Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Buick, or GMC suffering from frustrating and unpredictable issues like stalling, rough idling, a persistent check engine light, or a complete no-start condition? These are classic signs that the engine’s central computer has failed. This Engine Control Module (ECM), part number 19300016, is the definitive solution to restore your vehicle’s reliability and performance. More than just a part, it’s a comprehensive fix. We handle the most critical step for you: programming. Before this module ships, our experts will flash it with the latest GM-approved software, perfectly matched to your vehicle’s specific VIN. This crucial service saves you a trip to the dealership, avoiding their high programming fees and getting you back on the road faster.
Is Your Vehicle Showing These Symptoms?
A failing ECM can cause a wide range of problems that can be difficult to diagnose. If you’re experiencing any of the following, your engine computer is the likely culprit. I’ve seen these issues countless times in the shop, often leading to a simple ECM replacement.
- ✔ Check Engine Light is on with communication-related codes (e.g., U0100) or internal processor fault codes (e.g., P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The engine misfires, hesitates, or stumbles during acceleration.
- ✔ Automatic transmission shifts erratically or harshly.
- ✔ Intermittent stalling, especially after the engine has warmed up.
From the Diagnostic Bay: The Intermittent Stall Case
A customer brought in a 2009 Acadia that had been to two other shops for a random stalling issue. It would run perfectly for days, then suddenly die at a stoplight and refuse to restart for 20-30 minutes. No consistent codes were stored, making it a diagnostic nightmare. After checking all the basics, I focused on the ECM. In my experience, the processors on these modules can become sensitive to heat over time. I used a heat gun to carefully warm the ECM while the engine was idling, and within minutes, the engine sputtered and died. After it cooled, it started right back up. This confirmed a faulty ECM. We replaced it with a VIN-programmed unit like this one, and the customer never had the problem again. This 2008-2009 STS ECM and its equivalents for other GM models are the reliable fix for these tricky thermal failures.
A Straightforward Guide to Installation
Replacing the ECM is a task many DIYers can handle with basic tools. Our VIN programming service eliminates the most complex step. Follow these general guidelines for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: The module’s location varies. On the STS and CTS, it’s typically on the right-hand side of the engine compartment. On models like the Acadia, Traverse, and Enclave, it’s often found behind the fan shroud.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are usually locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a security or anti-theft relearn procedure to recognize the new ECM. This procedure is simple and typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual or a reliable online resource for the exact steps for your model.
Why Choose a Pre-Programmed 2008-2009 STS ECM?
This isn’t just a replacement part; it’s a complete service. By providing us with your VIN, you receive an ECM loaded with the correct, updated software for your exact vehicle configuration. This ensures all systems—from the engine and transmission to the fuel system and emissions controls—operate exactly as the manufacturer intended. You get a reliable, plug-and-play solution without the extra time and expense of a dealership visit.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles, matching original part numbers including 12623325, 12628387, 12605672, 12630594, and 19300016.
- ✔ 2008-2009 Cadillac STS (with 3.6L engine)
- ✔ 2008-2009 Cadillac CTS (with 3.6L engine, VIN V – 8th digit)
- ✔ 2009 GMC Acadia
- ✔ 2009 Chevrolet Traverse
- ✔ 2009 Buick Enclave
- ✔ 2009 Saturn Outlook
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming involves loading the Engine Control Module with the specific software file for your vehicle’s unique Vehicle Identification Number (VIN). This file contains all the correct parameters for your engine, transmission, and options. Without it, the vehicle may not start, run poorly, or have warning lights. Our service handles this for you, so the part is ready for installation.
Do I need to do anything after installing this ECM?
In most cases, you will need to perform a simple security relearn procedure, also known as a Passlock or anti-theft relearn. This allows your vehicle’s security system to sync with the new ECM. The procedure typically takes about 30 minutes and requires only your ignition key.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot program or ship your module without it. You can find your VIN on your vehicle’s dashboard (visible through the windshield) or on your registration and insurance documents.
Will this fix my specific problem?
This ECM is the solution for failures within the module itself, which often cause issues like no-start conditions, stalling, and internal fault codes (P0601, etc.). While it solves many common problems, it’s essential to ensure your vehicle has been properly diagnosed. This part will not fix issues caused by faulty sensors, wiring, or other mechanical components.
Is this a genuine GM part?
This is a high-quality replacement module that is fully compatible with the listed GM vehicles. We program it using official GM-sourced software updates to ensure it functions identically to a factory-new part, restoring your vehicle’s original performance and reliability.