{"product_id":"3-pin-2-5mm-delphi-waterproof-connector-12020403-dj3031ya-2-5-automotive","title":"3-Pin 2.5mm Delphi Series Waterproof Connector 12020403 DJ3031YA-2.5-21 Automotive Wiring Harness","description":"\u003ch2\u003e3-Pin 2.5mm Delphi Series Waterproof Connector — 12020403 \/ DJ3031YA-2.5-21\u003c\/h2\u003e\u003cp\u003eOEM-compatible Delphi-series 3-pin 2.5mm waterproof connector for GM-platform automotive wiring harnesses. Cross-references Delphi\/GM part number 12020403 — used for fuel injector, sensor, and actuator circuits requiring sealed 2.5mm pitch connections. The DJ3031YA-2.5-21 variant features a dual-locking tab (-21) for enhanced retention in high-vibration environments.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin Count\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePitch\u003c\/td\u003e\n\u003ctd\u003e2.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Numbers\u003c\/td\u003e\n\u003ctd\u003e12020403 \/ DJ3031YA-2.5-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Series\u003c\/td\u003e\n\u003ctd\u003eDelphi 2.5mm \/ Weather Pack compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003ePA66 (Nylon 66)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSealing\u003c\/td\u003e\n\u003ctd\u003eRubber wire seal (waterproof)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof Rating\u003c\/td\u003e\n\u003ctd\u003eIP67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking\u003c\/td\u003e\n\u003ctd\u003eDual-tab (-21) for enhanced retention\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +125°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eFuel injector, sensor, actuator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatible Vehicles \u0026amp; Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGM \/ Chevrolet \/ GMC — fuel injector and sensor harness connectors\u003c\/li\u003e\n\u003cli\u003eBuick \/ Pontiac \/ Cadillac — engine management sub-harness\u003c\/li\u003e\n\u003cli\u003eDelphi-supplied OEM harnesses across GM global platforms\u003c\/li\u003e\n\u003cli\u003eAftermarket EFI systems (Holley, MegaSquirt, AEM) using Delphi 2.5mm connectors\u003c\/li\u003e\n\u003cli\u003eCustom engine harness builds requiring sealed 3-pin 2.5mm connections\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Choose This Connector?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ Delphi OEM cross-reference 12020403 — confirmed GM platform fitment\u003c\/li\u003e\n\u003cli\u003e✅ Dual-tab locking (-21) — superior retention vs single-tab in high-vibration engine environments\u003c\/li\u003e\n\u003cli\u003e✅ IP67 rubber wire seal — protects against fuel, oil, and coolant splash\u003c\/li\u003e\n\u003cli\u003e✅ PA66 housing — chemical-resistant for continuous fuel and oil exposure\u003c\/li\u003e\n\u003cli\u003e✅ CE certified — meets EU automotive electrical standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComparison: DJ3031YA-2.5-21 vs DJ3031Y-2.5-21\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eLocking\u003c\/th\u003e\n\u003cth\u003eSealing\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDJ3031YA-2.5-21\u003c\/td\u003e\n\u003ctd\u003eDual-tab\u003c\/td\u003e\n\u003ctd\u003eIP67 sealed\u003c\/td\u003e\n\u003ctd\u003eHigh-vibration engine circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDJ3031Y-2.5-21\u003c\/td\u003e\n\u003ctd\u003eSingle-tab\u003c\/td\u003e\n\u003ctd\u003eIP67 sealed\u003c\/td\u003e\n\u003ctd\u003eStandard engine bay applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12020827 \/ DJ3031Y-2.5\u003c\/td\u003e\n\u003ctd\u003eSingle-tab\u003c\/td\u003e\n\u003ctd\u003eIP67 sealed\u003c\/td\u003e\n\u003ctd\u003eGM fuel injector (Weather Pack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eApplication Scenarios\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFuel injector connector replacement on GM LS-series engines (LS1\/LS2\/LS3)\u003c\/li\u003e\n\u003cli\u003eSensor harness repair on Chevrolet Silverado \/ GMC Sierra Vortec engines\u003c\/li\u003e\n\u003cli\u003eActuator connector restoration on Buick \/ Cadillac engine management harness\u003c\/li\u003e\n\u003cli\u003eCustom EFI harness build using Holley HP EFI or MegaSquirt ECU\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 12020403 and 12020827?\u003c\/strong\u003e\u003cbr\u003eA: Both are Delphi\/GM 3-pin 2.5mm waterproof connectors. 12020403 uses the DJ3031YA-2.5-21 dual-tab housing for enhanced retention. 12020827 uses the standard DJ3031Y-2.5 single-tab Weather Pack housing. Both are IP67 sealed and suitable for injector\/sensor applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What does the \"-21\" suffix mean?\u003c\/strong\u003e\u003cbr\u003eA: The \"-21\" suffix indicates a dual locking tab design, providing stronger retention than the single-tab \"-11\" variant. This is preferred for high-vibration applications such as engine-mounted sensors and injectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What terminals are compatible?\u003c\/strong\u003e\u003cbr\u003eA: Delphi Metri-Pack 280 series female terminals for 0.5–1.5mm² (AWG 20–16) wire. Terminals are sold separately.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1× 3-Pin 2.5mm Waterproof Connector Housing (12020403 \/ DJ3031YA-2.5-21)\u003c\/li\u003e\n\u003cli\u003eTerminals not included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"15cm wire","offer_id":47363752394987,"sku":"14:200002130#15cm wire","price":15.24,"currency_code":"USD","in_stock":true},{"title":"follow me cheaper","offer_id":47363752427755,"sku":"14:200004889#follow me cheaper","price":10.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/3pin-delphi-2.5-connector-overview.webp?v=1769754380","url":"https:\/\/keszoox.com\/products\/3-pin-2-5mm-delphi-waterproof-connector-12020403-dj3031ya-2-5-automotive","provider":"Keszoox","version":"1.0","type":"link"}