Is Your 2016 Chevy Express Van Running Rough?
If your reliable workhorse is suddenly stalling, misfiring, showing a persistent check engine light, or suffering from poor fuel economy, the problem might be its electronic brain: the Engine Control Module (ECM). The ECM is the central command center for your engine, managing everything from fuel injection and ignition timing to emissions control and transmission communication. When it fails, it can cause a wide range of frustrating and performance-robbing issues. This isn’t just an inconvenience; for a work vehicle like the Express 2500, downtime means lost money. Don’t let a faulty computer put your work on hold.
The Plug-and-Play Solution for Your GM Vehicle
This Engine Control Module, corresponding to GM part number 12668866 and interchangeable with several other numbers, is the definitive solution to get your vehicle back in top form. We take the guesswork and high dealership costs out of the equation. Before this module ships, we professionally program it with the latest official GM software updates, specifically matched to your vehicle’s unique VIN. This means it arrives at your door ready for a straightforward installation, eliminating the need for expensive scan tools or a trip to the dealer for programming.
From the Diagnostic Bay
We had a 2016 Express 2500 work van come into the shop with a classic complaint: it would randomly stall at traffic lights and had a hard time starting on cold mornings. The check engine light was on, with codes pointing to random misfires and a communication error. The owner had already replaced the spark plugs, wires, and a coil pack with no improvement. After verifying fuel pressure and checking for vacuum leaks, we hooked up our scope to the injector and ignition control wires at the ECM. We found the signal to cylinder 3’s injector was dropping out intermittently. A quick check of the wiring harness showed no damage. The culprit was an internal failure in the original ECM. We installed one of our pre-programmed modules, performed a quick CASE relearn, and the van ran like new. The customer was back on the road the same day, saving hundreds compared to the dealership’s quote.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, stumbling, or misfiring, especially under load.
- ✔ Noticeable decrease in fuel economy.
- ✔ Difficulty starting the engine, or a complete no-start condition.
- ✔ Poor acceleration and overall loss of engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication error codes with other vehicle modules.
Why Choose Our Pre-Programmed 2016 Express 2500 Engine Control Module?
Choosing our module is the smartest way to repair your vehicle. You get a reliable, fully updated component that is tailored specifically for your van. The process is simple: place your order, provide us with your VIN, and we handle the complex programming. This ensures all the specific parameters for your engine (4.8L or 6.0L), transmission, and emissions equipment are correctly loaded. This direct-fit 2016 Express 2500 Engine Control Module restores factory performance and reliability without the factory price tag.
Broad Compatibility Across the GM Lineup
While this is a perfect fit for the 2016 Express and Savana vans, this versatile module (part number 12668866) is also the correct component for a wide range of other GM cars, trucks, and SUVs. It is compatible with models like the Chevrolet Silverado 2500/3500, GMC Sierra 2500/3500, Chevrolet Cruze, Sonic, Trax, Buick Encore, and more. Please review the detailed fitment list to confirm this part is right for your specific vehicle.
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 to your vehicle’s VIN before we ship it. It will arrive ready to be installed, saving you time and the high cost of dealership programming.
Where is the ECM located on my 2016 Chevy Express 2500?
On the 2016 Express and Savana vans, the Engine Control Module is typically located in the left-hand (driver’s side) rear of the engine compartment. Always disconnect the vehicle’s battery before attempting to remove or install the module.
What is a CASE Relearn and will I need to do one?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new ECM with your engine’s crankshaft position sensor. In some cases, this may be required after installation to clear a specific check engine light code (P0315). Many mid-range scan tools can perform this procedure, or it can be done by any qualified mechanic.
How do I provide my vehicle’s VIN?
After you complete your purchase, we will send you an email requesting your VIN. You can also add your VIN to the notes section during checkout. We cannot program and ship your module without the correct VIN.
My old module has a different part number. Will this still work?
Yes, this module replaces several GM part numbers. This unit is a direct replacement for 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.