4L80E DBW Standalone Wiring Harness – Fits LS2/LS3 Engines 4.8/5.3/6.0 (2003-2007), 18" Extra Length

Swapping an LS engine into something?

This 4L80E standalone wiring harness makes the wiring side of things way less painful.

It's designed for 2003‑2007 GM drive‑by‑wire engines – LS2, LS3, 4.8, 5.3, and 6.0 Vortec – mated to a 4L80E transmission.

Uses a green/blue PCM connector and fuel injector plugs, plus a 5‑wire MAF and 2‑wire alternator setup.

The harness is built with quality copper wire and sleeved with heat‑resistant glass fiber braiding (rated at 1200°F).

It's got an extra 18 inches of length for easier ECU mounting, and the sliding bellows seal helps keep moisture out.

It includes all the dash connections you need – speedometer, tachometer, park/neutral, TCC, malfunction indicator, and a DLC port for diagnostics.

Comes with a detailed English manual to guide you through the install.

Please double‑check compatibility before ordering – this is for drive‑by‑wire (DBW) setups.

If you're doing a custom swap, this harness saves a ton of time vs.

hacking up a factory loom.