Is Your 2016 Savana 2500 Running Rough?
As the central computer for your workhorse van, the Engine Control Module (ECM) is responsible for managing everything from fuel mixture and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of frustrating and often misdiagnosed issues, leaving your vehicle unreliable and potentially unsafe. If you’re experiencing erratic engine behavior, a persistent check engine light, or a no-start condition, a failing ECM could be the culprit.
The Direct-Fit, Programmed Solution
Replacing the ECM on a modern vehicle isn’t as simple as swapping parts. The module must be programmed specifically to your van’s unique Vehicle Identification Number (VIN) to communicate with the other onboard systems. This typically means a costly trip to the dealership for programming fees. We eliminate that step. This genuine GM Engine Control Module, part number 12668991, arrives at your door fully programmed with the latest GM software updates for your specific 2016 Savana 2500. Simply provide your VIN after purchase, and our experts will flash the module, making it a true plug-and-play solution for your engine’s operating system.
From the Diagnostic Bay
We had a 2016 Express van (which uses the same ECM) come into the shop with a complaint of intermittent stalling at stoplights. The driver, a plumber, said it was costing him time and money. We scanned it and got a slew of communication error codes that didn’t point to any single sensor. After checking the main power and ground wires to the ECM, we suspected the module itself was failing internally. Instead of a lengthy and expensive diagnostic path, we installed a VIN-programmed ECM. After the quick 30-minute security relearn, the van started right up and the stalling issue was completely gone. Getting a pre-programmed unit got this professional back on the road and back to work the same day.
Common Symptoms of a Failing 2016 Savana 2500 ECM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Engine stalls unexpectedly or struggles to start.
- ✔ Noticeable decrease in fuel economy and engine performance.
- ✔ Rough or erratic idling and hesitation during acceleration.
- ✔ Automatic transmission shifting issues or harsh engagement.
- ✔ No communication with the ECM when using a diagnostic scan tool.
- ✔ The vehicle’s anti-theft or security light stays illuminated.
Installation and Security Relearn
Physically installing the module is straightforward. It’s typically located in the engine compartment on the driver’s side. After disconnecting the battery and swapping the module, you will need to perform a security relearn procedure. This allows the new ECM to recognize your existing keys. This is a simple process that you can do yourself and does not require any special tools.
Standard GM Relearn Procedure (Consult your service manual to confirm):
- Turn the key to the “ON” position (do not start the engine).
- Observe the security light. It will turn on and then go out after about 10 minutes.
- Within 10 seconds, turn the key to “OFF”.
- Repeat steps 1-3 two more times for a total of three 10-minute cycles.
- After the third cycle, the vehicle will have learned your key’s transponder code. Turn the key to OFF, then start the engine.
This module is a direct replacement for part number 12668991 and is also compatible with a wide range of other GM vehicles and part numbers, including 12668866, 12668994, 12643636, and more. It is a common ECM for vehicles like the Chevrolet Cruze, Sonic, Trax, and heavy-duty trucks like the Silverado 2500/3500 and Sierra 2500/3500 with the 6.0L engine.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We program the module to the VIN you provide before we ship it. It arrives ready for installation and the security relearn procedure.
What is a VIN and where can I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, this part will resolve the issue. It is crucial to ensure a proper diagnosis has been performed, as the light can be triggered by many other components like sensors or wiring problems.
Is the security relearn procedure difficult?
Not at all. The standard procedure involves cycling the ignition key and waiting, typically for a total of 30 minutes. It requires no special tools and can be done in your driveway.
Is this part compatible with other vehicles?
Yes, this ECM fits a wide variety of GM vehicles, including the Chevy Express, Silverado, Cruze, Sonic, and GMC Sierra, among others. Please verify your original part number or consult the fitment list to ensure compatibility.