Holley EFI Harness
2009+ Dodge Gen III HEMI VVT Engines
558-131
Overview:
The Holley EFI Gen III Hemi VVT Harness is a precision-engineered wiring solution designed 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 tuners and enthusiasts to fully control and optimize the VVT system for enhanced engine performance and efficiency. Ideal for those upgrading or building a high-performance Gen III HEMI setup, this plug-and-play harness simplifies installation while unlocking advanced tuning capabilities.
By providing direct control over the VVT solenoid located under the intake manifold, this harness ensures accurate timing adjustments that can improve throttle response, fuel economy, and overall drivability. Whether you are a professional tuner or a dedicated enthusiast, the Holley EFI VVT harness is an essential component for maximizing the potential of your Gen III HEMI engine.
Key Features:
Designed to integrate flawlessly with factory wiring and Holley EFI systems, this harness offers a range of features that enhance functionality and ease of use:
- Plug-and-play compatibility with the factory Gen III HEMI VVT sub-harness
- Direct connection to Holley EFI HEMI Main Harness via Power Tap and Input/Output connectors
- Precise control of the VVT solenoid located under the intake manifold
- Includes three robust connectors for secure and reliable electrical connections
- Supports tuning of Variable Valve Timing for improved engine performance
- Compatible with Holley Terminator X and Terminator X Max ECU platforms
- Eliminates the need for complex wiring modifications or splicing
- Durable construction designed to withstand engine bay conditions
Construction & Design:
The Holley EFI Gen III Hemi VVT Harness is built with high-quality materials to ensure durability and reliable signal transmission in demanding automotive environments. The connectors are engineered for a secure fit, resisting vibration and heat commonly found in engine compartments. The harness is designed to interface directly with the factory VVT sub-harness, maintaining OEM-level reliability while enabling advanced electronic control.
Attention to detail in the wiring layout and connector design minimizes installation time and reduces the risk of electrical issues. This harness is a testament to Holley EFI’s commitment to quality and performance in aftermarket engine management solutions.
Installation & Fitment:
Installation is straightforward thanks to the plug-and-play design, which connects directly to the factory Gen III HEMI VVT sub-harness and the Holley EFI main harness. No cutting or splicing of factory wiring is required, preserving the integrity of the vehicle’s electrical system. This harness is specifically designed for 2009 and newer Gen III HEMI engines equipped with VVT, ensuring perfect fitment and compatibility.
Professional installation is recommended for optimal results, especially when integrating with Holley Terminator X or Terminator X Max ECUs. Proper tuning after installation is essential to fully leverage the VVT control capabilities provided by this harness.
What's Included:
- Holley EFI Gen III Hemi VVT Harness assembly
- (3) Connectors for factory and Holley EFI harness integration
- Power Tap and Input/Output connectors for ECU connection
Ideal For:
This harness is ideal for automotive enthusiasts, professional tuners, and performance builders working with 2009 and newer Gen III HEMI engines who want to unlock the full potential of Variable Valve Timing. It is perfect for those upgrading to Holley EFI Terminator X or Terminator X Max ECUs and seeking a reliable, plug-and-play solution to control and tune VVT for improved engine efficiency and power delivery.
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.
Holley EFI Gen III Hemi VVT Harness: Fits Most Chrysler / Dodge Models (2003-2015)
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558-131 Holley EFI 03-15 Chrysler 300 / Dodge Ram 1500 Gen III Hemi VVT Harness. This plug and play VVT harness is designed for Gen III Hemi engines with Variable Valve Timing from 2003 to 2015. Compatible with Terminator X and Terminator X Max ECUs, it allows precise control and tuning of the VVT solenoid for improved engine efficiency and power. Featuring factory VVT sub-harness and Holley EFI main harness connections, it ensures seamless integration and reliable performance for enhanced drivability.
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Holley EFI Harness
2009+ Dodge Gen III HEMI VVT Engines
558-131
Overview:
The Holley EFI Gen III Hemi VVT Harness is a precision-engineered wiring solution designed 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 tuners and enthusiasts to fully control and optimize the VVT system for enhanced engine performance and efficiency. Ideal for those upgrading or building a high-performance Gen III HEMI setup, this plug-and-play harness simplifies installation while unlocking advanced tuning capabilities.
By providing direct control over the VVT solenoid located under the intake manifold, this harness ensures accurate timing adjustments that can improve throttle response, fuel economy, and overall drivability. Whether you are a professional tuner or a dedicated enthusiast, the Holley EFI VVT harness is an essential component for maximizing the potential of your Gen III HEMI engine.
Key Features:
Designed to integrate flawlessly with factory wiring and Holley EFI systems, this harness offers a range of features that enhance functionality and ease of use:
- Plug-and-play compatibility with the factory Gen III HEMI VVT sub-harness
- Direct connection to Holley EFI HEMI Main Harness via Power Tap and Input/Output connectors
- Precise control of the VVT solenoid located under the intake manifold
- Includes three robust connectors for secure and reliable electrical connections
- Supports tuning of Variable Valve Timing for improved engine performance
- Compatible with Holley Terminator X and Terminator X Max ECU platforms
- Eliminates the need for complex wiring modifications or splicing
- Durable construction designed to withstand engine bay conditions
Construction & Design:
The Holley EFI Gen III Hemi VVT Harness is built with high-quality materials to ensure durability and reliable signal transmission in demanding automotive environments. The connectors are engineered for a secure fit, resisting vibration and heat commonly found in engine compartments. The harness is designed to interface directly with the factory VVT sub-harness, maintaining OEM-level reliability while enabling advanced electronic control.
Attention to detail in the wiring layout and connector design minimizes installation time and reduces the risk of electrical issues. This harness is a testament to Holley EFI’s commitment to quality and performance in aftermarket engine management solutions.
Installation & Fitment:
Installation is straightforward thanks to the plug-and-play design, which connects directly to the factory Gen III HEMI VVT sub-harness and the Holley EFI main harness. No cutting or splicing of factory wiring is required, preserving the integrity of the vehicle’s electrical system. This harness is specifically designed for 2009 and newer Gen III HEMI engines equipped with VVT, ensuring perfect fitment and compatibility.
Professional installation is recommended for optimal results, especially when integrating with Holley Terminator X or Terminator X Max ECUs. Proper tuning after installation is essential to fully leverage the VVT control capabilities provided by this harness.
What's Included:
- Holley EFI Gen III Hemi VVT Harness assembly
- (3) Connectors for factory and Holley EFI harness integration
- Power Tap and Input/Output connectors for ECU connection
Ideal For:
This harness is ideal for automotive enthusiasts, professional tuners, and performance builders working with 2009 and newer Gen III HEMI engines who want to unlock the full potential of Variable Valve Timing. It is perfect for those upgrading to Holley EFI Terminator X or Terminator X Max ECUs and seeking a reliable, plug-and-play solution to control and tune VVT for improved engine efficiency and power delivery.
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.
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YEARMAKEMODELSUBMODEL2012 - 2014Chrysler3006.4L 3922006 - 2010Chrysler300C6.1L SRT82002 - 2010DodgeRam5.7L Hemi
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Standard shipping
Free Standard Shipping on orders over $300. Select “Free Shipping” at checkout. *Exclusions apply on oversized and freight items.
Free Easy Returns
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.