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Service bulletin GDC25-003 092025

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 id11023378
Published by NHTSA2025-09-29
Manufacturer's numberGDC25-003 092025
Manufacturer's date2025-09-29
NHTSA componentFUEL/PROPULSION SYSTEM

NHTSA's summary

Reductant Return: No Flow Detected

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

Fuel 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.

Other bulletins for the same vehicles and component
CBR 2598 2026082026-09-01. Service bulletin. 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.
GDC25-007 0920252025-09-29. Service bulletin. Reductant Injection Valve Control Bank 1 Unit 1 - Circuit Open
GDC25-004 0920252025-09-29. Service bulletin. Reductant Pressure Sensor - Circuit Open
GDC25-002 0920252025-09-29. Service bulletin. Low Fuel Pressure
CBR 2431 0720252025-08-04. Service bulletin. CBR - This CBR solution addresses crank no start and engine dying issues in some VN (4) and PR (4) models caused by an incorrect fuel line configuration and/or fuel line fitting not seated correctly.
CBR 2425 0720252025-08-04. Service bulletin. CBR - This CBR solution outlines the analysis of temperature changes in sensors T1, T2, and T3 and provides a procedure for inspecting and addressing potential sensor issues related to AHI fuel injection.
CBR 2107-21 2025052025-06-02. Service bulletin. Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer
S4342-2025022025-03-03. Service bulletin. Mack Trucks has determined that a select group of trucks were built with an AHI Module fuel pressure sensor which does not meet our specifications.