Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Buick, or SRX suffering from frustrating issues like intermittent stalling, a persistent Check Engine Light, rough idling, or a sudden drop in fuel economy? These are classic signs that the brain of your engine—the Engine Control Module (ECM)—is failing. In my two decades as a technician, I’ve seen how a faulty ECM can turn a reliable car into a constant headache. This isn’t just an inconvenience; it affects your vehicle’s safety, reliability, and performance. Don’t let a bad computer keep you off the road or lead to more expensive repairs down the line.
We offer a dependable and straightforward solution: a thoroughly tested, used OEM Engine Control Module, part number 12592124. The best part? We handle the most critical step for you. Before this ECM ever leaves our facility, we program it with the latest GM software updates, perfectly matched to your vehicle’s specific VIN. This means you receive a part that is truly ready for installation, eliminating the need for an expensive trip to the dealership for programming. This is the same reliable fix I’ve used in my own shop to solve countless drivability problems for customers who thought they were facing a massive repair bill.
Case Study: A Tricky Diagnosis
A 2007 Buick LaCrosse with the 3.6L V6 came into my bay with a complaint that stumped two other shops: it would randomly stall at traffic lights, but only after it was fully warmed up. There were no consistent trouble codes, just a history of a P0606 (ECM Processor Fault) that would clear itself. After verifying fuel pressure and ignition timing were solid, I focused on the ECM. On hot days, these modules can develop internal faults that only appear under thermal stress. Instead of throwing expensive parts at it, we swapped in one of our pre-programmed ECMs. The customer called a week later, overjoyed. The stalling was gone. This simple, cost-effective part swap solved a months-long problem, reinforcing that a reliable, correctly programmed 2004-2007 CTS ECM is often the key to fixing these phantom electrical issues.
Common Signs of a Failing Engine Computer
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Memory Error), P0606 (Processor Fault), or communication errors (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or unpredictable engine idling.
- ✔ Intermittent stalling, especially when the engine is warm.
- ✔ The transmission shifts erratically or feels harsh.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Installing your programmed 2004-2007 CTS ECM is a manageable job for a DIYer with basic tools. Following these steps ensures a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the ECM: On most compatible models like the CTS and SRX, the ECM is found in the engine compartment on the passenger (RH) side. On the LaCrosse and Allure, it’s typically located under the air cleaner housing. Refer to your vehicle’s service manual for the exact location.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the ECM. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect your vehicle’s negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new ECM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific procedure for your model.
Verified Vehicle Compatibility
This module is a direct-fit replacement for several GM vehicles equipped with the 3.6L engine. Please verify your part number or vehicle application below. This part is compatible with service numbers 12581144, 12588472, 12592124, and 19260507.
- Cadillac CTS: 2004-2007 (Base models)
- 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)
By purchasing this tested and properly programmed 2004-2007 CTS ECM, you are choosing a reliable and economical path to restoring your vehicle’s drivability and engine health. Provide your VIN at checkout and let us handle the technical work so you can get back on the road with confidence.
Frequently Asked Questions
Do I need to do any programming myself?
No. We flash the module with the latest GM software using the VIN you provide during checkout. It arrives ready to be installed. You may need to perform a simple key/security relearn procedure, which takes about 10-15 minutes and requires no special tools.
Is this a new part?
This is a high-quality, used OEM part that has been sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped.
What information do you need from me?
After you place your order, we will need your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the ECM with the correct software for your specific car.
Will this fix my car’s problem for sure?
This ECM will correct issues directly caused by a faulty engine computer. While the symptoms listed are very common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the root cause of your problem before ordering.
What is the difference between all the part numbers listed?
Manufacturers often update part numbers over a vehicle’s production run for minor hardware or software revisions. The numbers 12581144, 12588472, 19260507, and 12592124 are all functionally interchangeable for the listed applications once correctly programmed for your VIN.