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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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10208467
Published by NHTSA2022-03-03
Manufacturer's numberS7627
Manufacturer's date2022-02-25
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

MMD Alternator Pulley

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 MD2020, 2021, 2022

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 2712-7 0320262026-04-02. Service bulletin. CBR - No Start Condition After Over the Air Programing.
CBR 2128-7 2026012026-02-03. Service bulletin. CBR - Engine Control Module (EMS) Software Information - Improvement List (Change Log), US21+OBD2021 Emissions ONLY
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.
CBR-2350 2024072024-08-01. Service bulletin. CBR: Telematics Gateway (TGW) Connect Ability Issues
M-834-001 2024012024-02-02. Service bulletin. 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 2024012024-02-02. Service bulletin. CBR: TGW Will Not Connect After SIM Card Replacement
S3433 2023082023-09-06. Service bulletin. Service Campaign: MMD Steering Column Harness Routing
CBR-2112 2023072023-08-02. Service bulletin. CBR: Programming Failure - Chassis With Cummins Engine And An Allison Transmission