Restore Peak Performance to Your Workhorse Van
Is your 2016 Chevrolet Express 2500 Van suddenly stalling, shifting erratically, or showing a persistent Check Engine Light? These aren’t just annoyances; they’re signs that the brain of your engine—the Engine Control Module (ECM)—may be failing. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of frustrating, hard-to-diagnose issues. This isn’t a part you can afford to ignore. This replacement 2016 Express 2500 Engine Control Module is the reliable, straightforward solution to get your van running like new again.
The biggest hurdle with ECM replacement has always been the programming. In the past, you’d have to install the part and then pay for a costly tow to the dealership for flashing. We eliminate that step entirely. Before we ship this module, we program it with the latest GM-certified software specifically for your vehicle using the VIN you provide. This means it arrives at your door ready for installation, saving you hundreds of dollars in programming fees and diagnostic time.
Case Study: A Tricky Diagnosis
A local delivery business brought in their 2016 Express 2500. The driver reported it would randomly lose power and stall, but with no consistent error codes. After starting, it would run fine for days. We checked the fuel pump, wiring, and sensors—all tested good. After spending hours chasing ghosts, we hooked up a scope to the ECM’s power and ground circuits. We found intermittent voltage drops inside the module itself, a classic sign of internal failure. Replacing the ECM with a pre-programmed unit like this one solved the problem instantly, getting their essential work van back in service the same day.
Is Your Van Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100 (Lost Communication).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Stalling, stumbling, or rough idling for no apparent reason.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ Other warning lights (like traction control or ABS) illuminate alongside the Check Engine Light.
A Straightforward Guide to Installation
Installing your new 2016 Express 2500 Engine Control Module is a manageable job for a confident DIYer or any professional mechanic. The ECM is typically located in the engine compartment on the driver’s side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the ECM: On the Express Van, find the module mounted near the master cylinder or air filter housing.
- Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place.
- Reconnect Everything: Securely plug the wiring harnesses back into the new ECM. You should hear a ‘click’ as they lock. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In many GM vehicles, you may need to perform a simple key-cycle security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this two more times. On the fourth cycle, the vehicle should start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for several part numbers, including 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It is guaranteed to fit the following GM models and engine options:
- Chevrolet Express 2500/3500 Van (2016): 4.8L & 6.0L Engines
- GMC Savana 2500/3500 Van (2016): 4.8L & 6.0L Engines
- Chevrolet Silverado 2500/3500 (2012-2016): 6.0L Engine
- GMC Sierra 2500/3500 & Denali (2012-2016): 6.0L Engine
- Chevrolet Suburban 3500 (2016)
- Chevrolet Cruze (2012-2016): Various gasoline engines
- Chevrolet Sonic (2012-2016): 1.4L Engine
- Chevrolet Trax (2013-2016)
- Chevrolet Spark (2014-2015): Gasoline model
- Chevrolet Volt (2011-2015)
- Cadillac ELR (2014-2016)
- Buick Encore (2013-2016): 1.4L Engine
Don’t let a bad computer keep your vehicle off the road. This pre-programmed 2016 Express 2500 Engine Control Module is the fastest, most reliable way to solve complex engine management problems and restore your vehicle’s dependability.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information.
Is any other programming required after installation?
No. This module is programmed with the latest GM software for your specific VIN. In some cases, a simple 30-minute key-cycle security relearn procedure may be necessary, which requires no special tools.
Will this fix my specific problem?
This module will correct issues directly caused by a failing ECM. It is essential to properly diagnose your vehicle’s problem first. If your vehicle has other underlying issues (e.g., bad wiring, faulty sensors), this part will not fix them.
Is this a brand new part?
This is a high-quality, tested, and guaranteed functional used OEM part that has been inspected and prepared for your vehicle. It is programmed with new, updated software from GM.
What if my original part number is not on the list?
The part numbers listed (e.g., 12670335, 12668866) are often interchangeable. As long as your vehicle model and year are on our compatibility list, we can program this module to work perfectly for your application.