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Service bulletin CBR 2521-1 202511

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 id11026037
Published by NHTSA2025-12-03
Manufacturer's numberCBR 2521-1 202511
Manufacturer's date2025-11-04
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

CBR - Xantrex Inverter Sub-hardware Mismatch.

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 PIONEER PR (4)2025, 2026 (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
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 2597 2026082026-09-01. Service bulletin. The purpose of this CBR is to provide steps on how to correct a customer complaint of "Service Required" message for air filter replacement appears in the cluster. There may be no option in PTT or the cluster to reset the air filter service interval.
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.
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.
CBR 2545-3 0720262026-08-03. Service bulletin. CBR - The purpose of this CBR is to provide guidance on fault code U114688.