{"product_id":"gm-genuine-parts-def-supply-pump-module-84545446-oe-replacement-for-diesel-emission-systems-direct-fit-durability","title":"GM GENUINE PARTS DEF Supply Pump Module 84545446 — OE Replacement for Diesel Emission Systems, Direct-Fit Durability","description":"\u003cp\u003e\u003cstrong\u003eThe GM Genuine Parts 84545446 Emission Reduction Fluid Supply Pump Module is an original-equipment replacement DEF pump designed to restore proper diesel exhaust fluid delivery and maintain your vehicle’s emission control performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis pump module is a factory-grade replacement developed to the specifications used by General Motors for select diesel-equipped vehicles. It supplies diesel exhaust fluid (DEF) from the tank to the dosing system, helping the vehicle’s selective catalytic reduction hardware operate as intended. Built for fit, form, and function parity with the original part, this GM Genuine Parts component is intended to deliver the durability and reliability expected of an OE switch-out. Note: contains a Proposition 65 warning for California — see product labeling for details.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this pump module affect my vehicle’s emission system?\u003c\/h3\u003e\n\u003cp\u003eThe DEF supply pump provides metered fluid to the aftertreatment system that assists in reducing NOx emissions. If the pump fails or performs below specification, the dosing system can be compromised, triggering warning messages and potentially affecting emissions compliance. Replacing it with an OE-grade unit helps reestablish correct DEF delivery and system operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for GM-specified DEF pump modules\u003c\/li\u003e\n  \u003cli\u003eEngineered to meet original flow and pressure requirements\u003c\/li\u003e\n  \u003cli\u003eHelps prevent system faults and emission-related diagnostics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes GM Genuine Parts 84545446 different from aftermarket alternatives?\u003c\/h3\u003e\n\u003cp\u003eThis 84545446 module is produced to GM’s original engineering standards, which ensures the same mounting points, electrical connections, and performance parameters as the factory unit. Aftermarket pumps may vary in tolerances or materials and can require modifications or lead to fitment issues. Choosing a GM Genuine Parts component reduces the risk of installation problems and mismatched performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eManufactured to GM OE specifications for reliable fit and operation\u003c\/li\u003e\n  \u003cli\u003eDesigned for the same service life and durability as the factory item\u003c\/li\u003e\n  \u003cli\u003eBacked by GM parts sourcing and part-number verification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I know when the DEF supply pump needs replacement?\u003c\/h3\u003e\n\u003cp\u003eWarning indicators, reduced DEF pressure, or diagnostic trouble codes related to the dosing circuit commonly point to pump problems. You may also notice service messages, poor aftertreatment performance, or audible signs from the pump area. Proper diagnosis with a scan tool or inspection by a qualified technician confirms whether the pump or another component is at fault.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWarning lights or emission-related fault codes on the instrument cluster\u003c\/li\u003e\n  \u003cli\u003eLow or inconsistent DEF pressure readings during diagnostics\u003c\/li\u003e\n  \u003cli\u003eVisible leaks, unusual noises, or failure to prime when system is active\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eInstallation typically follows the original routing and electrical connections, so no custom modifications are usually required when using this OE module. Basic precautions include depressurizing the DEF system, using clean DEF fluid, and checking seals and wiring harnesses. After installation, run a system check to clear codes and confirm proper dosing operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces factory pump using existing mounting and connectors\u003c\/li\u003e\n  \u003cli\u003eRequires clean DEF fluid and attention to sealing surfaces\u003c\/li\u003e\n  \u003cli\u003ePost-installation system scan recommended to verify operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The GM Genuine Parts 84545446 Emission Reduction Fluid Supply Pump Module is intended for owners, fleet managers, and technicians working on GM diesel models that require a direct-fit DEF pump replacement. It’s the right choice when you want an OEM-quality component to preserve original performance, ensure proper emission-system function, and minimize installation uncertainty. If you need to address DEF delivery faults or restore factory-spec dosing behavior, this GM-specified module is engineered for that purpose.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the 84545446 pump a direct fit for my GM vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — this GM Genuine Parts 84545446 unit is an OE-specified direct replacement for compatible GM diesel models; verify part number against your VIN.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install the DEF pump myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A skilled DIYer can install it using proper tools and system depressurization, but professional installation is recommended for diagnostics and sealing checks.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48081523900574,"sku":"B08NNFHSB8","price":796.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gm-genuine-parts-def-pump-front-view.jpg?v=1785807359","url":"https:\/\/northtrailauto.ca\/products\/gm-genuine-parts-def-supply-pump-module-84545446-oe-replacement-for-diesel-emission-systems-direct-fit-durability","provider":"North Trail Auto","version":"1.0","type":"link"}