Is Your GM Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience under the hood, I’ve seen countless vehicles plagued by frustrating, hard-to-diagnose electronic issues. A faulty Engine Control Module (ECM) is often the culprit behind problems that seem to have no solution, from erratic idling and poor fuel economy to a complete no-start condition. If your Cadillac, Buick, or SRX is giving you headaches, you’ve found the reliable, straightforward solution.
This is a thoroughly tested, used OEM Engine Control Module, service number 12592124. We take the guesswork and high cost out of the repair by pre-programming it specifically for your vehicle using your VIN. This means it arrives at your door with the latest GM software updates already installed, ready for a direct installation.
Why Choose a Pre-Programmed ECM?
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring all factory settings and communication protocols are perfectly matched.
- ✔ Eliminate Dealer Costs: Skip the expensive trip to the dealership for programming. This module is prepared for installation right out of the box.
- ✔ Solve Common Failures: A failing ECM can cause a wide array of symptoms, including persistent misfire codes, transmission shifting problems, and false sensor readings. This is the core component to restore proper function.
- ✔ Cost-Effective Solution: Get the performance of a correctly functioning computer without the high price tag of a new-from-dealer part.
A Technician’s Real-World Experience
“A customer’s ’06 Buick LaCrosse with the 3.6L came in last week chasing a persistent P0304 (Cylinder 4 Misfire) code. They had already replaced the spark plug, ignition coil, and fuel injector on that cylinder, but the misfire wouldn’t go away. After confirming spark and fuel delivery were mechanically sound, we scoped the injector and coil control signals from the ECM. The driver circuit for the #4 coil inside the original ECM was failing intermittently. We installed one of our pre-programmed modules, and the engine ran perfectly smooth. It’s a classic case where the ECM itself is the root cause, a common issue I’ve diagnosed on these 3.6L platforms.”
Simple Installation Guide
Replacing your ECM is a manageable job for a DIYer with basic tools. While the location varies slightly by model (e.g., in the engine compartment for a CTS or under the air cleaner for a LaCrosse), the general process is the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the systems to fully discharge.
- Locate the ECM: Find the existing module. On a 2004-2007 CTS, it’s typically on the right-hand (passenger) side of the engine compartment. On an Allure/LaCrosse, it’s often housed with the air cleaner assembly.
- Disconnect Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect and Secure: Firmly plug the harness connectors into the new module until they click and the locking tabs are secure. Reconnect the negative battery terminal.
- Final Step: Your vehicle may require a security relearn procedure, which can typically be done by cycling the key and is detailed in many online forums or service manuals. This allows the new ECM to sync with your vehicle’s anti-theft system.
Guaranteed Compatibility for Your 2004-2007 CTS ECM
This module is a direct replacement for several part numbers and fits a range of GM vehicles. Please verify your model and options below. This unit is compatible with service numbers: 12581144, 12588472, 12592124, and 19260507.
- Cadillac CTS: 2004-2006 (Base, ID 12592124 or 19260507), 2007 (Base)
- Cadillac SRX: 2004-2006 (3.6L)
- Buick Allure: 2005-2008 (3.6L)
- Buick LaCrosse: 2005-2008 (3.6L)
- Buick Rendezvous: 2004-2005 (ID 19260507), 2006 (3.6L)
IMPORTANT: After completing your purchase, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your part until we have this information to perform the programming.