Restore Your Engine’s Performance and Reliability
The Engine Control Module (ECM) is the central computer of your 2008-2009 Cadillac STS, CTS, or other compatible GM vehicle. It meticulously manages critical functions like fuel delivery, ignition timing, emissions systems, and automatic transmission performance. When this vital component begins to fail, it can trigger a host of confusing and severe drivability issues, from a simple check engine light to a no-start condition that leaves you stranded. This replacement Engine Control Module, part number 19300016, is the definitive solution to restore your vehicle’s factory performance and peace of mind.
From the Diagnostic Bay
We recently worked on a 2009 GMC Acadia that had its owner chasing ghosts. The vehicle had a persistent, random misfire and a stubborn P0606 (ECM Processor Fault) code. The owner had already spent a significant amount on new spark plugs, ignition coils, and even a fuel injector, but the problem remained. The symptoms were intermittent, making diagnosis a true challenge. After our technicians verified that all the wiring, power, and grounds to the ECM were intact, the evidence pointed directly to an internal failure of the module itself. We installed a new ECM programmed specifically to the Acadia’s VIN. The result was immediate: the misfire was gone, the check engine light stayed off, and the engine ran smoothly. It’s a powerful reminder that correctly identifying a faulty control unit from the start can save both time and money.
Common Symptoms of a Failing ECM
If your vehicle is experiencing any of the following issues, a faulty engine computer may be the culprit. A failing module can often mimic other sensor or component failures, making diagnosis difficult. Look out for these common warning signs:
- ✔ The Check Engine Light is illuminated, often with processor-related fault codes (e.g., P0601, P0606).
- ✔ Your engine misfires, stumbles, hesitates, or stalls unexpectedly while driving or idling.
- ✔ A sudden and unexplained decrease in fuel economy.
- ✔ The engine cranks but refuses to start, even with a healthy battery and starter.
- ✔ Erratic or harsh shifting from the automatic transmission.
- ✔ Intermittent problems that appear and disappear without a clear pattern.
- ✔ Loss of communication with diagnostic scan tools.
Why Choose Our Pre-Programmed 2008-2009 STS ECM?
This isn’t just a part in a box; it’s a complete, ready-to-install solution. The primary challenge with replacing an ECM is the required programming, which typically necessitates an expensive visit to a dealership. We eliminate that step. Our expert technicians use your vehicle’s unique Vehicle Identification Number (VIN) to flash this module with the latest, most stable software directly from General Motors. This crucial step ensures the ECM communicates flawlessly with your vehicle’s other electronic systems, corrects common software-related issues, and restores the precise operational parameters your engine was designed for. By ordering a pre-programmed 2008-2009 STS ECM from us, you get a part that is truly plug-and-play, saving you hundreds in dealer programming fees.
Simple Process, Lasting Results
- Confirm Fitment: Verify that this part (19300016 or a compatible cross-reference) is correct for your vehicle.
- Place Your Order: Add the item to your cart and complete the purchase.
- Provide Your VIN: Simply reply to your order confirmation email with your vehicle’s 17-digit VIN.
- We Program It: Our technicians will flash the module with the correct GM software for your specific vehicle.
- Install and Drive: We ship the module directly to you, ready for installation.
Guaranteed Compatibility
This Engine Control Module is a direct replacement for the following GM part numbers: 12623325, 12628387, 12605672, 12630594, and 19300016. It is confirmed to fit the following vehicles:
- 2008-2009 Cadillac STS (3.6L)
- 2008-2009 Cadillac CTS (3.6L, VIN V)
- 2009 GMC Acadia
- 2009 Chevrolet Traverse
- 2009 Saturn Outlook
- 2009 Buick Enclave
Frequently Asked Questions
Do I need to do any additional programming after installation?
No. This ECM arrives fully programmed to your VIN and is ready for installation. In some vehicles, a simple security relearn procedure (also known as a key relearn) may be necessary. This can typically be done without any special tools and we can provide instructions upon request.
Where is the ECM located on my vehicle?
The location can vary. On the 2008-2009 Cadillac STS and CTS, it is usually found in the engine compartment on the right-hand (passenger) side. For the GM SUVs (Acadia, Traverse, Outlook, Enclave), it is often located behind the engine’s cooling fan shroud. We always recommend consulting a service manual for your specific model to confirm the exact location.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) is easy to find. It is located on your vehicle’s registration, your insurance card, and on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a new or used part?
This is a high-quality, genuine GM-spec replacement part that has been thoroughly inspected and tested. It is programmed with the latest software to meet or exceed original factory specifications, ensuring long-term reliability.
What happens if I provide the wrong VIN?
The programming is specific to the VIN. An incorrect VIN will result in a module that will not work with your vehicle. Please double-check the VIN from your vehicle’s dashboard or documentation before sending it to us to ensure a successful installation.