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Service bulletin KC-399

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 id10215296
Published by NHTSA2022-07-05
Manufacturer's numberKC-399
Manufacturer's date2022-06-17
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Vehicle Overspeed Warning Comes Active At A Lower Speed Than Expected; Vehicle Overspeed Warning In Driver Information Display (DID) - Model Year 2018 And Newer With New Style Instrument Cluster.

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

Electrical system

Vehicles listed
MACK ANTHEM (AN)2018, 2019, 2020, 2021, 2022, 2023 (the catalog's model; the bulletin names a series or trim of it)
MACK ASET
MACK CH
MACK CHK SERIES
MACK CHU
MACK CHU2018
MACK CL
MACK CLASS 6
MACK CLASS 7
MACK CLASS 8
MACK CRD SERIES
MACK CRD112/113
MACK CRD200
MACK CRD92/93
MACK CS 300
MACK CS 300P
MACK CS SERIES
MACK CV
MACK CX
MACK CXU
MACK CXU2018
MACK DM
MACK DM SERIES
MACK DM400
MACK DM600
MACK DM807
MACK DM809
MACK DM811
MACK DMM SERIES (the catalog's model; the bulletin names a series or trim of it)
MACK E6
MACK E7
MACK F SERIES
MACK FDM
MACK FREEDOM
MACK GRANITE (GR)2018, 2019, 2020, 2021, 2022, 2023 (the catalog's model; the bulletin names a series or trim of it)
MACK GU
MACK GU2018
MACK J-TECH
MACK LE
MACK LR
MACK LR2018, 2019, 2020, 2021, 2022
MACK LR ELECTRIC2020 to 2023
MACK M35AK
MACK M65BX
MACK MACK
MACK MB SERIES
MACK MC400
MACK MC600
MACK MD2020, 2021, 2022, 2023
MACK MH
MACK MIDLINER
MACK MIDR
MACK MILITARY VEHICLE
MACK MR
MACK MR SERIES
MACK MR400
MACK MR600
MACK MRU2018
MACK MS SERIES
MACK MS200P
MACK MS300
MACK MS300P
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, 2023 (the catalog's model; the bulletin names a series or trim of it)
MACK R
MACK RB
MACK RD
MACK RD SERIES
MACK RM SERIES
MACK RW SERIES (the catalog's model; the bulletin names a series or trim of it)
MACK SR70
MACK T200
MACK T2060A
MACK T2090L
MACK T2090LR
MACK T300
MACK TD
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
MACK U
MACK V-MAC
MACK V-MAC III
MACK WL
MACK WS

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

Recalls for the same vehicles and component
24V7920002024-10-23. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20230212023-01-24. Electrical
18V1520002018-03-06. INTERIOR LIGHTING; VISIBILITY:WINDSHIELD WIPER/WASHER; EXTERIOR LIGHTING; ELECTRICAL SYSTEM
17V2610002017-04-18. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CBR 159 2026082026-09-01. Service bulletin. Mack Trucks 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 2018Instrument Cluster Update, Model Year2018 And Newer
CBR 2712-7 0320262026-04-02. Service bulletin. CBR - No Start Condition After Over the Air Programing.
CBR 126 0220262026-03-03. Service bulletin. CBR - The purpose of this solution is to give information on Engine Control Module (EMS) Software content.
CBR 2128-7 2026012026-02-03. Service bulletin. CBR - Engine Control Module (EMS) Software Information - Improvement List (Change Log), US21+OBD2021 Emissions ONLY
CBR 2495-4 2025112025-12-03. Service bulletin. CBR - Carb 24 Phase 1 - 48V Diagnostics Guide.
CBR 2171-11 2025112025-12-03. Service bulletin. CBR - Mack Temperature Sensor Troubleshooting Guide
CBR 2495 0920252025-10-01. Service bulletin. The purpose of the 48V EATS heater system is to provide additional heat to the exhaust stream allowing the EATS to become active earlier during acold start and during engine operation that produces low exhaust gas temperatures.
CBR 2172-5 0820252025-09-02. Service bulletin. CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job ends in a Critical failure, the vehicle will remain in Safe State.
CBR 407 0720252025-08-04. Service bulletin. CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
CBR 2488 0720252025-08-04. Service bulletin. CBR - A significant GPS reporting issue is affecting fleet operations, with trucks maintaining back-office communication but failing to transmit GPS location data.