Is your 2016 Chevrolet Express 2500 van running rough, stalling, or displaying a persistent Check Engine Light? These are common indicators of a failing Engine Control Module (ECM), the central computer that manages your engine’s performance, fuel economy, and emissions. A faulty ECM can cripple your workhorse van, leading to frustrating downtime and costly, incorrect repairs. This direct-fit replacement ECM, part number 12670335, is the definitive solution to restore your vehicle’s factory performance and reliability.
Unlike a standard replacement part from a local store, this module arrives at your door fully programmed to your specific vehicle. We use your van’s unique Vehicle Identification Number (VIN) to load the latest, most stable software updates directly from GM. This critical step ensures seamless communication between the ECM and all other vehicle systems, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play solution designed for both professional technicians and savvy DIYers.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer could be the culprit. A failing module can often mimic other problems, so it’s crucial to recognize the signs.
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Unexplained drop in fuel mileage
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Rough or erratic idling
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication error codes, such as U0100 (Lost Communication With ECM/PCM)
The Solution: A VIN-Programmed 2016 Express 2500 ECM
Replacing the ECM on a modern vehicle is more than just a mechanical swap. Our process simplifies this complex job. By providing us with your VIN during checkout, you receive a module that is precisely calibrated for your Express 2500’s specific engine (4.8L or 6.0L), transmission, and factory options. This ensures that ignition timing, fuel delivery, and emissions controls all operate exactly as the manufacturer intended, restoring lost power and efficiency.
We had a 2016 Express 3500 work van come into the shop with a bizarre, intermittent stalling problem. The driver said it would run fine for days, then suddenly die at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a few random communication errors stored in history. We checked fuel pressure, ignition components, and wiring harnesses for hours. Finally, on a hunch, we monitored the ECM’s internal temperature data and saw it spiking just before a stall. The module was overheating internally. We replaced it with a VIN-programmed unit like this one, and the van has been running flawlessly for the client ever since. It saved them from replacing countless other perfectly good parts.
This module is a direct replacement for a wide range of GM part numbers, including 12668866, 12668994, 12643636, and more. It fits not only the Express and Savana vans but also various model years of the Silverado, Sierra, Cruze, Sonic, and other GM vehicles. Please verify the part number or consult the detailed fitment list to ensure compatibility.
Installation and Relearn Procedure
Physical installation is straightforward. The ECM on the 2016 Express van is typically located in the rear of the engine compartment on the driver’s side. After disconnecting the battery and swapping the module, you will likely need to perform a simple security relearn procedure, often called the ‘GM 10-Minute Relearn.’ This allows the new ECM to synchronize with your vehicle’s anti-theft system. This procedure does not require special tools and can be easily found online or in a service manual.
Take control of your vehicle’s health and get your van back to work. Order today and provide your VIN for a fully programmed, ready-to-install Engine Control Module.
Frequently Asked Questions
What is an ECM and what does it do?
The Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), is a powerful computer that acts as the ‘brain’ of your vehicle’s engine. It uses data from various sensors to control fuel injection, ignition timing, emissions systems, and transmission functions to ensure optimal performance and efficiency.
Do I need to get this ECM programmed?
No. This ECM comes fully pre-programmed to your vehicle’s specific VIN before it is shipped. This service is included in the purchase price and eliminates the need for expensive dealership programming, saving you time and money.
Where is the ECM located on my 2016 Express 2500?
On the 2016 Express and Savana vans, the ECM is typically located in the engine compartment, on the driver’s side, mounted near the firewall or inner fender.
What is the security relearn procedure?
After installation, your vehicle’s anti-theft system needs to recognize the new ECM. The security relearn procedure, or ‘key cycle relearn,’ is a simple process that typically involves turning the key to the ‘ON’ position for about 10 minutes, then off, and repeating two more times. This allows the systems to synchronize. Specific instructions are widely available online.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your part without it. You can typically find your VIN on the driver’s side dashboard (visible through the windshield) or on the driver’s side door jamb sticker.