Restore Peak Performance to Your Buick LaCrosse
Is your 2013-2016 Buick LaCrosse suffering from perplexing engine issues, a persistent check engine light, or a no-start condition? The Engine Control Module (ECM), the central computer of your vehicle’s powertrain, is often the culprit. It meticulously manages everything from fuel injection and spark timing to transmission shifts and emissions control. When it fails, the symptoms can be widespread and frustrating. This genuine GM ECM, part number 12644446, is the definitive solution to restore your vehicle’s original performance and reliability.
The Plug-and-Play Solution for Your 2013-2016 LaCrosse ECM
Forget expensive dealership visits and complex programming procedures. We take the guesswork out of the repair. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will flash this module with the latest, most stable GM-certified software specific to your LaCrosse. This ensures that when the part arrives, it’s a direct-fit, plug-and-play replacement. It will seamlessly integrate with your car’s existing systems, including the ignition and anti-theft security, often requiring only a simple key relearn procedure you can do at home.
From the Diagnostic Bay
We recently had a 2014 LaCrosse come in with a complaint of intermittent stalling and a check engine light for a random misfire. The owner had already replaced the spark plugs and an ignition coil at another shop with no success. After hooking up our professional scan tool, we noticed the fuel trim data was erratic and the processor response time was slow. Instead of just throwing more parts at it, we tested the ECM’s power and ground circuits, which were solid. This pointed directly to an internal failure of the original module. We installed one of our VIN-programmed ECMs, performed the security relearn, and the car ran perfectly. The customer was thrilled to have a final, correct fix that saved them from more costly and unnecessary repairs.
Common Symptoms of a Failing ECM
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ No-start or hard-start conditions
- ✔ Noticeable decrease in fuel economy
- ✔ Rough or erratic engine idle
- ✔ Hesitation or stumbling during acceleration
- ✔ Unexplained transmission shifting problems
- ✔ Communication errors with diagnostic scan tools
Guaranteed Compatibility and Quality
This ECM is a genuine, road-tested component sourced from a salvaged vehicle, ensuring OEM quality and durability. It is a direct replacement for several part numbers, including 12653998, 12633555, 12655007, and 12644446. We have provided a comprehensive fitment list below to ensure this part is correct for your vehicle. Please verify your model and options before ordering.
Verified Vehicle Fitment:
This module is compatible with a wide range of GM vehicles. While this listing is focused on the LaCrosse, it also fits the following models (please verify your specific engine and options):
- Acadia: 2013-2016
- ATS: 2013-2015
- Camaro: 2013-2015 (3.6L)
- Caprice: 2014-2016 (3.6L)
- Captiva Sport: 2013-2015
- CTS: 2014-2015 (Sdn, 2.0L)
- Enclave: 2013-2016
- Equinox: 2013-2016
- Impala: 2014-2017
- LaCrosse: 2013-2016
- Malibu: 2013-2016
- Orlando: 2014
- Regal: 2013-2016
- SRX: 2013-2016
- Terrain: 2013-2016
- Traverse: 2013-2016
- Verano: 2013-2016
- XTS: 2013-2016 (3.6L)
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming involves loading your vehicle’s specific software and calibration files onto the ECM. This ensures the module communicates correctly with your car’s engine, transmission, anti-theft system, and other electronics. Without it, the vehicle will not start or run properly.
How do I provide you with my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. You can typically add it as a note during checkout or reply to your order confirmation email. We cannot ship the part until we receive your VIN.
Is this a new part?
No, this is a high-quality, used OEM part that has been carefully inspected, tested, and sourced from a salvaged vehicle. This allows us to provide a reliable, factory-correct part at a significant saving compared to a new unit from a dealership.
Will I need to do anything after installation?
Because this ECM comes pre-programmed to your VIN, it is designed to be a plug-and-play installation. However, on most GM vehicles, you may need to perform a simple security relearn procedure, also known as a ‘key relearn’. This process typically takes 10-30 minutes and does not require any special tools. We can provide instructions for this procedure upon request.
How can I be sure this part will fix my car?
While the symptoms listed are very common for a failing ECM, it’s crucial to have your vehicle properly diagnosed by a qualified technician. This ensures you are replacing the correct part and avoids unnecessary expenses. We guarantee the functionality of the module itself but cannot guarantee it will solve a specific problem without a proper diagnosis.