# Service bulletin CBR 2598 202608

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: 11036588
- Published by NHTSA: 2026\-09\-01
- Manufacturer's number: CBR 2598 202608
- Manufacturer's date: 2026\-08\-24
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

The purpose of this CBR is to provide steps on how to utilize the injector widget \(within workshop toolbox\) to aid with injection system issues.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036588-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036588-9999.pdf)

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

## Components

Fuel system

## Vehicles listed

- 2026 to 2027 MACK ANTHEM AN \(4\)
- 2026 to 2027 MACK PIONEER PR \(4\)

## Other bulletins for the same vehicles and component

- [GDC25\-007 092025](/bulletins/11023382.md), 2025-09-29, Service bulletin: FUEL/PROPULSION SYSTEM. Reductant Injection Valve Control Bank 1 Unit 1 \- Circuit Open
- [GDC25\-004 092025](/bulletins/11023379.md), 2025-09-29, Service bulletin: FUEL/PROPULSION SYSTEM. Reductant Pressure Sensor \- Circuit Open
- [GDC25\-003 092025](/bulletins/11023378.md), 2025-09-29, Service bulletin: FUEL/PROPULSION SYSTEM. Reductant Return: No Flow Detected
- [GDC25\-002 092025](/bulletins/11023377.md), 2025-09-29, Service bulletin: FUEL/PROPULSION SYSTEM. Low Fuel Pressure
- [CBR 2107\-21 202505](/bulletins/11018813.md), 2025-06-02, Service bulletin: FUEL/PROPULSION SYSTEM; ENGINE. Mack DEF Level \(UQLS\) Sensor Troubleshooting Guide \- US17\+OBD16 Emissions and Newer

JSON: [/v1/bulletins/11036588](/v1/bulletins/11036588)

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