Restore Your Cadillac’s Performance and Reliability
Is your 2010-2011 Cadillac STS, or another GM 3.6L vehicle, suffering from frustrating issues like stalling, no-start conditions, or an illuminated Check Engine Light? A failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine, a faulty ECM can cause a cascade of problems, from poor fuel economy to complete engine shutdown. This replacement ECM is the definitive solution, arriving at your door pre-programmed with the latest GM software updates specifically for your vehicle. Simply provide your VIN at checkout, and we handle the complex programming for you, saving you a costly trip to the dealership.
From the Diagnostic Bay
I remember a 2011 GMC Acadia that came into the shop with a complaint of intermittent stalling at stoplights. The owner had already replaced the spark plugs and a camshaft sensor with no luck. There were no hard codes, just a history code for P0606 (ECM Processor Fault). After verifying power and ground to the module, we knew the internal processor was failing intermittently. We installed one of these pre-programmed ECMs, matched to the customer’s VIN. The vehicle started immediately, and after a 20-mile test drive, the stalling issue was completely gone. It’s a classic failure mode for these units, and this direct-fit, programmed module is the most efficient fix.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need. In my 20+ years of experience, these are the most common indicators I’ve seen in the shop.
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Communication issues with diagnostic scan tools.
- ✔ Harsh or erratic transmission shifting.
A Straightforward Guide to Your 2010-2011 STS ECM Installation
Replacing the ECM on these vehicles is a manageable task for a confident DIYer. The key is our pre-programming service, which eliminates the need for expensive dealer tools. Follow these general steps for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2010-2011 Cadillac STS, the ECM is typically found in the engine compartment on the right-hand (passenger) side. For other models, refer to the fitment list for common locations.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old ECM. Avoid forcing them.
- Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
- Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect and Secure: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘ON’ position (without starting) for 10-15 seconds, then turn it off. Repeat this once more. This allows the other vehicle modules to recognize the new ECM. Start the engine and check for proper operation.
Important Note for Camaro & LaCrosse Owners: For these specific models, an additional step is required to ensure seamless, plug-and-play functionality. Due to the immobilizer system, we will need you to send us your original ECM. We will read the security data from your old module and transfer it to your new one. We will contact you with instructions after your purchase.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 19300015, 19300014, 12617230, 12636355, and 12635019. It is guaranteed to fit the following vehicles equipped with the 3.6L engine:
- ✔ 2010-2011 Cadillac STS (RH engine)
- ✔ 2010-2011 Cadillac CTS (RH front engine compartment)
- ✔ 2010-2011 Chevrolet Camaro (3.6L)
- ✔ 2010-2011 Chevrolet Traverse (behind fan shroud)
- ✔ 2010-2011 Buick LaCrosse (LH engine compartment)
- ✔ 2010 Buick Allure (LH engine compartment)
- ✔ 2010-2011 Buick Enclave (behind fan shroud)
- ✔ 2010-2011 GMC Acadia (behind fan shroud)
- ✔ 2010 Saturn Outlook (behind fan shroud)
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the latest official GM software for your specific vehicle. We program the ECM with this data, ensuring it correctly manages your engine, transmission, and emissions systems, just like a new module from the factory.
Is any additional programming required after I install it?
For most vehicles listed, no. The module arrives ready to install. For the 2010-2011 Camaro and LaCrosse, we require your old module to transfer immobilizer data, which makes the new one fully plug-and-play once you receive it.
What if my part number isn’t an exact match to 12636355?
This module is a direct replacement for several part numbers, including 19300015, 19300014, 12617230, and 12635019. As long as your vehicle and original part number are on our compatibility list, it will work perfectly.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal ECM failure (common codes P0601-P0606), then yes, this will resolve the issue. However, you should always ensure other potential causes (like faulty sensors or wiring) have been ruled out.
Do I need to send my old ECM back?
A core return is not required unless you own a Camaro or LaCrosse. For those models, we need your original unit to perform the immobilizer data transfer service. We will provide shipping instructions after your purchase.