Is Your Cadillac STS Experiencing Engine Problems?
If your 2008 or 2009 Cadillac STS is running poorly, stalling, or displaying a persistent check engine light, a failing Engine Control Module (ECM) could be the culprit. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. Don’t let a faulty computer keep your luxury sedan off the road. This direct-replacement engine module is the solution you need to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We had a 2009 Cadillac CTS with the 3.6L V6 come into the shop with a classic mystery issue. The owner had already replaced the spark plugs, ignition coils, and even a fuel injector trying to chase down an intermittent misfire and rough idle. The codes were all over the place—misfire on cylinder 3 one day, random misfire the next. After hours of checking wiring and sensors, we hooked up our scope to the injector drivers at the ECM. We found that the signal for cylinder 3’s injector was erratic. A quick swap with a known-good ECM confirmed our suspicion: the original module’s internal driver was failing. The customer could have saved hundreds of dollars by starting with the vehicle’s brain. This is a perfect example of how a failing 2008-2009 STS Engine Module can mimic other, more common component failures.
Symptoms of a Failing Engine Control Module
A failing ECM can manifest in various ways, often mimicking other sensor or component failures. If you’re experiencing any of the following issues, it’s time to consider your engine computer as the potential source of the problem.
- ✔ Check Engine Light is illuminated with various, often inconsistent, trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling, misfires, or hesitation during acceleration.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Poor transmission shifting performance, such as harsh shifts or getting stuck in gear.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for Your 2008-2009 STS Engine Module
Replacing an ECM isn’t just about swapping hardware. Modern vehicle computers are coded specifically to the vehicle’s Vehicle Identification Number (VIN) and its unique options. This unit eliminates the need for an expensive trip to the dealership for programming. We handle the critical software flashing process for you. When you order, simply provide us with your vehicle’s VIN. We will program the module with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it is ready for installation. In most cases, a simple security relearn procedure is all that’s needed to get your vehicle running perfectly again.
This module is a direct fit for your 2008-2009 Cadillac STS with the 3.6L engine and is also compatible with a range of other GM vehicles, ensuring broad applicability and OEM-level function. It cross-references with multiple part numbers, including 12623325, 12628387, 12605672, 12630594, and 19300016.
Complete Vehicle Fitment List:
- 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)
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to your vehicle’s specific VIN before shipping. This means it arrives ready to be installed. In some cases, a simple key relearn or security relearn procedure may be required, which can typically be done without special tools.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add this as a note during checkout or send it to us in a message referencing your order number. We cannot ship the module until we have this information.
Is this a brand new part from the dealer?
This is a genuine, fully tested OEM component that has been prepared and programmed with the latest GM software for your vehicle. It meets or exceeds all original factory specifications for performance and reliability.
What if my part number isn’t an exact match?
This module is a compatible replacement for several part numbers, including 12623325, 12628387, 12605672, 12630594, and 19300016. As long as your vehicle is on the fitment list and your original part number is one of these, this module will work correctly once programmed to your VIN.
Will this fix my car’s specific problem?
This ECM will resolve issues directly caused by a faulty engine computer. While the symptoms listed are common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the root cause before ordering.