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Service bulletin CBR 2443 072025

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 id11021325
Published by NHTSA2025-08-04
Manufacturer's numberCBR 2443 072025
Manufacturer's date2025-07-09
NHTSA componentELECTRICAL SYSTEM; SERVICE BRAKES

NHTSA's summary

CBR - The truck’s trailer detection system uses a brief pulse of compressed air through the red trailer supply line to detect a connected trailer, but this pulse can inadvertently re-lock air-actuated tandem slide systems; this procedure outlines a method to mitigate the issue while sliding the trailer tandems.

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

Brakes, Electrical system

Vehicles listed
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
26V2610002026-04-23. SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
25V0260002025-01-21. SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
24V7920002024-10-23. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

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-371-005A 2026092026-10-02. Service bulletin. Jumper Harness Repair for Version 4 Mack Trucks
TSB M-373-003 2026092026-10-02. Service bulletin. Power Cable Alternator Replacement
CBR 2590-3 2026092026-10-02. Service bulletin. Instrument Cluster Going Dark
CBR 2496-18 2026092026-10-02. Service bulletin. The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
CBR 2483-6 2026092026-10-01. Service bulletin. Diagnostic instructions for CAN network communication issues.
CBR 2599 2026082026-09-01. Service bulletin. The purpose of this CBR is to provide support for complaints of trailer braking aggressively.
CBR 2596 2026082026-09-01. Service bulletin. The purpose of this CBR is to provide steps on how to correct a customer complaint of a no crank/engine start condition.
CBR 2429 2026082026-09-01. Service bulletin. This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch Panels and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
TSB M-590-001 0720262026-08-03. Service bulletin. TSB - Wheel Speed Sensor Fitting And Cable Clamping.
CBR 2585-3 0720262026-08-03. Service bulletin. CBR - The purpose of this CBR is to provide support for fault codes C106718 and/or C106818.