Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Buick, or GMC suffering from baffling electrical gremlins? A faulty Engine Control Module (ECM) is often the culprit behind frustrating issues like erratic idling, poor fuel economy, stalling, or a persistent Check Engine Light. As the ‘brain’ of your vehicle’s engine, a failing ECM can disrupt everything. This isn’t just an inconvenience; it’s a reliability issue that needs a definitive solution. We offer a dependable, plug-and-play fix with this genuine GM Engine Control Module, part number 19300016.
The biggest hurdle in replacing an ECM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. Before this module ships, our experts will program it with the latest official GM software, specifically matched to your vehicle’s VIN. This ensures that when it arrives, it’s ready for installation, saving you time, money, and the headache of scheduling a dealer appointment. This is the most direct path to getting your vehicle back on the road and running as it should.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2009 Acadia that came into the shop with a problem that was driving the owner crazy. It would stall randomly at red lights, but not always. Sometimes it would hesitate on acceleration. No consistent codes were stored, just a few random U0100 (Lost Communication With ECM/PCM) history codes. We checked grounds, wiring, and sensors for hours. Everything seemed fine. On a hunch, I monitored the 5-volt reference signal from the ECM while tapping on the module itself. Sure enough, the voltage would flicker and drop, causing the engine to stumble. The internal processor was failing under heat and vibration. Swapping in a pre-programmed 2008-2009 CTS ECM (which also fits the Acadia) solved the issue instantly. It’s a classic example of how a failing module can create ghost-like symptoms that are impossible to trace to a single sensor.
Is Your Vehicle Showing These Signs of ECM Failure?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty ECM is a likely cause. Look out for:
- ✔ Check Engine Light is illuminated with internal processor codes like P0601, P0602, or P0606.
- ✔ Unexplained stalling or engine shutting off while driving.
- ✔ Vehicle refuses to start, but the battery and starter are good.
- ✔ Noticeable drop in fuel efficiency.
- ✔ Engine hesitates, misfires, or runs rough.
- ✔ Communication errors with scan tools or other modules (U-series codes).
- ✔ Harsh or incorrect automatic transmission shifting.
A Straightforward Guide to Installation
Installing your pre-programmed module is a job most DIYers can handle in under an hour. While locations vary slightly by model, the process is generally the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On the Cadillac CTS and STS, it’s typically on the right-hand (passenger) side of the engine compartment. On the Acadia, Traverse, Enclave, and Outlook, it’s often located behind the fan shroud.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New Module: Mount your new, pre-programmed module in place and secure it with the original hardware.
- Reconnect Everything: Plug the electrical connectors firmly back into the new ECM until they click into place. Reconnect your negative battery terminal.
- Perform Relearn Procedure: Start the vehicle and let it idle for 5-10 minutes. This allows the computer to perform its idle-relearn strategy. A short test drive will help it adapt to other parameters.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles equipped with the 3.6L V6 engine. Please verify your vehicle and options match the list below.
- 2008 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L, VIN V 8th digit)
- 2009 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L, VIN V 8th digit)
- 2008 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
- 2009 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
- 2009 GMC Acadia (Electronic Control Module; behind fan shroud)
- 2009 Chevrolet Traverse (Electronic Control Module; behind fan shroud)
- 2009 Buick Enclave (Electronic Control Module; behind fan shroud)
- 2009 Saturn Outlook (Electronic Control Module; behind fan shroud)
This part is a direct replacement for part numbers: 12623325, 12628387, 12605672, 12630594, 19300016.
What does ‘programmed to your VIN’ actually mean?
It means we load the specific software file from GM that matches your car’s exact factory build, including engine, transmission, and emissions options. This ensures it works correctly right out of the box, without needing a trip to the dealer for expensive programming.
Will I need to perform any other procedures after installation?
In most cases, you will need to perform a simple idle relearn procedure by letting the engine idle for several minutes. Some vehicles may also require a security relearn, which typically involves cycling the key and can be done without special tools. We include simple instructions for these common procedures.
Where is the ECM on my 2008 CTS?
On the 2008-2009 Cadillac CTS, the ECM is located in the engine bay, on the passenger side, near the firewall. On the GM SUV models like the Acadia or Traverse, it is typically mounted behind the radiator fan shroud.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for it to function.
Is this a brand new part?
This is a high-quality, fully tested, and guaranteed functional replacement part. Each module undergoes a rigorous inspection and programming process with the latest GM software to ensure it meets or exceeds original performance standards, providing a reliable and cost-effective solution.