2004–2008 GM 3800 Series III Tuned ECM (P05)

Plug-and-Play Performance for Grand Prix & Buick 3800 Engines

Stop fighting factory security lockouts and lazy performance maps. This is a complete "Buy It Now" tuned ECM for the Series III 3800 engine. I provide the computer already flashed with the security removed and the performance dialed in, making it a true plug-and-play solution for your 2004–2008 GM build.

I’ve meticulously adjusted the timing, idle, rev limiter, MAP, and fuel curves to wake this engine up. Every unnecessary sensor is stripped out of the logic to ensure your 3.8L keeps screaming without the computer trying to "save" itself or going into limp mode.

Price: $240 On Sale $215

🚗 Compatible Vehicles (2004–2008)

This tuned ECM is a direct fit for 3.8L Series III engines found in:

• Pontiac: Grand Prix (2004–2008)

• Buick: LaCrosse (2005–2008)

• Buick: Lucerne (2006–2008)

• Note: This is specifically for the P05 style controller setup.

🔥 Performance Tuning Overview

• VATS/Security Removed: Passlock and factory security features are expertly disabled—starts every time without a BCM.

• Engine Calibration: Meticulously adjusted timing, fuel, MAP, and idle settings for raw power and throttle response.

• Higher Ceiling: The rev limiter is pushed to maximize your power band in the arena.

• Sensor Deletes: Unnecessary sensors are effectively removed to optimize operation for competition and simplify your wiring.

💻 Supported P05 Service Numbers

This product replaces or covers the common P05 ECM part numbers used in this range:

• 12583827 (Primary 2004–2005 controller)

• 12589608 (Commonly found in 2005–2006 models)

• 12604818 (The updated 2007–2008 module)

📦 Shipping & Availability

• Ready to Ship: This is a complete, tested ECM unit provided by Backwoods Racing. No need to mail yours in.

• Domestic Only: Shipping is currently only available within the United States.

⚠️ Disclaimer

For Off-Road / Derby / Racing Use Only. Not intended for highway or emissions-compliant operation. Backwoods Racing LLC is not responsible for engine damage, fire, or injury resulting from the extreme conditions of competition.