Restore Peak Performance to Your Vehicle
Is your Cadillac STS, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, poor fuel economy, stalling, or erratic engine behavior? These are classic symptoms of a failing Engine Control Module (ECM), the central computer that governs your engine’s most critical functions. A faulty ECM can disrupt everything from fuel delivery and ignition timing to transmission shifting and emissions control, leaving you with an unreliable and inefficient vehicle. This replacement Engine Control Module, part number 12590032, is the definitive solution to restore your vehicle’s original performance and reliability.
From the Diagnostic Bay
We had a 2006 Cadillac STS 4.4L come into the shop with an intermittent no-start condition that was driving the owner crazy. It would run fine for days, then refuse to start, only to fire right up an hour later. No consistent trouble codes were stored, making it a diagnostic nightmare. After ruling out the fuel pump and crank sensor, we hooked up a scope to the ECM outputs. We discovered the driver circuit for the fuel pump relay inside the original ECM was failing intermittently under certain temperature conditions. We installed a VIN-programmed module just like this one, performed the security relearn, and the car has been starting perfectly ever since. It’s often the component you least suspect that’s causing the most trouble.
Diagnosing a Failing 2006 STS Engine Control Module
When the main computer of your vehicle begins to fail, it can manifest in a variety of ways. If you’re experiencing any of the following symptoms, it’s a strong indicator that your ECM may need replacement. This module is designed to correct these common failure points and get your car running smoothly again.
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Unexplained drop in fuel efficiency
- ✔ Engine stalling or shutting off while driving
- ✔ Rough idling or misfires
- ✔ Difficulty or inability to start the engine
- ✔ Hesitation or stumbling during acceleration
- ✔ Inconsistent or harsh transmission shifting
- ✔ Communication errors with diagnostic scan tools
Plug-and-Play Solution with VIN Programming
The biggest hurdle in replacing a modern vehicle computer is the complex programming required to make it communicate with your specific vehicle. We eliminate that problem entirely. When you purchase this ECM, we will flash it with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures that the module is perfectly matched to your car’s factory settings, options, and security systems. While a simple security relearn procedure (often called a ‘key cycle’) may be necessary upon installation, this pre-programming saves you from expensive trips to the dealership and the need for specialized tools. This is a direct-fit replacement for a wide range of GM vehicles, and is interchangeable with service numbers 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please verify your original part number to ensure compatibility.
Frequently Asked Questions
Is this ECM ready to install when it arrives?
Yes, this Engine Control Module comes pre-programmed to your vehicle’s specific VIN. This means it’s ready for installation right out of the box. In many cases, you may need to perform a simple security relearn procedure, which can typically be done without special tools and instructions can be readily found online for your specific model.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we receive this information, as the programming is specific to your car. You can usually find your VIN on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your registration and insurance documents.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of your original ECM, then yes, this replacement part will solve the problem and allow the light to be cleared. However, if the light is caused by another failing component (like an oxygen sensor or catalytic converter), you will still need to address that separate issue.
What are the compatible part numbers for this module?
This ECM is a direct replacement for several GM service numbers. It is interchangeable with the following: 12590032, 12602044, 12603530, 12605843, 12607096, 12630457, and 19210737. Please check the number on your original module to confirm fitment.
Does this part fit vehicles other than the 2006 Cadillac STS?
Absolutely. This ECM was used across a vast range of General Motors vehicles, including models from Buick, Chevrolet, Pontiac, Saturn, GMC, Isuzu, and Saab. Please refer to the detailed fitment list on this page to confirm it is the correct part for your specific year, make, and model.