Is Your Buick or Cadillac Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating issues like a persistent check engine light, unexplained stalling, poor fuel economy, or erratic engine behavior in your GM vehicle, a failing Engine Control Module (ECM) is a very likely cause. The ECM is the central computer, the ‘brain’ that manages everything from fuel injection and ignition timing to transmission shifts and emissions control. When it starts to fail, it can cause a cascade of problems that are often difficult to diagnose, leading to costly and unnecessary repairs. Don’t let a faulty computer keep you off the road. This genuine, used OEM ECM, part number 12581144, is the reliable and affordable solution you need.
We had a 2007 Cadillac CTS with the 3.6L V6 come into the shop with a complaint of intermittent stalling at stoplights and a random P0606 (ECM Processor Fault) code. The owner had already replaced the spark plugs and an ignition coil with no success. After running a full diagnostic, we monitored the live data from the ECM and noticed erratic sensor readings just before it would stall. We suspected an internal ECM failure. Instead of a costly new unit from the dealer, we sourced a tested, used module like this one. We programmed it to the car’s VIN, performed the security relearn, and the car ran perfectly. The customer saved hundreds of dollars and solved a problem that had been plaguing them for months.
Common Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling or shutting off unexpectedly while driving or idling.
- ✔ Noticeable decrease in fuel efficiency for no apparent reason.
- ✔ Engine misfires, hesitation, or stumbling during acceleration.
- ✔ Difficulty starting the vehicle or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
Why Our VIN-Programmed 2005-2008 Allure ECM is the Smart Choice
Replacing an ECM isn’t as simple as swapping the part. Modern vehicle computers are coded specifically to the Vehicle Identification Number (VIN) of the car they belong to. They control anti-theft systems, specific engine parameters, and optional equipment. Simply installing a used module from another vehicle will result in a no-start condition. Our service eliminates this critical roadblock. When you purchase from us, you provide your vehicle’s VIN. Our technicians then use professional equipment to flash the module with the latest, most up-to-date software directly from GM for your exact vehicle configuration. This ensures the module is ready for installation right out of the box, saving you a trip to the dealership and expensive programming fees.
This module is a direct replacement for several service part numbers, including 12581144, 12588472, 12592124, and 19260507. It is a tested, used component sourced from a salvaged vehicle, offering OEM quality and reliability at a fraction of the cost of a new part. By choosing this solution, you are getting a component designed by GM specifically for your car, ensuring perfect communication with all other vehicle systems.
Guaranteed Fitment for Your Vehicle
This ECM is confirmed to fit the following vehicles with the specified options. Please verify your part number or contact us with your VIN to ensure compatibility.
- Buick Allure: 2005, 2006, 2007, 2008 (3.6L, located in lower air cleaner housing)
- Buick LaCrosse: 2005, 2006, 2007, 2008 (3.6L, located in lower air cleaner housing)
- Buick Rendezvous: 2004, 2005, 2006 (3.6L, located in LH engine compartment)
- Cadillac CTS: 2004, 2005, 2006, 2007 (Base, located in RH engine compartment)
- Cadillac SRX: 2004, 2005, 2006 (3.6L, located in RH front engine compartment)
The key to a successful repair is a quality part and correct programming. This pre-programmed 2005-2008 Allure ECM provides both, giving you the confidence to restore your vehicle’s performance and reliability.
Frequently Asked Questions
Why do I need to provide my vehicle’s VIN?
Your VIN (Vehicle Identification Number) is essential for us to program the ECM with the correct software and calibrations for your specific car. This includes engine size, transmission type, and other options. Without VIN programming, the module will not work and your car will not start.
Is this a new part?
No, this is a genuine OEM part that has been carefully removed from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped. This provides OEM quality at a significant savings over a new part.
Will I need to do anything after installing this ECM?
In many cases, a security relearn procedure (often called a Passlock or Passkey relearn) is required after installation. This is a simple procedure that syncs the new ECM to your vehicle’s anti-theft system and typically involves a sequence of turning the key. Instructions can be easily found online or we can provide guidance. A Crankshaft Variation (CASE) relearn may also be needed, which requires a capable scan tool.
How do I find my original part number?
Your original part number is printed on a sticker on the ECM itself. You will need to locate the module on your vehicle to find it. For the Allure and LaCrosse, it’s typically found in the lower air cleaner housing.
Which part numbers does this module replace?
This ECM is a direct replacement for service part numbers 12581144, 12588472, 12592124, and 19260507. If your original module has any of these numbers, this part will work for you once programmed.