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Service bulletin CBR-2387 202409

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 id11008382
Published by NHTSA2024-10-04
Manufacturer's numberCBR-2387 202409
Manufacturer's date2024-09-02
NHTSA componentPOWER TRAIN

NHTSA's summary

CBR: Vehicles Equipped With A Lift Axle - Wheel Speed Fault Code SPN 793, SPN 794 Set When Axle Is Up

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

Transmission and driveline

Vehicles listed
MACK ANTHEM (AN)2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 (the catalog's model; the bulletin names a series or trim of it)
MACK PINNACLE (PI/PN)2018, 2019, 2020, 2021, 2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
MACK PIONEER PR (4)2025 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
24V4240002024-06-09. POWER TRAIN:AXLE ASSEMBLY; STEERING:LINKAGES:TIE ROD ASSEMBLY
19V0470002019-01-21. POWER TRAIN:CLUTCH ASSEMBLY

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
TSB M-913-001 2026092026-10-02. Service bulletin. Parker engine-mounted hydraulic pump service bulletin.
GDC26-001 2026042026-05-05. Over-the-air update. GDC - Transmission Oil Level Sensor
CBR 2573-1 2026042026-05-05. Service bulletin. CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR 2362-3 2026042026-05-04. Service bulletin. CBR - Mack Carrier Nut Adhesive Change.
CBR 2218-6 0320262026-04-02. Service bulletin. CBR - Parker F3 Hydraulic Pump Troubleshooting.
CBR 2482 0720252025-08-04. Service bulletin. CBR - Purpose of this CBR is to address Pop up message for PTO Malfunction when there is not PTO Installed.
S4558 2025062025-07-03. Service campaign. Mack trucks has determined that certain model year 2021-2024 PI models built with 4.19 rear axle ratios could experience elevated axle oil temps under high road speeds. To correct this issue the 4.19 ratio carriers need to be swapped to 3.79 ratio carriers. Follow the instructions below to replace both carriers with new ones.
CBR 2474-1 2025062025-07-01. Service bulletin. CBR - This bulletin provides guidance for identifying and addressing oil intrusion related to the Countershaft Brake (CSB) in AMT-G transmissions.
CBR 2464-1 2025052025-06-02. Service bulletin. Mack Chassis - Rear Axle Overheat
S4088 2024092024-10-04. Service campaign. Service Campaign: Interaxle Driveline Torque