Restore Your Vehicle’s Core Performance and Reliability
If you’re dealing with frustrating engine problems in your Cadillac, Buick, or other compatible GM vehicle—like erratic idling, stalling, a persistent Check Engine Light, or a complete no-start condition—a faulty Engine Control Module (ECM) is often the culprit. I’ve spent over two decades in the garage, and I’ve seen firsthand how a failing ECM can mimic a dozen other issues, leading to wasted time and money on incorrect repairs. This replacement ECM, part number 12592124, is the definitive solution to get your vehicle running correctly again.
This isn’t just a part in a box. It’s a comprehensive fix. We take this genuine, used OEM module and professionally flash it with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) after your purchase. This critical step ensures that the module communicates perfectly with your car’s other systems, restoring factory performance and efficiency without a costly trip to the dealership for programming. This is the smart, effective repair for both seasoned mechanics and determined DIYers.
From the Diagnostic Bay
I remember a 2005 Cadillac SRX that came into my shop with a maddeningly intermittent stalling problem. The owner had already replaced the spark plugs and a coil pack, but the issue persisted. No specific misfire codes were stored, just a generic U0100 ‘Lost Communication with ECM’ code that would pop up occasionally. After checking all the wiring and grounds, we focused on the ECM itself. A thermal test—gently heating the module with a heat gun—caused the engine to stall every time. We swapped in a pre-programmed ECM like this one, and the problem was solved instantly. It’s a classic example of how the 2004-2006 SRX ECM can fail without throwing obvious codes, making a reliable replacement essential.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is illuminated with codes like P0601, P0606 (Internal Control Module Memory Check Sum Error).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough, inconsistent idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Automatic transmission shifting problems.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- ✔ Locate the ECM: On the 2004-2006 Cadillac SRX, the ECM is located in the right-hand (passenger side) front of the engine compartment. On other models like the Allure or LaCrosse, it may be under the air cleaner housing. Consult a repair guide for your specific model if unsure.
- ✔ Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the ECM. Do not force them.
- ✔ Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket or the vehicle body.
- ✔ Install the New Module: Mount your new, pre-programmed 2004-2006 SRX ECM in place and secure it with the original hardware.
- ✔ Reconnect and Secure: Firmly plug the wiring harnesses back into the correct sockets on the new module until they click into place.
- ✔ Final Step: Reconnect the negative battery terminal. Your vehicle is now ready to start. In some cases, a security relearn procedure may be necessary, which can typically be done without special tools.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 12581144, 12588472, 12592124, and 19260507. Please verify your part number or consult the list below. This part is guaranteed to fit the following vehicles:
- Cadillac SRX: 2004-2006 (3.6L Engine)
- Cadillac CTS: 2004-2007 (Base models, check ID)
- Buick Allure: 2005-2008 (3.6L Engine)
- Buick LaCrosse: 2005-2008 (3.6L Engine)
- Buick Rendezvous: 2004-2006 (3.6L Engine, check ID)
Frequently Asked Questions
How does the programming process work?
After you place your order, simply send us your vehicle’s 17-digit VIN. Our technicians will use this to load the latest, most stable GM-approved software for your specific car onto the module before we ship it.
Is this a new part?
No, this is a high-quality, fully functional used ECM that has been carefully sourced from a salvaged vehicle and thoroughly tested to ensure it meets OEM performance standards.
Will I need to do anything else after installation?
Because this unit comes pre-programmed to your VIN, it is designed to be a plug-and-play installation. In some GM vehicles, a simple security or anti-theft relearn procedure may be required, which typically involves turning the key on and off in a specific sequence. This procedure can be found in your owner’s manual or online.
What if my part number isn’t an exact match?
This ECM, 12592124, also replaces service numbers 12581144, 12588472, and 19260507. As long as your vehicle is on the compatibility list and your original module is one of these numbers, this part will work perfectly.
Why choose a used, programmed ECM?
You get the reliability of a genuine OEM part combined with the convenience of pre-programming, all at a significant cost savings compared to buying a new module and paying for programming services at a dealership.