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Service bulletin CBR-2586-1 202606

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 id11034129
Published by NHTSA2026-06-29
Manufacturer's numberCBR-2586-1 202606
Manufacturer's date2026-06-05
NHTSA componentENGINE

NHTSA's summary

The purpose of this CBR is to address issues of exhaust stack rotation on version 4 products.

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

Engine

Vehicles listed
MACK ANTHEM AN (4)2026, 2027 (the catalog's model; the bulletin names a series or trim of it)
MACK PIONEER PR (4)2025, 2026, 2027 (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.

Other bulletins for the same vehicles and component
TSB M-913-001 2026092026-10-02. Service bulletin. Parker engine-mounted hydraulic pump service bulletin.
TSB M257005 2026082026-09-01. Service bulletin. Loose CCV mounting bolts and oil leak at CCV due to cracking of the housing. Mounting hardware found to be under-torqued after the vehicle was delivered.
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-2592-1 2026062026-06-29. Service bulletin. The purpose of this CBR is to provide steps on how to correct a customer complaint of DTC P107B86 accompanied With intermittent loss of throttle.
CBR-2591-1 2026062026-06-29. Service bulletin. The purpose of this CBR it to provide release notes for the recent Engine ECU software.
CBR 2465-6 2026052026-06-02. Service bulletin. CBR to diagnosis issues with the Proactive Engine Restart system and Hood Open message.
S4757 0220262026-03-03. Service campaign. SC - Certain model AN(4)’s and PR’s could experience DEF leaks or crystallization due to the installation of incorrect fasteners for the Urea Dosage Valve.
SC S4742 2026012026-02-03. Service campaign. CBR MCO/VECI Label Reprint.
CBR 2522-5 2026012026-02-03. Service bulletin. CBR - Frequent Parked Regeneration Requests - Models PR (4), AN (4).
CBR 2535 2025122026-01-05. Service bulletin. The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.