84545446 | Genuine GM® Diesel Exhaust Fluid (DEF) Supply Pump Module for Sierra and Silverado

SKU: 84545446 MPN: 84545446

Built to handle constant DEF flow, the Genuine GM Diesel Exhaust Fluid Supply Pump Module. Condition: new. Part number: 84545446, keeps dosing precise under heavy load. Fits Sierra/Silverado 2500–3500 with 6.0 CNG and 6.6 Diesel systems.

$545.00
No Core Charge
3 in stock

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Product Description

Product Name Diesel Exhaust Fluid (DEF) Supply Pump Module Product Name Diesel Exhaust Fluid (DEF) Supply Pump Module
Condition New Condition New
Brand GM® Brand GM®
Part Number 84545446 Part Number 84545446
Vehicle Compatibility
GMC Sierra 2500 HD (2017-2019) GMC Sierra 2500 HD (2017-2019)
GMC Sierra 3500 HD (2017-2019) GMC Sierra 3500 HD (2017-2019)
Chevrolet Silverado 2500 HD (2017-2019) Chevrolet Silverado 2500 HD (2017-2019)
Chevrolet Silverado 3500 HD (2017-2019) Chevrolet Silverado 3500 HD (2017-2019)
Engine Compatibility
Engine 6.0L V8 CNG/Flex/Gas Engine 6.0L V8 CNG/Flex/Gas
Engine 6.6L V8 Diesel Engine 6.6L V8 Diesel
Body & Trim
Body & Trim High Country, LT, LTZ, WT Body & Trim High Country, LT, LTZ, WT
Body & Trim Base, Denali, SLE, SLT Body & Trim Base, Denali, SLE, SLT

Useful Information

Description and Purpose:

This Genuine Diesel Exhaust Fluid (DEF) Supply Pump Module from GM comes in new condition and is identified by Part number: 84545446. The unit draws DEF from the tank, builds stable pressure, and feeds the SCR dosing injector with filtered, measured flow. Designed for 2017–2019 Silverado and Sierra HD vehicles, it maintains the correct delivery rate even during long cycles, towing loads, or extended idle periods.

Why Replacement is Important:

A pump that loses pressure causes diagnostic alerts and unstable dosing; swapping it out prevents derate events and unnecessary roadside downtime.

Impact on Vehicle Performance:

Consistent DEF pressure preserves engine torque under load, keeps emissions systems active, and helps maintain full work capability without interruptions.

Manufacturer Information: 

General Motors® designs automotive technologies built to deliver dependable performance powered by innovation and proven engineering quality.

Tags & Category: DEF Pump Module, Diesel Exhaust Fluid System, Emissions Control Components, GM Truck Parts, Diesel Exhaust Fluid Supply Pump, DEF Pump Module GM, DEF Pump Silverado, DEF Pump Sierra, 6.0L CNG, 6.6L Diesel, HD Truck Emissions, DEF System Pump, GM Emissions Component, Sierra 2500, Sierra 3500, Silverado 2500, Silverado 3500

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.

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  • Icon Truck, Fast Delivery
    Free shipping over $199 Place an order today and receive it on Mar 6
  • Clock Icon
    Orders placed before 7-PM EST will ship same business day
  • Location icon, warehouse pickup point.
    Pickup available usually ready in 24 hours
  • Need it fast? We offer overnight shipping

    Contact us to check if overnight next-day delivery is available for your order - PN: 84545446