Standalone ECU support for the Tundra 3UR-FE is rare, and this harness is how you get there without compromising your factory wiring.
The 2021 Toyota Tundra 3UR-FE 3UR-FE runs a proven, torque-focused engine that responds to proper calibration, but aftermarket standalone ECU support for this platform has been limited. The Tuned By Shawn Boomslang PNP Wiring Harness for the Haltech Nexus connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.
Advantages
- Torque delivery that's accurate and consistent at all load levels
- Throttle response calibrated to your actual setup, not Toyota's factory baseline
- Fuel trims that stay stable regardless of temperature or altitude
- Engine behavior that matches your modifications rather than fighting them
- A foundation for builds the stock ECU simply cannot support
Features
- Plug-and-play fitment for 2021 Toyota Tundra 3UR-FE 3UR-FE, all transmission types
- Compatible with Haltech Nexus R3, R5, S2, and S3 ECUs
- No cutting or splicing of factory wiring
- OEM-quality connectors, USA-built by Boomslang Fabrication
- Fully reversible, factory harness preserved
- For competition and off-road use
The Details
Built specifically for this vehicle's connector layout with OEM-spec connectors and correct wire gauge throughout. Your factory harness stays completely untouched and the vehicle can return to stock at any time. In automatic transmission applications, the factory ECU remains in parallel for transmission control while the Haltech Nexus manages the engine.
Kit Includes
- 1x Boomslang PNP wiring harness for 2021 Toyota Tundra 3UR-FE 3UR-FE
- Haltech Nexus ECU sold separately
Fitment
2021 Toyota Tundra 3UR-FE 3UR-FE, All Transmission Types.