Restore Peak Performance to Your GM Vehicle
Is your 2016 Chevy Express 3500 Van suffering from perplexing engine issues like stalling, poor fuel economy, or a persistent check engine light? The Engine Control Module (ECM), the brain of your vehicle’s engine management system, is often the culprit. This direct-fit replacement ECM, part number 12670335, is the definitive solution to restore your vehicle’s reliability and performance. It arrives at your door programmed with the latest GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN).
The Critical Role of a Programmed 2016 Express 3500 ECM
The ECM is responsible for a complex symphony of calculations, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, the symptoms can be widespread and confusing. A failing module can lead to reduced power, erratic behavior, and even a no-start condition, leaving your work van or personal vehicle stranded. Simply swapping a used module from another vehicle won’t work due to the sophisticated anti-theft systems and vehicle-specific programming. Our service eliminates the guesswork and the need for expensive dealership visits. We handle the critical programming for you, ensuring a seamless integration with your van.
From the Diagnostic Bay
We had a 2016 Express 3500 work van come in that was a fleet manager’s nightmare. It would randomly stall at traffic lights and occasionally refuse to start after a delivery. The check engine light was on, but the codes were all over the place—misfire, O2 sensor, and even a transmission communication fault. The local shop had already replaced plugs, coils, and an O2 sensor with no luck. After running a full diagnostic, we noticed the ECM would intermittently lose communication with our scan tool. This pointed to an internal failure. We installed a VIN-programmed module, performed the security relearn, and the van ran perfectly. All the ghost codes vanished, and the stalling issue was completely resolved. It’s a classic case of a failing ECM causing multiple, unrelated symptoms.
Common Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns with various codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Rough or erratic automatic transmission shifting.
- ✔ Loss of power and poor overall engine performance.
- ✔ Communication errors when trying to use a diagnostic scan tool.
Plug-and-Programmed for Your Convenience
This isn’t just a part; it’s a complete solution. Before we ship your replacement 2016 Express 3500 ECM, our technicians use your vehicle’s VIN to flash the module with the correct factory software and calibrations. This ensures that the ECM recognizes your engine, transmission, and all factory-installed options. While the module is programmed for your vehicle, you may need to perform a simple security relearn procedure (often called a key relearn or anti-theft relearn) after installation. This procedure can typically be done without special tools and instructions are widely available online or in service manuals.
Wide-Ranging Compatibility
This versatile module, identified by part number 12670335, is also a direct replacement for several other GM part numbers, including 12668866, 12668994, 12643636, and more. It fits a broad range of GM vehicles beyond the Express van, such as the Chevy Cruze, Sonic, Trax, Volt, Silverado, and GMC Sierra models. Please verify the part number or consult the detailed fitment list to ensure compatibility with your specific vehicle.
Frequently Asked Questions
What is an ECM and why is it important?
The Engine Control Module (ECM) is your vehicle’s main computer. It controls the engine’s fuel delivery, spark timing, and emissions systems to ensure optimal performance, fuel economy, and reliability. A functioning ECM is essential for your vehicle to run correctly.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains specific information about your vehicle’s engine, transmission, and factory options. We use the VIN to load the exact, correct GM software onto the ECM, ensuring it works perfectly with your vehicle right out of the box.
Is this part difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery and swapping the module. However, after installation, you will likely need to perform a security relearn procedure. This syncs the new ECM with your vehicle’s anti-theft system and keys. This procedure can often be done without special tools.
Will this fix my check engine light?
If the check engine light and other symptoms are caused by a faulty ECM, this replacement part is the correct solution. It’s crucial to properly diagnose the issue first, as other failing sensors or components can also cause a check engine light.
What happens if I don’t provide my VIN?
We cannot ship the module without your VIN. The programming is a critical step that makes the part functional for your specific vehicle. We will contact you after your purchase to obtain your VIN to complete the programming process.