TIKSCIENCE LS Gen 3 ECM Bench Harness for GM LS1–LS-based PCMs (1999–2007) — 12V OBDII Power & Delphi Connector

The TIKSCIENCE LS Gen 3 ECM Bench Harness is a plug-and-play bench-top programming and diagnostic harness that powers and connects GM Gen III (LS1/4.8/5.3/5.7/6.0/8.1L) ECMs for out-of-vehicle tuning, flashing, and testing.

This harness is built to let technicians, tuners, and engine builders program or troubleshoot Gen III PCMs outside the vehicle using standard tuning suites such as EFI Live, HP Tuners, or TunerCat. It replicates the vehicle’s 12V power and OBDII communications in a compact bench setup, includes a new Delphi/Aptiv connector assembly and robust 18-gauge TXL wiring, and is designed to support Blue/Red and Blue/Green 1999–2007 GM ECMs.

How does this bench harness let me program a Gen III ECM when it’s removed from the car?

The harness provides the required 12V power feed and an OBDII connection so your laptop and tuning software can communicate with the PCM as if it were installed in the vehicle. It includes an adapter power supply and the correct BLUE side connector for Gen III computers.

• Supplies regulated 12V to the BLUE PCM connector and OBDII port
• Standard OBDII port for tuner software connectivity
• Compatible with EFI Live, HP Tuners, TunerCat and other OBDII-based tools
• New Delphi/Aptiv parts and automotive-grade 18 AWG TXL wiring

Which ECMs and model years are supported by this harness?

This bench harness is engineered for GM Gen III electronic control modules spanning LS1 and later small-block families from roughly 1999 through 2007. It covers common LS displacements including 4.3L, 4.8L, 5.3L, 5.7L, 6.0L and 8.1L variants and supports both Blue/Red and Blue/Green PCM shell styles.

• Works with Gen III (LS1/LS-based) PCMs 1999–2007
• Fits 4.3L, 4.8L, 5.3L, 5.7L, 6.0L and 8.1L ECMs
• Supports Blue/Red and Blue/Green PCM connectors
• Bench-tested with ECMs prior to shipment for reliability

What installation steps and connectors are included for bench setup?

Setup is straightforward: plug the harness into a standard wall outlet using the included 12V adapter, attach the BLUE side PCM connector to your ECM, and connect your tuning laptop to the OBDII port. The harness also includes high-temperature nylon split loom to protect wiring during repeated use.

• Includes 12V wall-plug power adapter and OBDII port
• Plug-and-play harness with BLUE PCM connector
• High-temp nylon split loom and secure mounting hardware
• Works with common OBDII tuning workflows and scan tools

Who is this harness designed for? The TIKSCIENCE Gen 3 ECM bench harness is made for professional tuners, performance shops, DIY engine builders, and salvage-repair technicians who need to flash, tune, or diagnose Gen III GM PCMs outside the vehicle. It’s also useful for educational settings where students learn ECU communication and calibration, and for anyone who requires a durable, tested bench solution compatible with industry-standard tuning software.