# Service bulletin S7627

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: 10208467
- Published by NHTSA: 2022\-03\-03
- Manufacturer's number: S7627
- Manufacturer's date: 2022\-02\-25
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

MMD Alternator Pulley

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10208467-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10208467-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2020 to 2022 MACK MD

## Other bulletins for the same vehicles and component

- [CBR 2712\-7 032026](/bulletins/11030579.md), 2026-04-02, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. CBR \- No Start Condition After Over the Air Programing.
- [CBR 2128\-7 202601](/bulletins/11028033.md), 2026-02-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. CBR \- Engine Control Module \(EMS\) Software Information \- Improvement List \(Change Log\), US21\+OBD2021 Emissions ONLY
- [CBR 2172\-5 082025](/bulletins/11022289.md), 2025-09-02, Service bulletin: ELECTRICAL SYSTEM. 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 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\-2350 202407](/bulletins/11005410.md), 2024-08-01, Service bulletin: ELECTRICAL SYSTEM. CBR: Telematics Gateway \(TGW\) Connect Ability Issues
- [M\-834\-001 202401](/bulletins/10249557.md), 2024-02-02, Service bulletin: ELECTRICAL SYSTEM. TSB: Some Mack MMD trucks could experience an issue with the ignition lock cylinder sticking. Trucks that experience a sticking lock cylinder could have a lock cylinder that becomes tight or sticks in the start position. If the above condition is found replace the ignition lock cylinder.
- [CBR\-2333 202401](/bulletins/10249553.md), 2024-02-02, Service bulletin: ELECTRICAL SYSTEM. CBR: TGW Will Not Connect After SIM Card Replacement
- [S3433 202308](/bulletins/10241932.md), 2023-09-06, Service bulletin: ELECTRICAL SYSTEM; STEERING. Service Campaign: MMD Steering Column Harness Routing
- [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/10208467](/v1/bulletins/10208467)

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