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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
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
S75342020-11-01. Service bulletin. ENGINE AND ENGINE COOLING. Remote Diagnostics - ACM and ECM Software Update
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
S7485v22020-07-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. CarPlay SW Update with SEM
S7483v22020-07-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. CarPlay SW Update with Hardware
S7476v22020-07-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. CarPlay SW Update
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
S74952020-06-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. Coolant Drain Line
K180131542020-05-06. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. Vehicles Equipped With A One-Box Emissions Aftertreatment System ( EATS ) - Diagnostic Trouble Codes ( DTC ) P2463 and P2453. US17+OBD16 (GHG17) And Newer Emissions, Common Model Year 2018 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
K595542552020-05-05. Service bulletin. ENGINE AND ENGINE COOLING. EXPIRED - Refer To K47547856 - Debranded Solutions - Mack Chassis - Particulate Matter (PM) Sensor Diagnostic Trouble Codes (DTC) Illuminating The Malfunction Indicator Lamp (MIL); Tech Tip TT-014-2016 - US14+OBD16, US17+OBD16 And Newer Emissions, Common Model Year 2017 And Newer - To Be Used For EVERY Visit
FSB 233-0072020-05-05. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; FUEL SYSTEM, DIESEL. Fuel Filter Housing, Replacement
K011572832020-04-06. Service bulletin. 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
SLM20-0032020-04-03. Service bulletin. BACK OVER PREVENTION: BACK-UP ALARM. Monthly Bulletin Release Letter
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
S74592020-04-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. PI0889 DIFFERENTIAL LOCK ENGAGEMENT STATUS ALARM UPDATE
S74552020-03-09. Service bulletin. EQUIPMENT. GR/GU ABS valve bracket installed incorrectly
S74482020-03-09. Service bulletin. ELECTRICAL SYSTEM:IGNITION; EQUIPMENT; ENGINE. IGNITION CYLINDER REPLACEMENT-CUMMINS ENGINE
K742535352020-02-24. Service bulletin. POWER TRAIN; PARKING BRAKE. Mack Chassis - Granite (GR) Models Equipped With An Allison Transmission And Split Box PTO - "Release Parking Brake" Message Present In Instrument Cluster When Parking Brake Is Released - Model Year 2018 And Newer
K420650422020-02-24. Service bulletin. ENGINE AND ENGINE COOLING. Mack Chassis - 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 2018 Instrument Cluster Update, Model Year 2018 And Newer
K535805142020-01-13. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE. Brake Drum Inspection - Checking Runout, Wear, And Other Characteristics
K318223252020-01-13. Service bulletin. POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Mack Chassis - Differential Carrier Models CRD 125 And CRD 150 - New Differential Axle Seal Installation Tool; New Tool Required For New Input And Output Seal Installation

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