3-Pin 2.5mm Delphi Series Waterproof Connector 12020403 DJ3031YA-2.5-21 Automotive Wiring Harness

$15.24 USD

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3-Pin 2.5mm Delphi Series Waterproof Connector — 12020403 / DJ3031YA-2.5-21

OEM-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.

Specifications

Parameter	Value
Pin Count	3
Pitch	2.5 mm
OEM Part Numbers	12020403 / DJ3031YA-2.5-21
Connector Series	Delphi 2.5mm / Weather Pack compatible
Housing Material	PA66 (Nylon 66)
Sealing	Rubber wire seal (waterproof)
Waterproof Rating	IP67
Locking	Dual-tab (-21) for enhanced retention
Operating Temperature	-40°C to +125°C
Application	Fuel injector, sensor, actuator
Certification	CE

Compatible Vehicles & Applications

GM / Chevrolet / GMC — fuel injector and sensor harness connectors
Buick / Pontiac / Cadillac — engine management sub-harness
Delphi-supplied OEM harnesses across GM global platforms
Aftermarket EFI systems (Holley, MegaSquirt, AEM) using Delphi 2.5mm connectors
Custom engine harness builds requiring sealed 3-pin 2.5mm connections

Why Choose This Connector?

✅ Delphi OEM cross-reference 12020403 — confirmed GM platform fitment
✅ Dual-tab locking (-21) — superior retention vs single-tab in high-vibration engine environments
✅ IP67 rubber wire seal — protects against fuel, oil, and coolant splash
✅ PA66 housing — chemical-resistant for continuous fuel and oil exposure
✅ CE certified — meets EU automotive electrical standards

Comparison: DJ3031YA-2.5-21 vs DJ3031Y-2.5-21

Part Number	Locking	Sealing	Best For
DJ3031YA-2.5-21	Dual-tab	IP67 sealed	High-vibration engine circuits
DJ3031Y-2.5-21	Single-tab	IP67 sealed	Standard engine bay applications
12020827 / DJ3031Y-2.5	Single-tab	IP67 sealed	GM fuel injector (Weather Pack)

Application Scenarios

Fuel injector connector replacement on GM LS-series engines (LS1/LS2/LS3)
Sensor harness repair on Chevrolet Silverado / GMC Sierra Vortec engines
Actuator connector restoration on Buick / Cadillac engine management harness
Custom EFI harness build using Holley HP EFI or MegaSquirt ECU

FAQ

Q: What is the difference between 12020403 and 12020827?
A: 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.

Q: What does the "-21" suffix mean?
A: 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.

Q: What terminals are compatible?
A: Delphi Metri-Pack 280 series female terminals for 0.5–1.5mm² (AWG 20–16) wire. Terminals are sold separately.