# Service bulletin CBR\-2449 202503

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: 11016347
- Published by NHTSA: 2025\-04\-02
- Manufacturer's number: CBR\-2449 202503
- Manufacturer's date: 2025\-03\-12
- NHTSA component: ENGINE

## NHTSA's summary

Cummins Exhaust Aftertreatment System \(EATS\) catalysts may experience cracking, which may be attributed to excessive vertical vibration in the exhaust stack. To mitigate this issue, a modification to the exhaust stack length is required.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016347-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016347-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2016 to 2017 MACK ANTHEM \(AN\)
- 2018 to 2026 MACK ANTHEM \(AN\)
- 2014 to 2018 MACK CXU

## Recalls for the same vehicles and component

- [25V256000](/recalls/nhtsa/25V256000.md), 2025-04-17: ENGINE AND ENGINE COOLING:ENGINE:DIESEL

## 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.
- [S4533 202608](/bulletins/11036596.md), 2026-09-02, Service campaign: ENGINE. Mack Trucks has determined that certain AN model trucks equipped with an MP8 Turbo Compound \(TC\) engine may experience TC Double Idler Gear failure due to incorrect bearing preload. TC units within this population are suspected to be affected, which could result in failure and potential engine damage. For the affected vehicle population, please follow the instructions provided below to remove the TC unit, replace the double idler gear with a new one, and reinstall the TC unit.
- [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.
- [M0304 EC0033 202606](/bulletins/11034136.md), 2026-06-29, Emissions: ENGINE. Mack Trucks has determined that certain vehicles equipped with a model year \(“MY”\) 2017\-2018 MP8 Turbo Compound \(TC\) engine may not meet California and Federal Regulations \(CARB\). This Recall is for updated software that will reduce the amount of time necessary for the system to operate in a cold engine warm\-up strategy and provide health monitoring of the Selective Catalyst Reduction \(SCR\).
- [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.
- [M0039 032026](/bulletins/11030590.md), 2026-04-02, Emissions: ENGINE. Emissions \- EC0039 MST21 Failure to Detect P20EE \- AN, CHU.
- [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.

JSON: [/v1/bulletins/11016347](/v1/bulletins/11016347)

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