Holley EFI Performance Harnesses

2009+ Dodge / Chrysler / Jeep Gen III HEMI VVT Engines

558-132

Overview:

The Holley EFI Gen III Hemi VVT and SRV Plug and Play Harness is engineered specifically for 2009 and newer Gen III HEMI engines equipped with Variable Valve Timing (VVT). This harness enables seamless integration with Holley’s Terminator X and Terminator X Max ECUs, allowing precise control and tuning of the VVT system for optimized engine performance. Additionally, for vehicles retaining the factory intake manifold with the Short Runner Valve (SRV), this harness includes a dedicated sub harness to utilize the SRV actuator, enhancing low RPM torque and drivability.

Designed for enthusiasts and professional tuners alike, this plug and play solution simplifies the wiring process, ensuring reliable communication between the ECU and the engine’s advanced variable valve and intake systems. It’s an essential upgrade for anyone looking to maximize the potential of their Gen III HEMI engine with modern EFI technology.

Key Features:

This harness offers a comprehensive set of features tailored to the Gen III HEMI VVT and SRV systems:

• Direct plug and play compatibility with the factory Gen III HEMI VVT sub-harness
• Designed to connect seamlessly with Holley EFI HEMI Main Harness via Power Tap and Input/Output connectors
• Provides full control of the VVT solenoid located under the intake manifold for precise valve timing adjustments
• Includes a pre-wired SRV (Short Runner Valve) connector integrated into the sub harness
• Allows utilization of the factory SRV actuator to capitalize on low RPM torque improvements
• Eliminates the need for custom wiring, reducing installation time and potential errors
• Compatible with Holley Terminator X and Terminator X Max ECUs for advanced tuning capabilities

Construction & Design:

The Holley EFI Gen III Hemi VVT and SRV Plug and Play Harness is built with high-quality automotive-grade wiring and connectors designed to withstand the harsh engine bay environment. Each connector is engineered to match factory specifications, ensuring a secure and weather-resistant connection. The harness is carefully routed and bundled to minimize interference and maintain signal integrity, supporting reliable communication between the ECU and engine components.

Holley’s attention to detail in the design ensures that the harness integrates flawlessly with existing factory wiring, preserving the vehicle’s original electrical architecture while enabling advanced EFI functionality.

Installation & Fitment:

Installation is straightforward thanks to the harness’s plug and play design. It connects directly to the factory Gen III HEMI VVT sub-harness and interfaces with the Holley EFI HEMI Main Harness through designated Power Tap and Input/Output connectors. No cutting or splicing of factory wiring is required, preserving vehicle integrity and simplifying future troubleshooting or upgrades.

This harness is specifically designed for 2009 and newer Gen III HEMI engines equipped with VVT and is compatible with stock intake manifolds featuring the Short Runner Valve. It is ideal for use with Holley Terminator X and Terminator X Max ECUs, ensuring full control over VVT and SRV systems.

What's Included:

• Holley EFI Gen III Hemi VVT and SRV Plug and Play Harness
• Pre-wired VVT sub-harness connector
• Pre-wired SRV connector for factory SRV actuator
• Power Tap and Input/Output connectors for Holley EFI HEMI Main Harness integration
• Installation instructions and wiring guide

Ideal For:

This harness is perfect for Gen III HEMI engine owners who want to upgrade to Holley EFI systems while retaining full control over factory VVT and SRV features. It is especially suited for performance enthusiasts, professional tuners, and custom builders seeking a reliable, plug and play wiring solution that unlocks the full potential of their engine’s variable valve timing and intake runner technology.

Holley EFI delivers standalone engine management and EFI systems built for everything from engine swaps to serious horsepower builds. With platforms like Sniper, Terminator X, HP, and Dominator, Holley EFI is aimed at enthusiasts who want modern tuning control, data, and drivability—whether it’s a street car, track car, or full-on race program.