Restore Your Vehicle’s Brainpower and Performance
Is your Chevrolet Sonic, Cruze, or other GM vehicle acting erratically? Stalling for no reason, displaying a persistent Check Engine Light, or suffering from poor fuel economy? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. When it fails, it can cause a cascade of confusing problems. This isn’t just an inconvenience; it’s a critical failure that affects performance, safety, and emissions. This listing offers a direct, reliable solution: a professionally inspected and tested ECM, programmed with the latest GM software specifically for your vehicle’s VIN.
Case Study: The Intermittent Sonic Stall
A customer brought in a 2014 Sonic 1.4L with an issue that was driving them crazy: it would randomly stall at stoplights, but not every time. There were no consistent trouble codes, just a history of random communication errors. We checked fuel pressure, ignition components, and wiring harnesses—all were fine. After spending hours chasing ghosts, experience pointed me toward the ECM. On these models, I’ve seen internal logic failures cause intermittent shutdowns of fuel or spark commands that don’t always set a hard code. We installed a VIN-programmed ECM, and the problem vanished instantly. It’s a classic example of how a failing module can mimic a dozen other issues, making a reliable replacement the only true fix.
Is Your GM Showing These Symptoms?
- ✔ Check Engine Light is on with codes pointing to internal module failure (e.g., P0601, P0606).
- ✔ Your vehicle won’t start or stalls intermittently.
- ✔ Lost communication codes are present (e.g., U0100).
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The engine runs rough, misfires, or hesitates.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Replacing your ECM is simpler than you might think. Our VIN programming service eliminates the need for expensive dealer tools, making this a manageable job for a DIYer or any professional mechanic.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On most compatible vehicles like the Sonic or Cruze, the ECM is found in the engine compartment. Consult a vehicle-specific repair guide if you’re unsure.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical connectors, ensuring they click securely into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Relearn (If Needed): In many cases, the vehicle is ready to go. Some GM vehicles may require a simple security or idle relearn procedure, which can typically be done without a scan tool by cycling the ignition key.
Verified Vehicle Compatibility
This ECM is a direct replacement for part number 12663405 and other interchangeable numbers like 12668866, 12668994, 12643636, 12670335, 22819494, and 12692200. It fits a wide range of GM models. Please verify your vehicle is on this list:
Buick: Encore (2013-2016)
GMC: Savana 2500/3500 Van (2016), Sierra 2500/3500 (2012-2016), Sierra Denali 2500/3500 (2012-2016)
Note: Specific options or engine sizes may apply. Providing your VIN ensures we send the correctly programmed module for your exact vehicle configuration.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). You can also add it as a note during checkout. We cannot ship your part until we receive the VIN.
Is any additional programming required after installation?
No. This ECM arrives pre-programmed to your VIN with the latest GM software updates. In some cases, a simple key cycle or idle relearn procedure may be necessary, but no special tools are required.
Will this fix my car’s specific problem?
This module will resolve any issues directly caused by a faulty ECM. It’s crucial to ensure the ECM has been correctly diagnosed as the point of failure. This part will not fix problems related to other faulty sensors or wiring.
Does this module fit vehicles outside the 2012-2016 Sonic range?
Yes. As you can see from our compatibility list, this ECM is used in a wide variety of GM cars, trucks, and vans. The key is matching the part number or confirming fitment with your VIN.
What does ‘programmed’ mean?
Programming, or ‘flashing’, installs the correct operational software for your vehicle’s specific engine, transmission, and options. Without this, the car will not start or run correctly. We handle this for you so it’s ready for installation right out of the box.