Restore Your Vehicle’s Brain and Get Back on the Road
Is your Buick, Cadillac, or Chevy plagued by a persistent check engine light, erratic behavior, or worse, a no-start condition? A failing Engine Control Module (ECM) can be the frustrating culprit, leaving your vehicle unreliable and parked. This isn’t just an inconvenience; it’s a disruption to your life. We offer the definitive, hassle-free solution: a professionally programmed Engine Control Module that restores your vehicle’s performance and your peace of mind. This unit arrives at your door flashed with the latest GM software and perfectly matched to your vehicle’s specific VIN, eliminating the need for an expensive trip to the dealership.
Common Symptoms of a Failing ECM & Your Solution
If you’re experiencing any of the following issues, a faulty engine computer is a likely cause. This part is designed to be the direct solution for these problems:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U-series communication errors
- Engine stalling or misfiring unexpectedly
- Poor fuel economy and reduced engine power
- Harsh or erratic automatic transmission shifting
- Complete no-start or intermittent starting problems
By replacing your old unit with this pre-flashed module, you are installing a reliable, updated component designed to resolve these core issues. Our expert programming ensures that this Programmed 12678512 ECM integrates seamlessly with your vehicle’s existing systems.
Features & Benefits
- ✔ Plug & Play Installation: Because we program the module to your VIN before shipping, you can skip the expensive dealership programming. In most cases, it’s a straightforward installation.
- ✔ Latest GM Software Updates: Your ECM will be loaded with the newest factory software, ensuring optimal fuel efficiency, emissions control, and engine performance.
- ✔ VIN-Matched for Precision: We tailor the programming to your exact vehicle, accounting for all factory options from the transmission to the emissions package for a perfect match.
- ✔ Cost-Effective Repair: Avoid the high labor costs and programming fees associated with dealership service departments. This is the smart, direct-to-you solution.
- ✔ Broad GM Compatibility: This module is a direct replacement for a wide range of popular GM vehicles, including the Cadillac STS, Chevy Colorado, Hummer H3, and Buick Lucerne. See the full fitment list for details.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
In modern vehicles, the ECM is more than just an engine controller; it’s the central hub of a complex network. It communicates with the transmission, anti-lock brakes, and crucially, the anti-theft system (like GM’s VATS or Passlock). Simply installing a generic, un-programmed module from a salvage yard will result in a no-start condition because the security systems won’t recognize it. Our VIN-programming service handles this critical step for you. We ensure the Programmed 12678512 ECM is correctly configured to communicate with all of your vehicle’s modules, making the installation process as smooth as possible.
Stop guessing and start driving. This is the reliable, professional-grade solution to get your vehicle running like it should. By providing us with your VIN at checkout, you ensure that the Programmed 12678512 ECM you receive is the correct one for the job, ready to restore your vehicle’s dependability from the moment it’s installed.
Frequently Asked Questions
Do I need to do any additional programming after I receive this part?
No. This ECM is shipped to you fully programmed to the VIN you provide. It is ready for installation right out of the box. In some cases, a simple, tool-free security relearn procedure may be necessary, which typically involves cycling the key in the ignition.
How do I provide you with my vehicle’s VIN?
You can enter your 17-digit Vehicle Identification Number (VIN) during the checkout process. Please double-check it for accuracy, as this is essential for correct programming.
My original ECM has a different service number. Will this part still work?
Yes. This module is a direct replacement for multiple service numbers, including 12636659, 12639300, 12628993, and others listed in the description. As long as your vehicle is on the compatibility list, this part will function correctly.
What is a security relearn, and is it difficult?
A security relearn is a simple procedure that syncs the new ECM with your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this two or three times. No special tools are required, and instructions are readily available online for your specific model.
What kind of warranty is included?
This unit is backed by our one-year replacement warranty, giving you confidence in your repair.