2005-2008 LaCrosse ECM 12592124 Programmed Engine Computer Module

Is Your Buick LaCrosse Running Rough, Stalling, or Refusing to Start?

If your 2005-2008 LaCrosse with the 3.6L engine is giving you headaches—like a persistent Check Engine Light, unpredictable stalling, poor fuel mileage, or a complete no-start condition—a failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine, when the ECM falters, it can cause a cascade of frustrating and confusing problems. In my 20+ years as a diagnostic technician, I’ve seen these exact symptoms hundreds of times, and a faulty ECM is a common diagnosis for this platform.

The Smart Solution: A Pre-Programmed, Ready-to-Install ECM

Forget expensive dealership visits and the hassle of finding a shop that can program a new module. This is a reliable, genuine OEM Engine Control Module, part number 12592124, pulled from a salvaged vehicle and rigorously tested for full functionality. The most significant benefit? We program it specifically for your vehicle using your VIN before it ships. This means it arrives at your door loaded with the latest GM software updates, ready for a straightforward installation. You get a cost-effective repair without the typical programming headaches.

Why Choose This 2005-2008 LaCrosse ECM?

This isn’t just a part; it’s a complete solution designed to get your vehicle running properly again. When you’re dealing with complex electronics, you need a part you can trust.

• ✔ VIN-Programmed Convenience: Arrives flashed with the latest GM software matched to your specific vehicle. No extra programming needed.
• ✔ Solves Common Issues: Directly addresses problems like stalling, no-start, communication error codes, and erratic engine performance.
• ✔ OEM Reliability: A genuine used GM part ensures perfect compatibility and function, unlike many aftermarket alternatives.
• ✔ Cost-Effective Repair: Save hundreds of dollars compared to buying and programming a new module at a dealership.

Plug-and-Play Installation: No Dealer Visit Required

Installing your programmed ECM is a manageable DIY job for those with basic tools. Here is a general guide for the Buick LaCrosse:

1. Safety First: Disconnect the negative terminal from your car’s battery and secure it away from the post.
2. Locate the ECM: On the 3.6L LaCrosse, the ECM is typically found attached to the lower portion of the air cleaner assembly box.
3. Access the Module: You will likely need to remove the top of the air filter box and the air filter itself to gain clear access to the ECM and its mounting bolts.
4. Disconnect the Harnesses: Carefully unclip the electrical connectors from the old ECM. Inspect them for any signs of corrosion or damage as mentioned in our pro tip.
5. Remove the Old ECM: Unbolt the old module from its mounting bracket and remove it from the vehicle.
6. Install the New ECM: Mount your new, pre-programmed ECM in place and securely fasten the bolts. Reconnect the electrical harnesses until they click firmly into place.
7. Reassemble: Reinstall the air filter and air cleaner box assembly.
8. Final Step: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which can often be completed by turning the key to the ‘ON’ position for 10-15 minutes before starting.

Important: After purchase, please send us your vehicle’s 17-digit VIN. We cannot ship your part until we have programmed it. This ensures you receive a module that is 100% ready for your car.

This Module is a Direct Replacement for Service Numbers:

• ✔ 12581144
• ✔ 12588472
• ✔ 12592124
• ✔ 19260507

This part also fits a variety of other GM models, including the Cadillac CTS, SRX, Buick Allure, and Rendezvous with the 3.6L engine. Please verify your part number to ensure compatibility.