# Service bulletin GDC25\-004 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.

- Type: Service bulletin
- NHTSA id: 11023379
- Published by NHTSA: 2025\-09\-29
- Manufacturer's number: GDC25\-004 092025
- Manufacturer's date: 2025\-09\-29
- NHTSA component: FUEL/PROPULSION SYSTEM

## NHTSA's summary

Reductant Pressure Sensor \- Circuit Open

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023379-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11023379-9999.pdf)

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

## Components

Fuel system

## Vehicles listed

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

## Other bulletins for the same vehicles and component

- [CBR 2598 202608](/bulletins/11036588.md), 2026-09-01, Service bulletin: FUEL/PROPULSION SYSTEM. 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 092025](/bulletins/11023382.md), 2025-09-29, Service bulletin: FUEL/PROPULSION SYSTEM. Reductant Injection Valve Control Bank 1 Unit 1 \- 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 2431 072025](/bulletins/11021324.md), 2025-08-04, Service bulletin: FUEL/PROPULSION SYSTEM. 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 072025](/bulletins/11021322.md), 2025-08-04, Service bulletin: FUEL/PROPULSION SYSTEM. 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 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
- [S4342\-202502](/bulletins/11014710.md), 2025-03-03, Service bulletin: FUEL/PROPULSION SYSTEM; ENGINE. 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.

JSON: [/v1/bulletins/11023379](/v1/bulletins/11023379)

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