Restore Peak Performance to Your GM Truck
When the brain of your truck’s engine—the Engine Control Module (ECM)—starts to fail, it can cause a cascade of frustrating problems. From a check engine light that won’t go away to poor fuel economy, rough idling, or even a no-start condition, a faulty ECM can bring your 2012-2016 Silverado 3500 to a grinding halt. As a technician with over two decades of experience, I’ve seen how a failing module can mimic a dozen other issues, leading to wasted time and money on incorrect diagnoses. This isn’t just another part; it’s a direct-fit, reliable solution designed to get your workhorse back on the job.
The biggest hurdle with ECM replacement has always been the programming. Historically, you’d have to install the part and then have your truck towed to a dealership for expensive flashing. We eliminate that step entirely. By providing us with your vehicle’s VIN at checkout, we program this module with the very latest GM-certified software specifically for your truck. It arrives at your door ready for installation, turning a complex, multi-day repair into a straightforward job you can do in your own garage.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2014 Sierra 2500 (which uses this exact ECM) come into the shop with an intermittent no-start condition that was driving the owner crazy. Two other shops had already replaced the battery and starter to no avail. The truck would be fine for days, then suddenly refuse to crank. There were no consistent trouble codes, just a ghost in the machine. After running a full diagnostic sweep during one of its ‘bad’ moments, I saw a network communication code (U0100) flash for just a second before disappearing. This pointed me to the ECM. The internal processor was failing under specific temperature conditions, cutting communication. We installed one of these pre-programmed modules, and the problem was solved for good. It’s a classic example of how a failing ECM can be the hidden root of very confusing symptoms.
Is Your Silverado Showing These Signs of ECM Failure?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or U0100 (Lost Communication With ECM/PCM).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drop in fuel mileage.
- ✔ Rough or inconsistent engine idle.
- ✔ Vehicle stalling unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of power and sluggish acceleration.
A Straightforward Guide to Installation
One of the key benefits of this module is its simple, plug-and-play installation. No special programming tools are required.
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the ECM: On your 2012-2016 Silverado 3500, the ECM is located in the front of the engine compartment on the driver’s side, near the air filter housing.
- Disconnect the Old Module: Carefully unplug the electrical connectors. There are typically release tabs that need to be pressed or slid to unlock them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place.
- Reconnect Everything: Securely plug the electrical connectors into the new module. You should hear a ‘click’ as they lock. Reconnect the negative battery terminal.
- Final Step: Start your engine. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes before starting. Your truck is now ready to drive!
Verified Vehicle Compatibility
This ECM is a direct replacement for part number 12692200 and is also fully interchangeable with part numbers 12668866, 12668994, 12643636, 12663405, 12670335, and 22819494. While this listing is focused on the 2012-2016 Silverado 3500 ECM, this versatile module fits a wide range of GM vehicles, including:
- ✔ Chevrolet Silverado 2500/3500 (2012-2016) w/ 6.0L
- ✔ GMC Sierra 2500/3500 & Denali (2012-2016) w/ 6.0L
- ✔ Chevrolet Express 2500/3500 Van (2016) w/ 4.8L or 6.0L
- ✔ GMC Savana 2500/3500 Van (2016) w/ 4.8L or 6.0L
- ✔ Chevrolet Suburban 3500 (2016)
- ✔ Chevrolet Cruze (2012-2016)
- ✔ Chevrolet Sonic (2012-2016)
- ✔ Chevrolet Trax (2013-2016)
- ✔ Chevrolet Volt (2011-2015)
- ✔ Buick Encore (2013-2016)
- ✔ Cadillac ELR (2014-2016)
- ✔ Chevrolet Spark (2014-2015)
Do I need to do any programming after I install this ECM?
Do I need to do any programming after I install this ECM?
No. This module arrives fully programmed to your vehicle’s specific VIN. The only procedure you may need to perform is a security relearn, which is an automated process that typically involves leaving the key in the ‘ON’ position for 10-15 minutes before the first start. No special tools or trips to the dealer are necessary.
What information do you need from me?
After you complete your purchase, we require your 17-digit Vehicle Identification Number (VIN). This allows us to load the correct, most up-to-date GM software for your truck’s specific configuration, ensuring perfect compatibility.
Will this fix my check engine light?
If the check engine light is on due to an internal ECM failure (like codes P0601 or P0606), then yes, this part will resolve the issue. However, if the light is on for another reason (e.g., a faulty oxygen sensor), that separate issue will still need to be addressed.
Is this a brand new part?
This is a high-quality, tested OEM part that has been professionally inspected and prepared for service. Each unit is verified to be fully functional before being programmed and shipped, offering a reliable and cost-effective alternative to a much more expensive new part from a dealership.
My original ECM has a different part number. Will this work?
Yes. This ECM, part number 12692200, is the designated service replacement for several earlier part numbers, including 12668866, 12668994, and 12643636, among others. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.