Is Your Buick Regal Running Rough? The ECM Might Be the Culprit.
If your 2011 Buick Regal is experiencing perplexing issues like a persistent check engine light, erratic engine behavior, stalling, or a complete failure to start, the problem may lie with its electronic brain: the Engine Control Module (ECM). The ECM is the central command center for your vehicle’s engine, managing everything from fuel injection and ignition timing to emissions control and transmission shifting. When it fails, the symptoms can be widespread and frustrating, often mimicking other component failures.
Don’t let a faulty computer keep your car off the road. This Engine Control Module, part number 12642665, is the direct-fit, reliable solution you need. We take the guesswork and expensive dealership visits out of the equation by programming the module specifically for your vehicle using your VIN before it ever leaves our facility. This ensures that when it arrives, it’s ready for a straightforward installation, restoring your vehicle’s performance, fuel efficiency, and reliability.
From the Diagnostic Bay
We once had a 2011 Buick LaCrosse (which uses a similar ECM) come into the shop with a no-start condition. The owner had already replaced the battery, alternator, and starter based on advice from forums and a parts store. The car would crank but never fire up. After hooking up our diagnostic scanner, we saw no communication with the ECM. We checked the power and ground feeds to the module, which were all good. This pointed directly to an internal failure of the ECM itself. We installed a VIN-programmed module, performed a quick security relearn, and the car fired up on the first try. It’s a classic case of how a single electronic component can sideline an otherwise healthy vehicle, and why accurate diagnosis is key.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling or stumbling for no apparent reason.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling or misfires.
- ✔ Difficulty starting or a complete no-start condition.
- ✔ Poor acceleration and overall engine performance.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Inconsistent or incorrect automatic transmission shifting.
Why Our 2011 Regal Engine Module is the Ideal Solution
Replacing an ECM isn’t just about swapping parts. A new module is essentially a blank slate and requires specific programming to communicate with your vehicle’s unique components and security system. Our process eliminates this complex step for you. By providing your Vehicle Identification Number (VIN) at checkout, you receive a module that is loaded with the latest GM-certified software for your exact 2011 Regal. This plug-and-play approach saves you from costly towing fees and expensive programming charges at a dealership or specialized shop. This part is a direct replacement for multiple part numbers, including 12616889, 12630908, 12637106, 12650256, and 12651993, ensuring broad compatibility across a range of GM vehicles.
Installation Process
While professional installation is always recommended, replacing the ECM is manageable for the experienced DIY mechanic. The module is typically located in the left-hand (driver’s side) engine compartment. The basic steps involve disconnecting the vehicle’s battery, carefully unplugging the electrical connectors from the old module, unbolting it from its bracket, and then installing the new module in the reverse order. After installation, a ‘security relearn’ or ‘case relearn’ procedure may be required, which can often be done without special tools. Instructions for this procedure are widely available online for your specific model.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. We handle all the programming for you before shipping. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the correct software for your specific car. It will arrive ready to install.
Where is the ECM located on my 2011 Buick Regal?
On the 2011 Buick Regal, the Engine Control Module is located in the engine compartment on the left-hand (driver’s) side.
Will I need to do anything else after installing the module?
In many cases, a simple security relearn procedure is required for the vehicle to recognize the new module. This procedure, often called a “key-on, key-off” cycle, can typically be performed by the owner and does not require a special scan tool. We recommend searching for the specific procedure for your vehicle.
How do I send you my VIN?
You can add your VIN to the notes section during the checkout process. If you forget, don’t worry! We will contact you via email after your purchase to request the necessary information.
My old module has a different part number. Will this still work?
Yes, this module is a direct replacement for several part numbers, including 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993. As long as your original part number is on this list, this module will fit and function correctly in your vehicle once programmed.