• Top Street Performance GM Standalone '03-'07 LS Truck Drive by Wire Engine and Standard Trans Wiring Harness
  • Top Street Performance GM Standalone '03-'07 LS Truck Drive by Wire Engine and Standard Trans Wiring Harness - front view
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Top Street Performance

GM Standalone '03-'07 LS Truck Drive by Wire Engine and Standard Trans Wiring Harness

GM Standalone '03-'07 LS Truck Drive by Wire Engine and Standard Trans Wiring Harness

SKU: WH1217

$488.88
$488.88 $555.55
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Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.
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Product Details

Features

  • Standalone DBW engine harness for 03–07 GM LS trucks + T56 manual or non-electric auto
  • Compatible with TH350, TH400, Powerglide, 700R4, 200-4R (no electronic shift control needed)
  • Includes fuse/relay box, sensor wiring, fuel injectors, coil packs, OBD2
  • Uses Multec-style injector plug — confirm your injector connector matches

Description

GM Standalone '03-'07 LS Truck Drive by Wire Engine and Standard Trans Wiring Harness

This harness is built for standalone Drive-by-Wire engine management, paired with either a T56 manual transmission or a non-electronically-controlled automatic (TH350, TH400, Powerglide, 700R4, or 200-4R) that doesn't require electronic shift control wiring. It integrates the fuse/relay box, sensor connectors, engine control wiring, fuel pump control, fan control, OBD2 connection, and supporting outputs needed for a clean LS engine control installation.

Use this harness when the engine code, throttle type, transmission type, ECU strategy, and sensor layout match the compatibility section. This harness uses a Multec-style injector plug — confirm your injectors use this connector style before ordering. Confirm pedal and throttle body requirements, oxygen sensor layout, MAP/MAF connections, and power/ground routing before installation.

Specs

Throttle Drive-by-Wire
Injector Plug Style Multec Injector
Harness Length Standard
Fuse Block Included Yes
Quantity Sold as a Kit
Included Connectors Fuse/Relay Box
Fuel Pump Control
Fan Controls
Check Engine Light
IAC and TPS
MAF Sensor
MAP Sensor
Engine Coolant Temp Sensor
Alternator Control
(2) Upstream Oxygen Sensors
Crankshaft Position
Camshaft Position
Fuel Injectors
Coil Packs
Knock Sensors

Engine Fitment

COMPATIBLE WITH
'03-'07 GM Trucks
*Fits 2003-2007 drive-by-wire LS Truck with T56 manual transmission or non-electric automatic (TH350, TH400, Powerglide, 700R4, 200-4R)

NOTES
• Standalone harness — requires a compatible PCM/ECM matched to your engine code.
• Compatible with T56 manual transmissions or non-electronically-controlled automatics (TH350, TH400, Powerglide, 700R4, 200-4R) — not compatible with electronically controlled automatics (4L60E, 4L80E, etc.), which require a transmission-specific harness.
• Does not include a PCM/ECM, throttle body, or accelerator pedal — confirm these separately before ordering.

COMMON VEHICLE APPLICATIONS
- Chevrolet Silverado / GMC Sierra (2003–2007)
- Chevrolet Tahoe/Suburban, GMC Yukon/Yukon XL (2003–2007)
- Cadillac Escalade (2003–2006)
- Hummer H2 (2003–2007)
- Chevrolet Avalanche (2003–2007)
- LS engine swap applications using a 2003–2007 truck-style DBW engine paired with a T56 manual or non-electronic automatic transmission

Q&A

What transmissions is this harness compatible with?
This standalone wiring harness is designed for LS engine applications using a T56 manual transmission or a non-electronically controlled automatic transmission, including the TH350, TH400, Powerglide, 700R4, and 200-4R.

What injector connector style does this harness use?
This harness uses Multec-style fuel injector connectors. Verify that your engine is equipped with Multec injectors before ordering.

Does this include a PCM/ECM?
No. This is a standalone engine wiring harness and does not include a PCM/ECM. A compatible PCM/ECM programmed for your specific engine combination is required.

Does this include fuel injectors?
No. Fuel injectors are not included. This harness includes the fuel injector electrical connectors for connecting to compatible Multec-style injectors.

What's included in this harness kit?
This harness includes wiring for the fuse/relay box, fuel pump control, electric fan controls, check engine light, idle air control (IAC) valve, throttle position sensor (TPS), MAF sensor, MAP sensor, engine coolant temperature sensor, alternator control, two upstream oxygen sensors, crankshaft position sensor, camshaft position sensor, coil packs, and knock sensors.

Does this include the throttle body or accelerator pedal?
No. The throttle body and accelerator pedal are not included and must be purchased separately.

Does this include installation instructions?
Yes. A downloadable installation instruction sheet is available for this harness.

Emissions Notice

This product does not affect vehicle emissions and is not subject to emissions compliance regulations.