Is Your Vehicle Running Rough, Stalling, or Throwing Confusing Codes?
There’s nothing more frustrating than a vehicle that’s lost its reliability. One minute it’s fine, the next you’re dealing with a check engine light, poor acceleration, or a dreaded no-start condition. If your Cadillac, Chevy, GMC, or Hummer is acting up, the problem often points directly to a failing Engine Control Module (ECM). As the brain of your engine, when the ECM falters, the entire system suffers. After twenty years in the shop, I’ve seen how a faulty ECM can mimic a dozen other problems, leading to expensive and unnecessary repairs.
The Direct, Dealer-Free Solution for Your Engine Problems
This isn’t just a replacement part; it’s a complete solution. We are providing a genuine GM Engine Control Module, part number 12628911, that comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means we load the latest, most stable software from General Motors before it ever leaves our facility. The result is a true plug-and-play component that restores your vehicle’s original performance and efficiency without a costly trip to the dealership for programming.
A Technician’s Real-World Experience
“A customer’s 2009 Trailblazer SS came in last month on a tow truck. It would crank but never start. The owner had already replaced the fuel pump and crank sensor based on forum advice. After hooking up my scan tool, I noticed a complete loss of communication with the ECM. We checked the powers and grounds to the moduleโthey were perfect. The culprit was an internal failure in the original ECM, a common issue I’ve seen on these platforms due to years of heat cycles in the engine bay. We installed one of our VIN-programmed modules, and the truck fired up on the first try. It saved the customer hundreds in diagnostic time and unnecessary parts.”
Is Your ECM Failing? Watch for These Symptoms:
- โ Persistent Check Engine Light (CEL)
- โ Engine stalling or shutting off while driving
- โ Poor or erratic engine performance and acceleration
- โ Decreased fuel economy
- โ Vehicle won’t start, but the battery and starter are good
- โ Communication errors with diagnostic scan tools
- โ Harsh or incorrect automatic transmission shifting
Simple Installation: Get Back on the Road Fast
Installing your pre-programmed 2009 XLR Engine Control Module is a straightforward process you can do at home. For the XLR, the ECM is located in the right-hand front of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: Find the module in the engine bay. It will have several large electrical connectors attached.
- Disconnect: Carefully release the locking tabs and unplug the wiring harnesses from the old ECM.
- Swap the Module: Unbolt and remove the old ECM. Mount the new module securely in its place.
- Reconnect: Plug the wiring harnesses firmly into the new ECM until they click into place.
- Final Step: Reconnect the negative battery terminal. The vehicle is now ready to start.
Expert Pro Tip: Connector Inspection
Before plugging in your new ECM, take 30 seconds to shine a flashlight into the vehicle’s wiring harness connectors. Look for any signs of green or white corrosion, or any pins that look bent or pushed back. A poor connection is a primary cause of repeat module failure. If you see any corrosion, clean it carefully with a specialized electronics cleaner and a small brush.
Guaranteed Compatibility and Interchangeability
This module is a direct replacement for several GM service numbers, ensuring a perfect fit and function. If your original module has any of the following part numbers, this is the correct replacement for you:
Interchangeable Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
This part is confirmed to fit a wide array of vehicles, including but not limited to:
- Cadillac CTS, DTS, SRX, STS, XLR
- Chevrolet Colorado, Corvette, Trailblazer
- GMC Canyon, Envoy
- Hummer H3
- Buick Lucerne
- Saab 9-7X
Important: Upon purchase, please provide your vehicle’s 17-digit VIN to ensure we program the module correctly for your specific application and options. This step is critical for a successful repair.