Restore Your Vehicle’s Core Performance and Reliability
Is your Buick, Cadillac, or Rendezvous suffering from frustrating issues like intermittent stalling, a persistent check engine light, or a complete no-start condition? A failing Engine Control Module (ECM) is often the culprit, disrupting communication between critical engine components. This genuine, used OEM Engine Control Module, service number 12592124, is the dependable and cost-effective solution you need. Forget expensive dealership visits and complex programming procedures. We handle the hard part for you.
Before we ship your part, our experienced technicians will flash it with the latest official GM software updates, precisely matched to your vehicle using your VIN. This ensures that when it arrives, it’s a direct-fit, plug-and-play component ready to restore your engine’s proper function, fuel efficiency, and smooth operation. It’s the most straightforward way to get your car back to factory-spec performance.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Buick LaCrosse with the 3.6L engine that had other shops stumped. It had an intermittent no-start and would occasionally stall at stoplights. No consistent codes were stored, just a random U0100 (Lost Communication with ECM) every few weeks. After verifying the wiring harness and power/ground circuits were solid—a step many shops skip—I suspected an internal ECM failure. We swapped in one of our pre-programmed modules, and the problem vanished instantly. The owner had spent nearly a thousand dollars on diagnostics elsewhere, but the real fix was a reliable, correctly programmed 2005-2008 Allure ECM that took less than 30 minutes to install.
Is Your Engine Computer Failing?
A faulty ECM can manifest in numerous ways, often mimicking other sensor or mechanical failures. If you’ve checked the basics and are still having trouble, your engine computer could be the root cause. Here are some of the most common indicators I see in my shop:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Stored diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The vehicle cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough idling, engine misfires, or hesitation during acceleration.
- ✔ Transmission shifting issues or getting stuck in one gear.
- ✔ The engine stalls for no apparent reason, either while driving or at idle.
A Straightforward Guide to Installation
Installing your replacement ECM is a manageable job for a DIYer with basic tools. The key is our pre-programming service, which eliminates the need for specialized scan tools. While exact locations vary by model (e.g., under the air cleaner housing on a LaCrosse, in the engine compartment on a CTS), the general process is similar.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all modules to power down completely.
- Locate the ECM: Find the existing Engine Control Module on your vehicle. It’s a metal box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Most have a locking tab or lever that needs to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the replacement ECM into place. Firmly reconnect all wiring harness connectors, ensuring they click and lock securely.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple key-cycle security relearn procedure to recognize the new ECM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. We will include specific instructions for your vehicle if required.
Verified Vehicle Compatibility
This module is a direct replacement for several service numbers, including 12581144, 12588472, 12592124, and 19260507. We guarantee compatibility with the following vehicles and options. Please provide your VIN upon purchase to ensure we flash the correct software for your specific application.
- Buick Allure: 2005, 2006, 2007, 2008 (with 3.6L engine)
- Buick LaCrosse: 2005, 2006, 2007, 2008 (with 3.6L engine)
- Buick Rendezvous: 2004, 2005, 2006 (with 3.6L engine)
- Cadillac CTS: 2004, 2005, 2006, 2007 (Base models)
- Cadillac SRX: 2004, 2005, 2006 (with 3.6L engine)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the specific GM database for your car and flash the module with the exact software calibration it needs. This includes parameters for the engine, transmission, emissions equipment, and any factory options, ensuring seamless integration and performance.
Is this part difficult to install?
For most DIYers with basic mechanical skills, this is a very manageable installation. Since we pre-program the module, you won’t need any special computer equipment. The main tasks are disconnecting the battery, swapping the physical module, and performing a simple key-cycle relearn procedure if necessary.
What does “used” or “salvaged” mean for this part?
This ECM is a genuine, original equipment (OEM) part that was carefully removed from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional. This provides the reliability of an OEM part at a fraction of the cost of a new one from the dealer.
Will this fix my car’s problem for sure?
This module will correct issues directly caused by a faulty ECM. However, it’s crucial to properly diagnose your vehicle’s problem first. Symptoms like misfires or no-starts can also be caused by bad sensors, wiring, or fuel system components. This part is the solution for a confirmed ECM failure.
Do I need to do anything after installation?
In most cases, after installing the module and reconnecting the battery, you may need to perform a security relearn procedure. This process syncs the new ECM with your vehicle’s anti-theft system. It’s a simple procedure we can provide instructions for, typically involving turning the key to ‘ON’ for about 10 minutes.