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Service bulletin KC-638

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 id10213627
Published by NHTSA2022-06-07
Manufacturer's numberKC-638
Manufacturer's date2022-05-16
NHTSA componentEQUIPMENT; ELECTRICAL SYSTEM

NHTSA's summary

Mack SNM15-007 Vocom Adapter ( 88890300 ) May Lock Up When Updating Firmware

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, Equipment and accessories

Vehicles listed
MACK CHU2015
MACK CXU2015
MACK GRANITE (GU)2015
MACK GU2015
MACK LEU2015
MACK LR2015
MACK LR62015
MACK MRU2015
MACK PINNACLE (CHU)2015
MACK PINNACLE (CXU)2015
MACK TD2015
MACK TERRAPRO (LEU)2015
MACK TERRAPRO (LEU/MRU)2015
MACK TERRAPRO (MRU)2015
MACK TITAN2015
MACK TITAN (TD)2015

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

Recalls for the same vehicles and component
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 2171-11 2025112025-12-03. Service bulletin. CBR - Mack Temperature Sensor Troubleshooting Guide
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.
CBR-471 2024092024-10-03. Service bulletin. CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the parameter YYT is set to "Enable" with Premium Tech Tool.
CBR-2350 2024072024-08-01. Service bulletin. CBR: Telematics Gateway (TGW) Connect Ability Issues
CBR-2383 2024062024-07-03. Service bulletin. CBR - Accelerator Pedal: Inspection Instructions
CBR-2350 2024022024-03-05. Service bulletin. CBR -Telematics Gateway (TGW) Connect Ability Issues
CBR-2347 2024022024-03-05. Service bulletin. CBR - Active "Set Park Brake" Message On Drivers Information Display (DID).
CBR-2333 2024012024-02-02. Service bulletin. CBR: TGW Will Not Connect After SIM Card Replacement
CBR-2112 2023072023-08-02. Service bulletin. CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission