Is your 2010-2011 Cadillac CTS, or another GM 3.6L vehicle, suffering from perplexing engine issues? A faulty Engine Control Module (ECM) is often the culprit behind problems that can sideline your car and lead to frustrating, expensive diagnostic sessions. The ECM is the central computer of your engine, responsible for managing everything from fuel injection and ignition timing to emissions controls and communication with other vehicle modules. When it fails, the entire system can be compromised. This replacement ECM, part number 12636355, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2011 Buick Enclave come in with a persistent P0641 code (Sensor Reference Voltage ‘A’ Circuit/Open) and a host of other seemingly unrelated sensor codes. The owner had already replaced the throttle body and two O2 sensors with no luck. The engine would intermittently stall and run rough. Instead of continuing to chase individual sensors, we hooked up a scope to the 5-volt reference line coming from the ECM. We found the voltage was erratic and would drop out completely, causing the sensors to report false data. The root cause wasn’t the sensors themselves, but the failing power supply inside the original ECM. Installing a correctly programmed replacement like this one resolved all the codes and restored the Enclave’s smooth operation instantly. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing GM 3.6L ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A sudden, unexplained drop in fuel economy.
- ✔ No-start or hard-starting conditions, especially when the engine is warm.
- ✔ Erratic automatic transmission shifting or gear hunting.
- ✔ Loss of communication with the diagnostic scan tool.
- ✔ Multiple, unrelated sensor error codes being stored in memory.
- ✔ Noticeable loss of engine power and poor acceleration.
The Solution: A VIN-Programmed 2010-2011 CTS ECM
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership. This ECM is a direct-fit replacement that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the module has the correct software and calibrations for your exact make, model, and options. We load the latest software updates from GM, which can often resolve factory-known issues and improve overall vehicle performance and longevity. This process makes installation straightforward for you or your mechanic.
This module is a direct replacement for a wide range of popular GM vehicles equipped with the 3.6L V6 engine. It is compatible with the following original equipment part numbers: 19300015, 19300014, 12617230, 12636355, and 12635019. By providing your VIN upon purchase, you guarantee that you receive a module that is perfectly matched to your vehicle’s factory specifications.
Vehicle Fitment:
This ECM is confirmed to fit the following vehicles with the 3.6L engine:
- 2010-2011 Cadillac CTS
- 2010-2011 Cadillac STS
- 2010-2011 Buick LaCrosse
- 2010 Buick Allure
- 2010-2011 Chevrolet Traverse
- 2010-2011 Chevrolet Camaro
- 2010 Saturn Outlook
- 2010-2011 Buick Enclave
- 2010-2011 GMC Acadia
Special Note for Camaro & LaCrosse Owners: For these specific models, the vehicle’s anti-theft (immobilizer) system is deeply integrated with the original ECM. To ensure a true plug-and-play installation without requiring additional security relearn procedures, we will need you to send us your original ECM. We will professionally extract the immobilizer data and transfer it to your new module. This service is included and we will contact you with instructions after your purchase.
Frequently Asked Questions
Do I need to do any programming after I receive this part?
No. We program the module to your vehicle’s VIN before shipping it to you. For most models, it is a direct installation. For Camaro and Lacrosse models, we handle the immobilizer data transfer to ensure a plug-and-play experience.
How do I provide my VIN?
You can enter your 17-digit VIN during the checkout process or reply to your order confirmation email with the information. Your VIN can be found on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What happens if I install this without it being programmed?
An unprogrammed ECM will not work correctly. The vehicle will likely not start due to the anti-theft system, and it will not have the correct software for your engine and transmission, leading to poor performance and potential damage. Our pre-programming service eliminates these issues.
Is this compatible with other part numbers?
Yes, this ECM is a direct replacement for several part numbers, including 19300015, 19300014, 12617230, and 12635019. As long as your vehicle is on the fitment list, this module will work.
Why do you need my old module for a Camaro or LaCrosse?
The Camaro and LaCrosse have a specific anti-theft system where security data is stored in the original ECM. To avoid complex and costly security relearn procedures at a dealership, we transfer this critical data from your old module to the new one, making it a simple plug-in installation for you.