# Service bulletin CBR 2522\-5 202601

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: 11028047
- Published by NHTSA: 2026\-02\-03
- Manufacturer's number: CBR 2522\-5 202601
- Manufacturer's date: 2026\-01\-31
- NHTSA component: ENGINE

## NHTSA's summary

CBR \- Frequent Parked Regeneration Requests \- Models PR \(4\), AN \(4\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028047-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028047-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2026 MACK ANTHEM AN \(4\)
- 2025 to 2026 MACK PIONEER PR \(4\)

## Other bulletins for the same vehicles and component

- [TSB M\-913\-001 202609](/bulletins/11037730.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Parker engine\-mounted hydraulic pump service bulletin.
- [TSB M257005 202608](/bulletins/11036590.md), 2026-09-01, Service bulletin: ENGINE. 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 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\-2592\-1 202606](/bulletins/11034135.md), 2026-06-29, Service bulletin: ENGINE. 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 202606](/bulletins/11034133.md), 2026-06-29, Service bulletin: ENGINE. The purpose of this CBR it to provide release notes for the recent Engine ECU software.
- [CBR\-2586\-1 202606](/bulletins/11034129.md), 2026-06-29, Service bulletin: ENGINE. The purpose of this CBR is to address issues of exhaust stack rotation on version 4 products.
- [CBR 2465\-6 202605](/bulletins/11033131.md), 2026-06-02, Service bulletin: ELECTRICAL SYSTEM; ENGINE. CBR to diagnosis issues with the Proactive Engine Restart system and Hood Open message.
- [S4757 022026](/bulletins/11029456.md), 2026-03-03, Service campaign: ENGINE. 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 202601](/bulletins/11028052.md), 2026-02-03, Service campaign: ENGINE. CBR MCO/VECI Label Reprint.
- [CBR 2535 202512](/bulletins/11027011.md), 2026-01-05, Service bulletin: ENGINE. The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.

JSON: [/v1/bulletins/11028047](/v1/bulletins/11028047)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20CBR%202522-5%20202601&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11028047&vehicle=Service%20bulletin%20CBR%202522-5%20202601)