Product Description:
This OEM GM engine wiring harness removed from 2004 Pontiac GTO models equipped with the 5.7L LS1 V8 engine. This factory harness is designed to provide full electrical integration between the ECU, engine sensors, ignition system, and fuel system using original GM connector architecture and factory routing.
This harness is commonly used for replacement of damaged, incomplete, or modified factory wiring systems, as well as restoration projects and LS1 drivetrain applications requiring OEM-style electrical compatibility. Proper installation ensures correct communication between engine management components and vehicle systems.
Key Features:
• Part Number: 04GTOEH
• OEM GM engine wiring harness
• Fits 2004 Pontiac GTO LS1 5.7L applications
• Factory-style connector layout and harness routing
• Used OEM component
• Supports full engine management system integration
• Ideal for restoration, repair, or LS1 swap applications
• Harness only (verify all sensors and accessories separately)
Fitment Applications:
Pontiac GTO LS1
• 2004 Pontiac GTO
Installation Notes:
• This listing is for the engine wiring harness only.
• ECU, sensors, brackets, clips, and accessories are not included unless specifically shown.
• Verify fitment before ordering, especially due to wiring and production variation on early LS1 GTO platforms.
• Test fit all connectors prior to final installation.
• Do not modify, cut, or permanently install until compatibility is confirmed.
• Professional installation is strongly recommended for LS-based electrical systems.
• Used OEM harness may show normal wear, aging loom, or cosmetic imperfections.
• Installed or modified items may not be eligible for return.
CONDITION:
Used OEM GM component. This engine wiring harness has been previously installed and removed from a donor vehicle. Expect normal signs of use consistent with age and service history, including light discoloration, tape aging, or minor cosmetic wear to protective loom. Harness is sold as-is and should be inspected and verified prior to installation. Professional inspection and testing are recommended before use.
