Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
The Engine Control Module (ECM), often called the powertrain control module (PCM), is the electronic brain of your vehicle. It manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of frustrating and seemingly unrelated problems. If you’re experiencing erratic engine behavior, poor fuel economy, or a no-start condition in your 2016 Suburban 3500 or other compatible GM vehicle, a faulty ECM is a likely culprit.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and expensive dealership visits out of the equation. This genuine GM ECM, part number 12670335, is professionally programmed with the latest official GM software updates specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures that once you receive it, the module is ready for a straightforward installation, restoring your vehicle’s original performance, efficiency, and reliability.
From the Diagnostic Bay
We had a 2014 Chevy Cruze come in that had its owner completely stumped. The car would intermittently stall at red lights and had a persistent P0171 (System Too Lean) code that wouldn’t clear, even after replacing the mass airflow sensor and O2 sensors. The owner had spent hundreds on parts that didn’t fix the issue. After hooking up our diagnostic scanner and monitoring the live fuel trim data, we noticed the ECM was commanding erratic fuel adjustments that didn’t match sensor inputs. We installed a VIN-programmed ECM, and the problem vanished instantly. The fuel trims stabilized, the code cleared, and the car ran perfectly. It’s a classic case where the root cause was the computer itself, not the parts it was controlling.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various trouble codes
- ✔ Engine stalling or misfiring unexpectedly
- ✔ Noticeable decrease in fuel economy
- ✔ Vehicle refuses to start or has difficulty starting
- ✔ Poor engine performance, hesitation, or rough idling
- ✔ Automatic transmission shifting problems
- ✔ Communication issues with diagnostic scan tools
The Importance of a Programmed 2016 Suburban 3500 Engine Module
Modern vehicles are complex systems. The ECM needs to know the specific parameters of your vehicle—engine size, transmission type, emissions equipment, and even tire size—to function correctly. Simply installing a used or non-programmed module from another vehicle will not work and can even cause further damage. Our process ensures this 2016 Suburban 3500 Engine Module is a perfect match. By providing your VIN at checkout, you receive a unit that is fully updated and calibrated, making the installation process as simple as possible. This is the most reliable way to restore your vehicle’s factory settings and clear persistent electronic issues.
This Module is a Direct Replacement for the Following Part Numbers:
12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200
Extensive Vehicle Compatibility:
While this is a perfect fit for the 2016 Suburban 3500 Engine Module, it also fits a wide array of other GM cars, trucks, and vans. Please verify your part number and check the comprehensive fitment list below to ensure compatibility with your specific model and year.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. This ECM comes fully pre-programmed to your vehicle’s specific VIN with the latest GM software updates. It is designed to be a plug-and-play solution, though some vehicles may require a simple security relearn procedure which can be done without any special tools.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your exact vehicle.
How do I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard (visible through the windshield) and the driver’s side door jamb sticker.
What if my original part number is not 12670335?
This module replaces several different part numbers. Please check the list of compatible part numbers provided in the description (e.g., 12668866, 12668994, etc.). If your part number is on that list, this module will work for your vehicle.
Is any additional setup required after installation?
In most cases, no. However, some GM vehicles require a security or anti-theft relearn procedure after the ECM is replaced. This is a simple process that typically involves turning the key on and off in a specific sequence. Instructions are readily available online for your specific model.