Restore Your Van’s Reliability and Performance
Is your 2016 Savana 2500 Van experiencing frustrating issues like stalling, a no-start condition, or a persistent check engine light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine performance, fuel delivery, and emissions. A faulty ECM can cripple your workhorse, leading to downtime and lost revenue. This replacement ECM, part number 12668991, is the definitive solution to restore your van’s factory operation and get you back on the job with confidence.
As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause a cascade of confusing problems. You might notice poor fuel economy, erratic shifting, or a general lack of power. Our process eliminates the guesswork and the expensive trip to the dealership. We provide a high-quality replacement 2016 Savana 2500 Engine Control Module that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it communicates perfectly with your van’s other systems, just like the original part from the factory.
From the Diagnostic Bay: A Savana’s Mysterious Stall
A local contractor brought in his 2016 Savana 2500 with a problem that was driving him crazy: it would randomly stall at stoplights, but not every time. There were no consistent codes, just a generic P0606 (ECM Processor Fault) that would pop up occasionally. He’d already replaced the fuel pump and a couple of sensors with no luck. After hooking up my scope and monitoring the 5-volt reference circuits directly from the ECM, I noticed intermittent voltage drops that didn’t correspond to any sensor failure. This pointed directly to an internal fault in the module itself. We installed one of these VIN-programmed units, and the van has been running reliably for him ever since. It’s a great example of how a failing ECM can mimic other problems.
Is Your Van Exhibiting These ECM Failure Signs?
A failing ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that the engine computer may be the culprit. Proper diagnosis is key, but these are the most common symptoms I see in my shop.
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Intermittent stalling or rough idling for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The automatic transmission is shifting erratically or harshly.
- ✔ Loss of power and sluggish acceleration.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing the 2016 Savana 2500 Engine Control Module is a manageable job for a DIY enthusiast or professional mechanic. Since we program the module to your VIN, no additional programming is required. Just follow these general steps.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system to fully discharge.
- Locate the ECM: On the 2016 Savana/Express vans, the ECM is typically located in the left-hand rear of the engine compartment. It’s a metal box with several large electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all electrical harness connectors from the old ECM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘On’ position (without starting) for 10-15 seconds to allow the systems to initialize. Then, start your engine. The vehicle is ready to drive.
Verified Compatibility Across GM Models
While this is the correct part for your 2016 Savana 2500 Engine Control Module, it also serves as a direct replacement for a wide range of other GM vehicles and part numbers. Please verify your vehicle is on this list or that your original part number matches one of the following: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200.
Cadillac: ELR (2014-2016)
Chevrolet: Cruze (2012-2016), Express 2500/3500 Van (2016), Silverado 2500/3500 Pickup (2012-2016), Sonic (2012-2016), Spark (2014-2015), Suburban 3500 (2016), Trax (2013-2016), Volt (2011-2015)
GMC: Savana 2500/3500 Van (2016), Sierra 2500/3500 Pickup (2012-2016), Sierra Denali 2500/3500 (2012-2016)
Note: Specific options (engine size, etc.) apply. Please review the full fitment list or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this number to load the latest GM-certified software for your specific vehicle onto the module. This ensures it works seamlessly once installed, with no need for a trip to the dealer.
Is this a simple plug-and-play installation?
Yes! Because we program the module before shipping, it arrives ready to install. Simply disconnect the battery, swap the old module with the new one, reconnect the battery, and you’re good to go. No special tools or software are required.
Where is the ECM located on a 2016 Savana 2500 Van?
The Engine Control Module is typically found in the engine bay, on the driver’s side, toward the rear of the compartment. It is a silver metal box with multiple large wiring harness connectors attached to it.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601, P0606), then this part is the correct fix. However, the check engine light can be triggered by hundreds of other issues. Always perform a proper diagnosis to confirm the ECM is the root cause before ordering.
What happens if I don’t provide my VIN?
We cannot ship the module without your VIN. The programming is essential for the part to function correctly in your vehicle. We will contact you after your purchase to request the VIN to prevent any delays with your order.
Does this part fit other vehicles besides the Savana van?
Yes, this ECM is used across a wide variety of GM vehicles, including the Silverado, Sierra, Cruze, and Sonic. Please check the detailed compatibility list on this page to ensure it matches your specific make, model, and year.