Is Your Truck Running Rough? Get a Reliable, Programmed Solution.
As a technician with over two decades of experience, I’ve seen firsthand the frustration a failing Engine Control Module (ECM) can cause. Your 2014-2016 Silverado 1500 might be stalling, shifting erratically, or showing a persistent Check Engine Light. These aren’t just annoyances; they’re signs that the very brain of your engine is in trouble. The ECM controls everything from fuel mixture and ignition timing to transmission shifting and emissions. When it fails, your truck’s performance and reliability suffer.
This isn’t just a replacement part; it’s a complete solution. We offer a genuine GM Engine Control Module, part number 12663391, that arrives at your doorstep fully programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures perfect communication between the module and your vehicle’s systems, just like the original. By handling the programming before we ship, we save you a costly trip to the dealership and eliminate the need for expensive proprietary scan tools. You get the latest GM software updates for optimal performance and efficiency, restoring your truck to its factory-spec operation.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2015 Sierra that came into the shop with the most baffling set of symptoms. The owner complained of random stalling at red lights and occasional hard shifting, but there were no consistent trouble codes—just a generic U0100 (Lost Communication) code that would pop up and disappear. We checked wiring harnesses and connectors for days. Finally, we decided to monitor the ECM’s live data stream. We noticed the processor would momentarily hang, causing the hiccups. We installed a new, pre-programmed 2014-2016 Silverado 1500 ECM. The ghost was gone. It’s a powerful reminder that with modern vehicles, having the correct, VIN-matched software is just as important as the hardware itself.
Is Your Silverado Showing These Signs of ECM Failure?
A faulty ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution. Look out for these common indicators:
- ✔ Check Engine Light is illuminated
- ✔ Engine stalling or misfiring
- ✔ Poor or inconsistent fuel economy
- ✔ Transmission shifting issues (harsh or delayed shifts)
- ✔ Vehicle won’t start, or has trouble starting
- ✔ Communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100
Straightforward Swap: Your ECM Installation Guide
Installing your new ECM is a manageable job for a confident DIYer. Since we’ve handled the programming, you just need to perform the physical swap and a simple security relearn procedure. Here’s a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to ensure all systems are powered down.
- Locate the ECM: On most 2014-2016 Silverado/Sierra 1500 models, the ECM is located in the left-hand (driver’s side) front of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely tighten the bolts. Reconnect the electrical connectors, ensuring they click firmly into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure to sync the new ECM with your truck’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating a few times. Instructions will be included.
Verified Compatibility Across the GM Lineup
While this is a direct-fit solution for the 2014-2016 Silverado 1500, this versatile module is also compatible with a wide range of other GM vehicles and supersedes multiple part numbers, including 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12672963, and 12669318. Please verify your vehicle from the list below:
- ATS: 2014-2016
- CAMARO: 2016 (6.2L)
- CANYON / COLORADO: 2015-2016 (3.6L)
- CORVETTE: 2014-2016
- CTS: 2014-2016 (3.6L, 6.2L)
- ESCALADE / ESCALADE ESV: 2015-2016
- SIERRA 1500 / SIERRA DENALI 1500: 2014-2016
- SILVERADO 1500 PICKUP: 2014-2016
- SUBURBAN 1500: 2015-2016
- TAHOE: 2015-2016
- XTS: 2014-2016 (3.6L)
- YUKON / YUKON XL 1500: 2015-2016
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential for us to load the exact, correct GM factory software for your truck’s specific options, engine, and transmission. This ensures seamless integration and prevents compatibility issues.
Is this a simple plug-and-play installation?
Because we pre-program the module, it’s very close. You install the hardware and then perform a simple security relearn procedure that does not require any special tools. We provide instructions for this process.
Will this fix my check engine light?
If the check engine light and other symptoms are caused by a faulty ECM, then yes, this part will resolve those issues. It’s crucial to have a proper diagnosis to confirm the ECM is the point of failure before ordering.
Do I need to send my old ECM back?
This listing does not require a core return. You can keep or responsibly dispose of your old module.
What if I have the wrong part number?
This module, 12663391, replaces many different GM part numbers. As long as your vehicle is on our compatibility list and you provide the correct VIN, we will ensure the software is a perfect match for your application.