Is Your Truck’s Brain on the Fritz? Restore Peak Performance.
The Engine Control Module (ECM), often called the engine computer, is the central command center for your 2014-2016 GMC Sierra 1500. It manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can cause a cascade of confusing and frustrating problems that can leave you stranded. This isn’t just an inconvenience; it’s a critical component for your truck’s reliability and performance. This replacement module is the definitive solution to get your vehicle running like new again.
From the Diagnostic Bay
We had a 2015 Sierra 1500 come in with a ghost of a problem. The owner complained of random stalling at stoplights and a check engine light that would come and go. We checked everything—fuel pressure was good, sensors were reading correctly on the scanner, and the wiring was intact. After hours of diagnostics, we connected a scope to the injector command signals from the ECM. We found that one of the driver circuits inside the module was intermittently dropping out under specific load conditions. It was a classic case of internal ECM failure that standard code readers couldn’t pinpoint. Swapping in a properly programmed ECM like this one solved the issue in minutes, saving the customer from replacing perfectly good parts.
Signs of a Failing 2014-2016 Sierra 1500 ECM
A faulty engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your ECM could be the culprit:
- ✔ Check Engine Light: An illuminated or flashing check engine light is the most common indicator.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire without a clear cause.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG can be traced back to incorrect fuel and air calculations by a failing ECM.
- ✔ Reduced Power & Performance: Your truck may feel sluggish, hesitate on acceleration, or have inconsistent power delivery.
- ✔ Transmission Shifting Issues: The ECM communicates with the transmission controller, and a fault can lead to harsh or erratic shifting.
- ✔ Communication Errors: Your mechanic’s diagnostic scanner may be unable to communicate with the ECM, pointing to an internal fault.
The Simple, Reliable Solution: Programmed & Ready to Install
Don’t let a complex part intimidate you. We’ve made this process as straightforward as possible. This is a genuine GM engine control module, part number 12662034, which is also a direct replacement for several other part numbers including 12692067, 12676230, and 12656993. The key benefit is our professional programming service. Before we ship the module, we use your truck’s Vehicle Identification Number (VIN) to flash it with the latest, most stable software updates directly from GM. This ensures that the module is a perfect match for your vehicle’s specific configuration, options, and emissions standards. It arrives at your door ready for installation, eliminating the need for an expensive trip to the dealership for programming.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. We handle the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN when you place your order, and we will flash the module with the correct GM software for your specific truck. This makes the installation process much simpler.
Will I need to do anything after installing the module?
In many cases, you may need to perform a simple security relearn procedure, also known as a Passlock or anti-theft relearn. This procedure syncs the new ECM with your vehicle’s anti-theft system and can typically be done in your driveway with just the ignition key. Instructions are widely available online and it usually takes about 30 minutes.
Where is the ECM located on my 2014-2016 Sierra 1500?
On the 2014-2016 GMC Sierra and Chevrolet Silverado 1500, the ECM is typically located in the front of the engine compartment on the driver’s side (LH side), often near the air filter housing or battery.
Is this compatible with other vehicles?
Yes. While this is a primary fit for the Sierra 1500, this ECM is also used in a wide range of other GM vehicles from 2014-2016, including the Silverado 1500, Tahoe, Suburban, Yukon, Escalade, Corvette, Camaro, and more. Please verify your original part number or consult the fitment list to ensure compatibility.
How do I provide my VIN?
You can add your VIN to the notes section during checkout or send it to us in a message after you complete your purchase. We cannot ship the part until we have your VIN to complete the programming.