Service bulletins for the 2021 Mack LR
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.
163 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
Only bulletins with component: Equipment and accessories are shown. Show all
| KC-2094 Rev 3 | 2023-07-06. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT; ELECTRICAL SYSTEM. Infotainment System - Volume Drop During A Phone Call, Phone Connected Via Bluetooth |
|---|---|
| SLM23-005 | 2023-06-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Service Literature Published and Released in May, 2023 |
| KC-735 | 2022-07-05. Service bulletin. EQUIPMENT. Premium Tech Tool (PTT) - Message For Data Mismatch, Product Configuration Mismatch; Instruction To Run An Accessory Kit Displayed When Attempting To Run Diagnostics For Diagnostic Trouble Codes (DTC) Or Programming - US10+OBD13 And Newer Emissions, |
| KC-627 | 2022-06-07. Service bulletin. EQUIPMENT. Premium Tech Tool ( PTT ) Training Materials And Support Tools |
| KC-651 | 2022-06-07. Service bulletin. EQUIPMENT. Mack Dealer Support Communication - Selecting The Proper SR Area For Creating An eService |
| KC-406 | 2022-02-04. Service bulletin. EQUIPMENT; FUEL SYSTEM, DIESEL. Dye Test Procedure; Fuel System Leak Check - Common Rail Fuel System - US17+OBD16 And Newer Emissions, Common Model Year 2018 And Newer |
| KC-391 | 2022-02-04. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Noise On The AM Radio Band; Thumping, Ticking, Fluttering Sound On AM Radio Band - Model Year 2018 And Newer |
| S7576 | 2021-08-02. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. VECU Software Update |
| S7552 | 2021-02-01. Service bulletin. EQUIPMENT:OTHER:LABELS; STRUCTURE:BODY:DOOR. Incorrect Data on Door Label Set |
| K47547856 | 2020-05-06. 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 |
| K01157283 | 2020-04-03. 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 |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.