WenmarOpen by Wenmar Pro

Service bulletins for the 2020 Mack Anthem

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.

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

By type

By component

By trouble code

Bulletins, newest first
KC-1452021-12-07. Service bulletin. POWER TRAIN. Automated Manual Transmission (AMT) (Spigot Bearing) Input Shaft Repair Kit And Shim Kit, Part Number Information, Reference Guide - US07 And Newer Emissions, Model Year 2008 And Newer
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-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
FSB 211-003_M2021-11-05. Service bulletin. ENGINE AND ENGINE COOLING. Valve Cover Oil Leak at T Joint
KC-21372021-11-05. Service bulletin. STRUCTURE:BODY:DOOR; STRUCTURE. Mack Chassis - Anthem (AN) Water Leak Around Door
KC-21372021-10-01. Service bulletin. STRUCTURE. Mack Chassis - Anthem (AN) Water Leak Around Door
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-2892021-08-02. Service bulletin. EQUIPMENT. Mack Models CHU, CXU, AN, PI - Troubleshooting And Repair Information For The Indel B Refrigerator - All Model Years
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-21132021-07-02. Service bulletin. VISIBILITY. Mack Chassis - Hood Mirror Vibration - Model AN
S75862021-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Connecting Rod Bearing Replacement
KC-21132021-06-04. Service bulletin. VISIBILITY. Mack Chassis - Hood Mirror Vibration - Model AN
S75802021-05-04. Service bulletin. STEERING. V Stay Apex Housing Premature Failure
KC-20612021-05-04. Service bulletin. ELECTRICAL SYSTEM; SUSPENSION. Mack Chassis - Anthem (AN) And Pinnacle (PI) - ABS Modulator Wiring Rubbing Front Shock
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-21032021-04-05. Service bulletin. LATCHES/LOCKS/LINKAGES. Mack Chassis - Model Anthem (AN) - Hood Latch/Cable Sticking Or Binding
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

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