# 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.

- Type: Service bulletin
- NHTSA id: 10213627
- Published by NHTSA: 2022\-06\-07
- Manufacturer's number: KC\-638
- Manufacturer's date: 2022\-05\-16
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM

## NHTSA's summary

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

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10213627-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10213627-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- 2015 MACK CHU
- 2015 MACK CXU
- 2015 MACK GRANITE \(GU\)
- 2015 MACK GU
- 2015 MACK LEU
- 2015 MACK LR
- 2015 MACK LR6
- 2015 MACK MRU
- 2015 MACK PINNACLE \(CHU\)
- 2015 MACK PINNACLE \(CXU\)
- 2015 MACK TD
- 2015 MACK TERRAPRO \(LEU\)
- 2015 MACK TERRAPRO \(LEU/MRU\)
- 2015 MACK TERRAPRO \(MRU\)
- 2015 MACK TITAN
- 2015 MACK TITAN \(TD\)

## Recalls for the same vehicles and component

- [17V261000](/recalls/nhtsa/17V261000.md), 2017-04-18: ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

## Other bulletins for the same vehicles and component

- [CBR 2171\-11 202511](/bulletins/11026025.md), 2025-12-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. CBR \- Mack Temperature Sensor Troubleshooting Guide
- [CBR 407 072025](/bulletins/11021333.md), 2025-08-04, Service bulletin: SERVICE BRAKES; ELECTRICAL SYSTEM. CBR \- To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
- [CBR 2488 072025](/bulletins/11021332.md), 2025-08-04, Service bulletin: ELECTRICAL SYSTEM. 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 202409](/bulletins/11008368.md), 2024-10-03, Service bulletin: ELECTRICAL SYSTEM. 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 202407](/bulletins/11005410.md), 2024-08-01, Service bulletin: ELECTRICAL SYSTEM. CBR: Telematics Gateway \(TGW\) Connect Ability Issues
- [CBR\-2383 202406](/bulletins/11003042.md), 2024-07-03, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL. CBR \- Accelerator Pedal: Inspection Instructions
- [CBR\-2350 202402](/bulletins/10251333.md), 2024-03-05, Service bulletin: ELECTRICAL SYSTEM. CBR \-Telematics Gateway \(TGW\) Connect Ability Issues
- [CBR\-2347 202402](/bulletins/10251331.md), 2024-03-05, Service bulletin: ELECTRICAL SYSTEM. CBR \- Active "Set Park Brake" Message On Drivers Information Display \(DID\).
- [CBR\-2333 202401](/bulletins/10249553.md), 2024-02-02, Service bulletin: ELECTRICAL SYSTEM. CBR: TGW Will Not Connect After SIM Card Replacement
- [CBR\-2112 202307](/bulletins/10240231.md), 2023-08-02, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN; ENGINE AND ENGINE COOLING. CBR: Programming Failure \- Chassis With Cummins Engine And An Allison Transmission

JSON: [/v1/bulletins/10213627](/v1/bulletins/10213627)

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