If your 2016 Savana 2500 work van is suddenly unreliable, you’re not just inconvenienced—you’re losing money. As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring a dependable vehicle to a dead stop. Mysterious electrical issues, poor performance, and a persistent Check Engine Light are often symptoms of a faulty ECM, the brain of your vehicle’s engine. This isn’t just a part; it’s the command center for your engine’s performance, fuel efficiency, and emissions.
We take the guesswork and high cost out of the equation. This genuine OEM ECM, part number 12670335, arrives at your door fully programmed with the latest GM-certified software updates. All we need is your vehicle’s VIN at checkout. This means no expensive trips to the dealership, no special programming tools required, and a straightforward path to getting your van back on the road and earning its keep. It’s the reliable, professional-grade solution your business depends on.
Case Study: The Ghost in the Machine
A local contractor brought in his 2016 Savana 2500 with a 6.0L engine, complaining of intermittent stalling at stoplights and a random hard shifting problem. He’d already replaced the throttle body and a speed sensor at another shop, but the problem persisted. No consistent trouble codes were stored, just a history of U0100 (Lost Communication) codes. After checking the network wiring and connectors, my gut told me to look at the ECM. On the bench, I found a microscopic crack in a solder joint on the main processor, likely from years of heat cycles and vibration. A new, properly programmed 2016 Savana 2500 ECM solved all his issues instantly. It’s a classic example of how the ECM can cause symptoms that seem unrelated, making a quality replacement the only true fix.
Is Your Savana Van Exhibiting These Red Flags?
- ✔ Unexplained Check Engine Light illumination.
- ✔ Engine cranks but refuses to start.
- ✔ Stalling, stumbling, or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100 stored in memory.
- ✔ Failure to pass an emissions inspection.
Why This Programmed 2016 Savana 2500 ECM is the Smart Choice
Replacing a modern ECM isn’t just a mechanical swap; it requires precise software integration. This module solves that challenge by providing a complete, ready-to-install component. We handle the complex programming using your VIN, ensuring that all factory settings for your specific vehicle—including engine size, transmission type, and emissions equipment—are perfectly loaded. This restores original performance and communication between all vehicle modules, eliminating the errors caused by a failing unit.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all systems to power down.
- ✔ Locate the ECM: On the 2016 Savana/Express vans, the ECM is typically located in the rear of the engine compartment on the driver’s side.
- ✔ Disconnect Connectors: Carefully release the locking tabs and disconnect all electrical wiring harnesses from the old ECM. Avoid forcing them.
- ✔ Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
- ✔ Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: 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 3 times. Your vehicle should then start.
Verified Vehicle Compatibility
This Engine Control Module is a direct replacement for part numbers 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200, and fits a wide array of GM vehicles. While this listing focuses on the 2016 Savana 2500 ECM, please confirm your part number or consult the list below:
Chevrolet: Cruze (12-16), Express 2500/3500 Van (16), Silverado 2500/3500 (12-16), Sonic (12-16), Spark (14-15), Suburban 3500 (16), Trax (13-16), Volt (11-15)
GMC: Savana 2500/3500 Van (16), Sierra 2500/3500 (12-16), Sierra Denali 2500/3500 (12-16)
Note: Please verify specific engine options and module IDs as listed in the original data to ensure perfect fitment.
Frequently Asked Questions
Do I need to send my old ECM back (core charge)?
No, there is no core charge associated with this purchase. You can keep or recycle your old part.
Is this part difficult to install for a DIYer?
The physical installation is straightforward for anyone with basic mechanical skills. The main benefit of our service is that the complex computer programming is already done for you, making it a plug-and-play process. You may need to perform a simple security relearn procedure, which we’ve outlined above.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the module until we receive and validate your VIN to ensure correct programming.
What if my part number is slightly different?
This module replaces several part numbers, including 12668866, 12643636, and others listed. As long as your original part number is on our cross-reference list, this module will function correctly in your vehicle once programmed to your VIN.
Will this fix my ‘No Start’ problem?
A faulty ECM is a very common cause of a ‘crank, no-start’ condition. While other issues like a bad fuel pump or crank sensor can cause this, if you’ve diagnosed the issue to be the ECM, this part is the correct solution.