2009-and-newer Gen III HEMI engines came from the factory with variable valve timing, and this plug-and-play VVT harness lets a Terminator X or Terminator X Max ECU control and tune it. It connects to the factory Gen III HEMI VVT sub-harness and to the Power Tap and Input/Output connectors on your Holley EFI main harness.
Specifications:
- Product Type: Harness
- Connectors: (3)
- Requires: Terminator X Firmware and Software V2 Build 50 or later
- Compatible ECUs: Terminator X, Terminator X Max
- Part Number: 558-131
Provides control of the VVT solenoid mounted under the intake manifold.
FAQ
What is the 558-131 harness for?
It lets a Terminator X or Terminator X Max ECU control the VVT solenoid on 2009-and-newer Gen III HEMI engines.
Is any firmware update required?
Yes, it requires Terminator X Firmware and Software V2 Build 50 or later.
How many connectors does it have?
Three connectors, designed to plug and play with the factory VVT sub-harness.

