Is Your Cadillac STS Running Rough, Stalling, or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems in your 2009 or 2010 Cadillac STS, a failing Engine Control Module (ECM) is often the culprit. As a technician with over 20 years of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of issues, from poor fuel mileage and hesitation to a complete no-start situation. It’s the brain of your engine, and when it’s not working correctly, nothing else will. You need a reliable solution that doesn’t involve expensive dealership programming fees and long wait times.
The Plug-and-Play Solution: Ready for Installation Out of the Box
This Engine Control Module is the definitive fix for your vehicle’s electronic woes. We take the hassle out of the repair by programming the module specifically to your car’s Vehicle Identification Number (VIN) before we ship it. This means it arrives at your door ready for a straightforward installation, loaded with the latest GM-certified software updates to ensure optimal performance and efficiency.
- ✔ VIN-Programmed for Your Vehicle: Simply provide your VIN at checkout, and we handle all the complex programming.
- ✔ No Dealer Visit Required: Save hundreds of dollars and valuable time by avoiding dealership programming.
- ✔ Restores Original Performance: Corrects issues like rough idle, poor acceleration, and false sensor codes.
- ✔ Latest GM Software: Your module comes with the most current software updates for improved drivability and fuel economy.
- ✔ Broad Compatibility: This unit directly replaces a wide range of original service numbers, ensuring a perfect match.
Expert Pro Tip: Check Your Connectors Before Replacement
On the Cadillac STS, the ECM is located on the left-hand frame rail, which exposes it to road spray and moisture. Before you condemn the module, I always recommend a thorough inspection of the harness connectors. I’ve seen cases where severe green or white corrosion on the pins caused communication errors that mimicked a failed ECM. Disconnect the battery, unplug the module, and use a good quality electronic parts cleaner and a small brush to clean both the harness-side and module-side pins. A clean, solid connection is critical for proper operation.
Why Choose Our 2009–2010 STS Engine Control Module?
We provide more than just a part; we provide a complete, reliable repair solution. We understand that vehicle downtime is costly and stressful. By pre-programming the module, we eliminate the most common hurdle for DIY and professional installers alike. You are getting a component that is tested for communication and programmed to the highest standard, ensuring it will function correctly with your vehicle’s security system (Pass-Key/VATS) and all other onboard modules right away.
Simple, Straightforward Installation Guide
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: On your 2009-2010 STS, the Engine Control Module is mounted to the left (driver’s side) frame rail in the engine bay.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and unplug them from the old module. Inspect the connectors for any signs of damage or corrosion.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- Reconnect and Secure: Plug the electrical connectors into the new module, ensuring they click into place. Reconnect your battery terminal. A security relearn procedure may be required, which is a simple process you can do in your driveway.
Guaranteed Fitment & Interchangeability
This module is a direct replacement for part number 12630464 and is also fully interchangeable with the following GM service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, and 12678512.
While this listing is for the 2009–2010 STS Engine Control Module, this versatile part also fits a wide variety of other GM vehicles, including select models of the Corvette, CTS, SRX, DTS, Lucerne, Hummer H3, Trailblazer, Envoy, Colorado, Canyon, and Saab 9-7X. Please verify your part number to ensure compatibility.