Replacement
KC-20622020-12-01. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Mack Chassis - Granite (GR) - Intermittent Or Inoperative Headlights, Front Marker Lights, Turn Signals, And/Or Plow Lights
FSB 491-0322020-12-01. Service bulletin. EQUIPMENT; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. Transmission Oil Cooler Hose, Replacement

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