Is Your GM Truck or Car Experiencing Engine Problems?
If your 2014-2016 Silverado, Sierra, or other compatible GM vehicle is suffering from a persistent check engine light, rough idling, stalling, or a frustrating no-start condition, the root cause is often a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel mixture and ignition timing to emissions controls and transmission shifting. When it falters, the entire vehicle’s performance and reliability are compromised.
From the Diagnostic Bay
We had a 2015 Sierra 1500 in the shop that was a real head-scratcher. The owner complained of random stalling and harsh shifting that seemed like a major transmission problem. We scanned it and got a slew of communication error codes pointing everywhere and nowhere at once. After hours of chasing wires, we checked the power and grounds to the ECM and found them to be solid. On a hunch, we swapped in a known-good, programmed ECM. Instantly, the communication errors vanished, the truck started perfectly, and the transmission shifted like new. It’s a classic case of the vehicle’s ‘brain’ failing and causing symptoms in other systems, a costly misdiagnosis for the unprepared.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine misfires, stumbles, or runs rough at idle.
- ✔ Unexplained loss of engine power and acceleration.
- ✔ A significant drop in fuel economy.
- ✔ Intermittent or complete no-start conditions where the engine cranks but won’t fire.
- ✔ Erratic automatic transmission shifting or getting stuck in gear.
- ✔ Communication error codes with other vehicle modules (TCM, BCM).
The Direct-Fit Solution: A Pre-Programmed 2014-2016 Silverado 1500 ECM
Replacing a modern ECM isn’t just a matter of swapping parts. The module must be programmed specifically to your vehicle’s Vehicle Identification Number (VIN) to function correctly. This process typically requires an expensive trip to the dealership. Our solution bypasses that hassle entirely. We offer a genuine GM Engine Control Module that is professionally programmed with the latest factory software updates before it ever ships. By providing us with your VIN during checkout, you receive a part that is ready for installation right out of the box, restoring your vehicle’s original performance and specifications.
This module, part number 12663391, is a direct replacement for a wide range of GM vehicles, ensuring seamless integration with your existing systems. It governs critical engine parameters to deliver the precise performance, fuel efficiency, and low emissions your vehicle was designed for. Don’t let a faulty computer keep you off the road. This is the most straightforward and reliable way to solve complex electronic engine issues.
Wide-Ranging Compatibility
While this is a perfect fit for the 2014-2016 Silverado 1500 ECM, it is also the correct service part for many other GM models. Please verify your part number or consult the list below. Providing your VIN is the best way to guarantee a perfect match.
Compatible Part Numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318
Fits Models Including:
- 2014-2016 Chevrolet Silverado 1500
- 2014-2016 GMC Sierra 1500 / Sierra Denali 1500
- 2014-2016 Cadillac ATS, CTS, XTS
- 2014-2016 Chevrolet Corvette
- 2015-2016 Chevrolet Colorado / GMC Canyon
- 2015-2016 Cadillac Escalade / Escalade ESV
- 2015-2016 Chevrolet Tahoe, Suburban 1500
- 2015-2016 GMC Yukon / Yukon XL 1500
- 2016 Chevrolet Camaro
Frequently Asked Questions
What is an ECM and what does it do?
The Engine Control Module (ECM) is your vehicle’s main computer. It takes data from sensors all over the engine and vehicle to control fuel injection, spark timing, variable valve timing, and emissions systems to ensure the engine runs efficiently and powerfully.
Do I need to get this programmed?
No. The main benefit of our service is that we program the module for you before shipping. Simply provide your vehicle’s VIN when you place your order, and it will arrive ready to install with the latest GM software.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Is any additional setup required after installation?
In most cases, the module is plug-and-play. However, some GM vehicles may require a security relearn procedure (also known as a Passlock or anti-theft relearn) after installation. This procedure can typically be done by the owner without special tools and instructions are widely available online.
How can I be sure this part will fit my vehicle?
The best way to ensure compatibility is to match one of the part numbers listed in the description to the number on your current ECM. Alternatively, providing us with your VIN when you order allows us to verify the exact fitment for your specific vehicle before we program and ship the part.