Is Your Sierra Denali Running Rough or Not Starting at All?
If you’re dealing with a persistent check engine light, erratic engine performance, or a truck that simply won’t turn over, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your engine, the ECM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, the symptoms can be frustrating and widespread.
Over my 20+ years turning wrenches and diagnosing complex electrical issues, I’ve seen countless GM trucks from this era come into the shop with these exact problems. The driver often reports intermittent stalling, poor fuel economy, or a dashboard lit up with warning lights and communication error codes like U0100 (Lost Communication With ECM/PCM). These aren’t just annoyances; they’re signs that the very brain of your vehicle is compromised.
Expert Pro Tip: Check Your Grounds First!
Before you condemn your ECM, do yourself a huge favor and check the main engine and body ground connections. On these Sierra and Silverado trucks, a corroded or loose ground strap (especially the one from the engine block to the firewall or frame) can create electrical chaos that perfectly mimics a bad ECM. I’ve saved customers hundreds of dollars by spending 10 minutes cleaning a ground connection. A simple check with a multimeter for voltage drop across the ground path can confirm if it’s solid.
The Direct-Fit, Programmed Solution
This isn’t just a replacement part; it’s a complete, ready-to-install solution for your 2014-2016 Sierra Denali 1500. We take a genuine GM ECM, part number 12672537, and professionally program it to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures that all the factory settings, security information (immobilizer), and operational parameters are perfectly matched to your vehicle’s configuration.
Why is this so important? An unprogrammed module simply will not work. It won’t be able to communicate with the other modules in your truck, leading to a no-start condition. By programming it before we ship, we eliminate the need for an expensive trip to the dealership for programming, saving you time, money, and the hassle of a tow bill.
Key Benefits of This Programmed ECM:
- ✔ Restores Engine Performance: Corrects issues like rough idle, poor acceleration, and hesitation by restoring precise fuel and spark control.
- ✔ Clears Fault Codes: A healthy ECM will resolve persistent diagnostic trouble codes (DTCs) related to module failure or communication errors.
- ✔ Plug-and-Play Installation: Because it arrives programmed to your VIN, you can install it yourself. No special tools or dealer visits are required for programming.
- ✔ Latest GM Software: We flash the module with the newest, most stable software updates from General Motors, ensuring optimal performance and longevity.
- ✔ Guaranteed Compatibility: This module is a direct replacement for a wide range of original part numbers, ensuring it’s the right fit for your vehicle.
Installation and Compatibility
Installing this module is straightforward for a DIYer with basic tools. On most 2014-2016 Sierra and Silverado models, the ECM is located in the front left (driver’s side) of the engine compartment. Simply disconnect the battery, carefully release the locking tabs on the electrical connectors, unbolt the old module, and install the new one in its place. Reconnect the connectors and the battery, and you’re ready to go.
This module, service number 12672537, is the correct replacement for numerous other GM part numbers. If your old module has one of the following numbers, this is the correct part for you:
Compatible Part Numbers: 12692067, 12676230, 12656993, 12662034, 12673195, 12663391, 12672963, 12669318.
It also fits a wide variety of other GM vehicles, including the Silverado 1500, Tahoe, Suburban, Yukon, Escalade, Corvette, Camaro, CTS, ATS, XTS, Canyon, and Colorado. Please verify the fitment data to ensure it matches your specific model and engine options.
After purchase, please provide us with your 17-digit VIN to ensure we can program the module perfectly for your truck before shipping.