Is Your Buick or Cadillac Running Rough?
If your Buick Allure, LaCrosse, or Cadillac CTS is suffering from intermittent stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition, a failing Engine Control Module (ECM) is a likely culprit. The ECM is the brain of your vehicle’s engine, controlling everything from fuel injection and ignition timing to emissions systems. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep you off the road. This genuine, used ECM, part number 12592124, is the reliable and cost-effective solution you need.
From the Diagnostic Bay
We had a 2007 Cadillac SRX with the 3.6L V6 come into the shop with a bizarre issue. The customer complained of random misfires and the transmission shifting erratically, but only after the engine was fully warmed up. They had already replaced spark plugs, ignition coils, and even a camshaft position sensor at another shop with no success. After hooking up our professional scan tool, we noticed the live data for the fuel trims and ignition advance were jumping all over the place. This pointed us away from a mechanical issue and straight towards the processor. We swapped in a known-good, programmed ECM, and the vehicle ran perfectly. The original module had developed an internal fault that only appeared with heat soak. This is a classic example of how a failing ECM can mimic other component failures, costing you time and money on unnecessary parts.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various communication or processor-related fault codes.
- ✔ Engine cranks but refuses to start.
- ✔ Stalling or hesitation, especially under load or when warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or unstable idle.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Loss of power and poor acceleration.
- ✔ Communication issues with diagnostic scan tools.
Your Plug-and-Play Solution: The 2005-2008 Allure ECM
Replacing an ECM isn’t just about swapping the part; it requires precise programming to match your vehicle’s specific Vehicle Identification Number (VIN) and factory-installed options. Without this critical step, the new module will not communicate with the other systems in your car, and it simply will not start. Our service eliminates the need for an expensive trip to the dealership. When you purchase this module, you provide us with your VIN. We then flash the unit with the latest GM-certified software updates specific to your vehicle. This ensures that the computer you receive is ready for installation, saving you hundreds of dollars in programming fees and towing costs. This ECM is a direct replacement for service numbers 12581144, 12588472, 12592124, and 19260507.
Guaranteed Compatibility
This Engine Control Module is compatible with a range of General Motors vehicles. Please verify your part number and check the fitment list below to ensure this is the correct part for your car. Providing your VIN during checkout is the best way to guarantee a perfect match.
- Buick Allure: 2005-2008 (3.6L)
- Buick LaCrosse: 2005-2008 (3.6L)
- Buick Rendezvous: 2004-2006 (3.6L)
- Cadillac CTS: 2004-2007 (Base)
- Cadillac SRX: 2004-2006 (3.6L)
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN (Vehicle Identification Number) is essential for programming the ECM correctly. It contains specific information about your car’s engine, transmission, and factory options. We use the VIN to load the exact GM software your vehicle needs to run properly, ensuring seamless integration and performance.
Is this part difficult to install?
Physically replacing the ECM is generally straightforward. It’s typically located in the engine bay (e.g., in the lower air cleaner housing on the Allure/LaCrosse). After installation, you may need to perform a security relearn procedure (often called a Passlock or anti-theft relearn), which can usually be done without special tools. Instructions for this procedure are widely available online or in service manuals.
Is this a new part?
No, this is a genuine, used OEM part that has been carefully sourced from a salvaged vehicle. Each unit is inspected and tested before being programmed to ensure it is fully functional and ready for service in your vehicle.
What if my original part number is not on your list?
The part numbers listed (12581144, 12588472, 12592124, 19260507) are the most common service numbers for this module. If your number is different, please contact us with your VIN and original part number. We can verify compatibility and ensure you get the correct module for your application.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM, then yes, this replacement part will resolve the issue. However, it’s crucial to have your vehicle properly diagnosed to confirm the ECM is the root cause and not another sensor or component.