# 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.

- Type: Service bulletin
- NHTSA id: 11021325
- Published by NHTSA: 2025\-08\-04
- Manufacturer's number: CBR 2443 072025
- Manufacturer's date: 2025\-07\-09
- NHTSA component: ELECTRICAL 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021325-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021325-9999.pdf)

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

## Components

Brakes, Electrical system

## Vehicles listed

- 2025 MACK PIONEER PR \(4\)

## Recalls for the same vehicles and component

- [26V261000](/recalls/nhtsa/26V261000.md), 2026-04-23: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
- [25V026000](/recalls/nhtsa/25V026000.md), 2025-01-21: SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
- [24V792000](/recalls/nhtsa/24V792000.md), 2024-10-23: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

## Other bulletins for the same vehicles and component

- [TSB M\-371\-005A 202609](/bulletins/11037821.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. Jumper Harness Repair for Version 4 Mack Trucks
- [TSB M\-373\-003 202609](/bulletins/11037728.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. Power Cable Alternator Replacement
- [CBR 2590\-3 202609](/bulletins/11037725.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. Instrument Cluster Going Dark
- [CBR 2496\-18 202609](/bulletins/11037724.md), 2026-10-02, Service bulletin: ELECTRICAL SYSTEM. The purpose of this CBR is outline the interim software solution for PR\(4\) and AN\(4\).
- [CBR 2483\-6 202609](/bulletins/11037668.md), 2026-10-01, Service bulletin: ELECTRICAL SYSTEM. Diagnostic instructions for CAN network communication issues.
- [CBR 2599 202608](/bulletins/11036589.md), 2026-09-01, Service bulletin: SERVICE BRAKES. The purpose of this CBR is to provide support for complaints of trailer braking aggressively.
- [CBR 2596 202608](/bulletins/11036585.md), 2026-09-01, Service bulletin: ENGINE; ELECTRICAL SYSTEM. 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 202608](/bulletins/11036583.md), 2026-09-01, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. 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 072026](/bulletins/11035510.md), 2026-08-03, Service bulletin: SERVICE BRAKES. TSB \- Wheel Speed Sensor Fitting And Cable Clamping.
- [CBR 2585\-3 072026](/bulletins/11035504.md), 2026-08-03, Service bulletin: ELECTRICAL SYSTEM. CBR \- The purpose of this CBR is to provide support for fault codes C106718 and/or C106818.

JSON: [/v1/bulletins/11021325](/v1/bulletins/11021325)

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