Is Your Cadillac or Buick Suffering from Frustrating Engine Problems?
As a technician with over two decades of experience under the hood, I’ve seen countless vehicles towed in with symptoms that point directly to a failing Engine Control Module (ECM). If your CTS, SRX, LaCrosse, or Allure is experiencing issues like a persistent Check Engine Light, rough idling, stalling, no-start conditions, or erratic transmission shifting, a faulty ECM is a very likely culprit. The ECM is the brain of your engine, and when it starts to fail, it can cause a cascade of problems that are impossible to ignore.
The Simple, Reliable Solution: A VIN-Programmed ECM
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. This is a thoroughly tested, genuine used Engine Control Module that we program specifically for your vehicle before it ever leaves our facility. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will flash the unit with the latest, most stable software updates directly from GM. This ensures that the computer is a perfect match for your car’s specific configuration, restoring its original performance and efficiency.
Key Symptoms of a Failing Engine Computer:
- โ Check Engine Light is on with communication-related trouble codes.
- โ Engine cranks but refuses to start.
- โ Noticeable decrease in fuel economy.
- โ The engine runs rough, misfires, or stalls unexpectedly.
- โ Automatic transmission shifts harshly or at the wrong times.
- โ Loss of power and poor acceleration.
Expert Pro Tip from a 20-Year Veteran Technician
Before you install this replacement ECM, take 10 minutes to inspect the main engine wiring harness ground points. On many of these GM 3.6L platforms, a loose or corroded ground connection (often near the engine block or on the chassis rail) can create voltage spikes that damage the original ECM. Cleaning the contact points with a wire brush and ensuring the bolts are tight is a simple step that can prevent the same issue from happening to your replacement module. I’ve seen this simple oversight cause repeat failures in my own shop.
Plug-and-Play Installation: No Dealer Visit Required
Because we handle all the programming, installation is straightforward. This pre-programmed 2004-2007 CTS ECM is designed to be a direct-fit replacement, allowing you to get your vehicle back on the road quickly. While a security relearn procedure may be necessary (a simple process you can do in your driveway), you will not need any specialized scan tools or a trip to the dealer for software flashing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: Find the old module. Its location varies by model (e.g., RH engine compartment on a CTS, lower air cleaner housing on a LaCrosse).
- Disconnect Connectors: Carefully unplug the wiring harness connectors from the old ECM. Inspect the pins for any corrosion or damage.
- Swap the Module: Unbolt and remove the old ECM. Mount the new module securely in its place.
- Reconnect Everything: Plug the wiring harnesses firmly into the new ECM and reconnect the negative battery terminal.
- Perform Security Relearn: If the vehicle doesn’t start, perform the standard GM security relearn procedure (often called the “10-minute relearn”). Instructions are readily available online for your specific model.
Guaranteed Compatibility and Fitment
This module, part number 12592124, is a direct replacement for several service numbers, ensuring broad compatibility. Please match your part number or verify your vehicle is on the list below. This part is guaranteed to fit and function in the following vehicles:
- Cadillac CTS: 2004-2007 (Base, ID 12592124 or 19260507)
- Cadillac SRX: 2004-2006 (3.6L Engine)
- Buick Allure: 2005-2008 (3.6L Engine)
- Buick LaCrosse: 2005-2008 (3.6L Engine)
- Buick Rendezvous: 2004-2006 (3.6L Engine, ID 19260507)
This ECM is a cost-effective and reliable alternative to a new part, sourced from a salvaged vehicle and rigorously tested for full functionality. Restore your car’s performance and drive with confidence again.