Is your 2008-2009 Cadillac STS, CTS, or other compatible GM vehicle experiencing frustrating and unpredictable engine issues? Symptoms like a persistent Check Engine Light, rough idling, stalling, poor fuel economy, or even a complete no-start condition often point to a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it malfunctions, it can cause a cascade of performance problems. This replacement ECM, part number 12628387, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
We take the guesswork and high cost out of the equation. Unlike a generic module from a parts store or a salvage yard, this unit is professionally programmed specifically for your vehicle. Before we ship it, we flash it with the latest, most stable software updates from General Motors using the Vehicle Identification Number (VIN) you provide. This means no expensive trips to the dealership for programming. It arrives at your door ready for a straightforward installation, making it a true plug-and-play solution.
From the Diagnostic Bay
We had a 2009 Cadillac CTS come into the shop with an issue that was driving the owner crazy. The car would randomly stall at stoplights, but never threw a consistent trouble code. We checked the fuel system, ignition components, and sensors, but everything tested fine. After hours of diagnostics, we monitored the live data stream from the ECM and noticed erratic readings from the throttle position sensor, even though the sensor itself was new. On a hunch, we connected a known-good ECM. The problem vanished instantly. The original ECM had an internal fault that was corrupting data, causing the intermittent stalling. This is a classic example of how a failing computer can mimic other mechanical issues, making a reliable, correctly programmed replacement essential.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer could be the culprit. Replacing it with our pre-programmed module can resolve these problems and get your vehicle running smoothly again.
- ✔ Persistent and illuminated Check Engine Light
- ✔ Engine stalling or shutting off unexpectedly
- ✔ Rough or erratic engine idle
- ✔ Noticeable decrease in fuel efficiency
- ✔ Hesitation or stumbling during acceleration
- ✔ Difficulty starting the engine or a no-start condition
- ✔ Transmission shifting problems or harsh shifts
- ✔ Communication error codes (e.g., U0100)
Why Choose Our 2008-2009 STS ECM?
Our process is designed for accuracy, reliability, and your convenience. When you order this 2008-2009 STS ECM, you are getting a component that has been meticulously prepared to integrate perfectly with your vehicle’s systems. By programming the module with your VIN, we ensure all factory settings, anti-theft protocols, and engine performance parameters are correct for your specific build. This eliminates compatibility conflicts that can arise from using a generic or improperly matched module.
Guaranteed Compatibility
This module is a direct replacement for several part numbers, ensuring a wide range of fitment. Please verify that your original part number is on this list:
- 12628387
- 12623325
- 12605672
- 12630594
- 19300016
Vehicle Fitment:
This ECM is confirmed to fit the following vehicles with the specified options:
- 2008-2009 Cadillac STS: Electronic Control Module; (RH engine), 3.6L
- 2008-2009 Cadillac CTS: Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
- 2009 GMC Acadia: Electronic Control Module; (behind fan shroud)
- 2009 Chevrolet Traverse: Electronic Control Module; (behind fan shroud)
- 2009 Saturn Outlook: Electronic Control Module; (behind fan shroud)
- 2009 Buick Enclave: Electronic Control Module; (behind fan shroud)
Don’t let a faulty ECM keep you off the road. Restore your vehicle’s brainpower and driving confidence with this professionally programmed, ready-to-install Engine Control Module. Simply provide your VIN at checkout and let us handle the complex part, so you can get back to enjoying a smooth, reliable ride.
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. This ECM comes fully programmed to your vehicle’s specific VIN before it is shipped. It is a plug-and-play solution, saving you the time and expense of a dealership visit.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. This is crucial for us to load the correct GM software and vehicle-specific calibrations onto the module.
Is any special procedure needed after I install it?
In many cases, a security relearn procedure may be necessary to sync the new ECM with your vehicle’s anti-theft system. This is a simple procedure that can typically be done without special tools and instructions can be readily found online for your specific model.
How can I be sure this part will fit my vehicle?
Please match your original part number to one of the compatible numbers listed (12628387, 12623325, etc.). You can also check the detailed fitment list provided. Providing your VIN ensures we program it correctly for your exact vehicle configuration.
What is the difference between an ECM, ECU, and PCM?
The terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) typically refer to the same component. PCM (Powertrain Control Module) is a more integrated unit that controls both the engine and the transmission. For this application, the part is an ECM.