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Service bulletin KC-406

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10207552
Published by NHTSA2022-02-04
Manufacturer's numberKC-406
Manufacturer's date2022-01-19
NHTSA componentEQUIPMENT; FUEL SYSTEM, DIESEL

NHTSA's summary

Dye Test Procedure; Fuel System Leak Check - Common Rail Fuel System - US17+OBD16 And Newer Emissions, Common Model Year 2018 And Newer

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Fuel system

Vehicles listed
MACK ANTHEM (AN)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK CHU2018
MACK CXU2018
MACK GRANITE (GR)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK GRANITE (GU)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK GU2018
MACK LR2018, 2019, 2020, 2021, 2022
MACK LR ELECTRIC2020
MACK MD2020, 2021, 2022
MACK MRU2018
MACK PINNACLE (CHU)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (CXU)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (PI/PN)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK TD2018 to 2019
MACK TE2019 to 2021
MACK TERRAPRO (LEU/MRU)2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
MACK TERRAPRO (MRU)2018, 2019, 2020, 2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
MACK TERRAPRO (TE)2018 (the catalog's model; the bulletin names a series or trim of it)
MACK TERRAPRO (TE)2022 (the catalog's model; the bulletin names a series or trim of it)
MACK TITAN (TD)2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
CBR 2107-21 2025052025-06-02. Service bulletin. Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer
CBR 445- 11 2025052025-06-02. Service bulletin. Vehicles Equipped With a Common Rail Fuel System - Aftermarket Secondary Fuel Filters, Important Information On Approved Filters - US17+OBD16 toUS21+OBD23
CBR-570 2024092024-10-03. Service bulletin. CBR: US17 GHG Common Rail Fuel System Component Electrical Faults - Model Year 2017 To 2024
CBR-2139 2024052024-06-04. Service bulletin. CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil. It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head. A new and improved fuel galley plug has been developed to resolve this issue.
CBR-2315 2023092023-10-03. Service bulletin. CBR: Mack Chassis - Medium Duty - Front Bumper License Plate Mounting Holes
M-258-012 2023092023-10-03. Service bulletin. TSB: Aftertreatment Diesel Exhaust Fluid (DEF) Tank, Level Sensor, Replacement
KC-2094 Rev 32023-07-06. Service bulletin. Infotainment System - Volume Drop During A Phone Call, Phone Connected Via Bluetooth
SLM23-0052023-06-06. Service bulletin. Service Literature Published and Released in May, 2023
KC-331-Ver62023-06-05. Service bulletin. CBR: Model Year 2017 to Current - Fuel Filter Change ( Primary And Secondary ) For The EM - USA17 Emission Engines
M-170-0032023-05-03. Service bulletin. TSB: Vibration Diagnostics