Is Your Buick LaCrosse Running Rough?
If you’re dealing with frustrating issues like stalling at stoplights, a persistent check engine light that won’t go away, poor fuel mileage, or a car that simply refuses to start, a failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine, the ECM controls everything from fuel injection and spark timing to transmission shifting. When it fails, it can cause a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs.
Over my 20+ years in the garage, I’ve seen countless vehicle owners replace perfectly good fuel pumps, sensors, and ignition coils, only to find the root problem was the ECM all along. This is especially true for the 3.6L engine found in many GM vehicles of this era. This listing is for a reliable, fully tested, used OEM ECM, part number 12592124, which is the direct, cost-effective solution to get your car running right again.
“A customer’s 2007 LaCrosse came in last week with an intermittent no-start and a U0100 ‘Lost Communication with ECM’ code. They had already replaced the fuel pump based on another shop’s guess. We traced it to a classic ECM failure. After installing one of our pre-programmed units, the car fired right up and has been running perfectly since. This simple swap saved them from more guesswork and hundreds in wasted diagnostic fees.”
The #1 Benefit: Programmed & Ready for Installation
The biggest hurdle with replacing an ECM is the required programming. A new, unprogrammed module is just a metal box; it won’t work until it’s flashed by a dealership, which can cost hundreds of dollars and add days of downtime. We eliminate that step completely. When you purchase from us, you simply provide your vehicle’s VIN, and we will flash this ECM with the latest, most stable GM-approved software specific to your car. It arrives at your door ready to install.
- โ VIN-Programmed for Your Vehicle: We flash the module before shipping, ensuring it’s a true plug-and-play solution.
- โ Solves Common 3.6L Engine Issues: Corrects no-start conditions, rough idle, stalling, poor acceleration, and false sensor codes.
- โ Avoids Expensive Dealer Fees: No additional programming or flashing is required on your end.
- โ Genuine OEM Part: This is a used, inspected, and tested original equipment part, not a low-quality aftermarket alternative.
- โ Broad Compatibility: This module, identified by service number 12592124, also replaces part numbers 12581144, 12588472, and 19260507.
Easy Installation Guide for your 2005-2008 LaCrosse ECM
On the 2005-2008 Buick LaCrosse with the 3.6L engine, the ECM is conveniently located directly under the air cleaner housing assembly. You can do this job with basic hand tools in under an hour.
- Safety First: Disconnect the negative terminal from your car’s battery and secure it away from the post.
- Access the Module: Loosen the clamps and remove the air intake ducting. Then, unbolt and lift out the entire air cleaner box assembly. The ECM will be visible beneath it.
- Disconnect Connectors: Carefully release the locking tabs and unplug the large electrical connectors from the old ECM. Inspect the pins for any corrosion or damage before proceeding.
- Swap the ECM: Unbolt the old module from its mounting bracket. Secure the new, pre-programmed ECM in its place.
- Reconnect Everything: Firmly plug the electrical connectors into your new ECM until they click into place. Reinstall the air cleaner assembly and intake ducting.
- Final Step: Reconnect the negative battery terminal. The vehicle is now ready to start.
Guaranteed Fitment
This Engine Control Module is a confirmed fit for the following vehicles with the specified options. Please verify your part number or contact us with your VIN if you are unsure.
- Buick LaCrosse / Allure: 2005-2008 (with 3.6L Engine)
- Cadillac CTS: 2004-2007 (Base, check ID 12592124 or 19260507)
- Cadillac SRX: 2004-2006 (with 3.6L Engine)
- Buick Rendezvous: 2004-2006 (with 3.6L Engine or check ID 19260507)
Don’t let a faulty computer keep you off the road. Order this pre-programmed ECM today and restore your vehicle’s performance and reliability with confidence.