Uploaded January 2026 | Updated September 2026, 3 weeks ago

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Unlock the full power of your Holley Dominator or Terminator X MAX ECU with built-in Drive-By-Wire (DBW) control! Learn the correct way to install OEM-style DBW throttle bodies and pedals for GM, Ford, and Mopar applications.

We cover critical safety requirements:
• Use ONLY the Holley-supplied DBW harness (no cutting or modifying!).
• Proper wire routing to avoid RFI/EMI noise from ignition components.
• Mandatory brake-pedal switch wiring for DBW safety operation.

See how the ECU limits throttle during braking and how to restore full pedal control.

For supported throttle bodies/pedals and more EFI tech, visit Holley.com/support or explore Holley’s full line of EFI systems at Holley.com.

Learn More:

holley.com/products/fuel_systems/fuel_injection/dominator_efi/dominator_harnesses/parts/558-406

holley.com/products/fuel_systems/fuel_injection/harnesses_and_wiring/parts/558-422

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