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Service bulletins for the 2021 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.

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

By type

By component

By trouble code

Bulletins, newest first
S75972021-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Inlet Valve Spring Replacement
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
KC-21392021-09-02. Service bulletin. ENGINE AND ENGINE COOLING. 11 Liter Engines - Fuel In Oil - Vehicles Built Between October 2020 And June 2021
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
FSB 511-0102021-05-04. Service bulletin. SERVICE BRAKES, AIR. Disc Brake Rotor, Replacement
SC04222021-04-06. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Canada Non-Compliance DRL overide
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
S75522021-02-01. Service bulletin. EQUIPMENT:OTHER:LABELS; STRUCTURE:BODY:DOOR. Incorrect Data on Door Label Set
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
S75452020-12-01. Service bulletin. STEERING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. Draglink Split Pin Inspection
FSB 801-0042020-11-01. Service bulletin. VISIBILITY. Cab Door Glass Bracket, Installation
FSB 258-0392020-11-01. Service bulletin. ENGINE AND ENGINE COOLING. SCR Fittings, One Box, Replacement PM, NOx and Temperature Sensor Fittings
KC-20212020-09-30. Service bulletin. WHEELS:HUBCAP/COVER. Mack Chassis - Stemco Hubcap Plug Will Not Stay In
S75212020-09-03. Service bulletin. ENGINE. GU/GR Fan Ring Seal Modification
K533380752020-06-03. Service bulletin. ENGINE AND ENGINE COOLING. Diagnostic Trouble Codes (DTC) For The Engine Pre-Heat Relay: Supplementary Instructions - US10+OBD13 And Newer Emissions, Model Year 2014 And Newer
K311264412020-06-03. Service bulletin. STRUCTURE:BODY:HOOD. Diagnostic Trouble Code (DTC) P2042-01: Diagnostic Instructions - US17+OBD16 Emissions And Newer
K475478562020-05-06. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Particulate Matter (PM) Sensor Diagnostic Trouble Codes (DTC) Illuminating The Malfunction Indicator Lamp (MIL) - US14+OBD16, US17+OBD16 And Newer Emissions, Model Year 2017 And Newer - To Be Used For EVERY Visit
K011572832020-04-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS; ELECTRICAL SYSTEM. Front Accessory Drive Noise, Alternator Belt Wear, Alternator Belt Tensioner Failure - Model Year 2017 And Newer
S74552020-03-09. Service bulletin. EQUIPMENT. GR/GU ABS valve bracket installed incorrectly

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