Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Express, Silverado, or Cruze suffering from baffling engine issues? A faulty Engine Control Module (ECM) is often the culprit behind poor performance, erratic behavior, and frustrating no-start conditions. The ECM is the central computer of your vehicle’s engine management system, controlling everything from fuel injection and ignition timing to emissions and transmission shifting. When it fails, the entire vehicle can be compromised. This replacement Engine Control Module, part number 12668866, is the definitive solution to get your vehicle running reliably again.
From the Diagnostic Bay
We recently had a 2016 Express 3500 work van towed in that had its owner pulling his hair out. The van would randomly stall at intersections and had a persistent Check Engine Light. The owner had already replaced the throttle body and a couple of sensors based on generic code readings, but the problem persisted. After hooking up our professional scan tool, we noticed erratic data streams coming from the ECM itself. The internal processors were failing under load. We installed one of our VIN-programmed modules, performed the security relearn, and the van ran perfectly. It’s a classic case where chasing symptoms costs more time and money than addressing the root cause—a failing computer.
Is Your ECM Failing? Common Symptoms
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Loss of power and sluggish acceleration.
The Plug-and-Play Solution: Your 2016 Express 3500 ECM
Don’t waste time and money on a trip to the dealership. We simplify the repair process. This module is not just a part; it’s a complete service. When you purchase this ECM, we will flash it with the latest, most stable General Motors software updates specifically for your vehicle. All you need to do is provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during checkout or via message. This ensures that the module you receive is perfectly matched to your vehicle’s original configuration, making installation straightforward.
This module is a direct replacement for a wide variety of GM vehicles and is interchangeable with the following part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It is meticulously inspected to ensure quality and reliability, giving you peace of mind and restoring your vehicle’s factory performance.
Installation is typically straightforward for a seasoned DIYer or any professional mechanic. Once installed, some vehicles may require a simple security or anti-theft relearn procedure, which can often be done without special tools. By ordering this pre-programmed 2016 Express 3500 ECM, you are bypassing the expensive programming fees and wait times associated with a dealership repair.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. The main benefit of our service is that we program the module for you before we ship it. Simply provide your vehicle’s VIN, and it will arrive ready for installation with the latest GM software.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield. It may also be on a sticker in the driver’s side door jamb.
Will this fix my vehicle’s specific problem?
This ECM will correct issues directly caused by a faulty engine computer. While the symptoms listed are common indicators of ECM failure, it’s essential to have your vehicle properly diagnosed. This part will not fix problems related to other faulty sensors or mechanical components.
What is a security relearn procedure?
On many GM vehicles, the anti-theft system needs to recognize the new ECM. This is a simple procedure that typically involves cycling the ignition key. We can provide instructions, and it usually doesn’t require any special tools.
Is this compatible with vehicles other than the Express 3500?
Yes. This module fits a wide range of GM models, including the Chevrolet Cruze, Sonic, Trax, Volt, Silverado, and GMC Sierra, among others. Please check the detailed fitment list on this page to confirm compatibility with your exact year, make, and model.