Restore Peak Performance to Your Workhorse Van
Is your 2016 Savana 2500 van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times. Often, the root cause isn’t a simple sensor but the very brain of the engine: the Engine Control Module (ECM). A failing ECM can cause a cascade of frustrating, hard-to-diagnose problems, costing you time and money. This isn’t just a replacement part; it’s a reliable, long-term solution designed to get your van back on the road and working as hard as you do.
We take the guesswork and hassle out of the repair. This ECM, part number 12663405, arrives at your door pre-programmed with the latest official GM software, specifically flashed to your vehicle’s unique Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming and no need for specialized scan tools. It’s a direct-fit, plug-and-play solution that restores factory engine parameters, fuel efficiency, and emissions compliance.
Case Study: The Phantom Stall
A local contractor brought in his 2016 Express 2500—a cousin to the Savana with the same powertrain. The van would randomly stall at stoplights, with no warning and no consistent trouble codes. He’d already replaced the throttle body and a camshaft position sensor with no luck. After connecting my professional scan tool, I noticed intermittent communication loss with the ECM (a classic U0100 code). Instead of throwing more parts at it, we inspected the ECM’s connectors and wiring, which were fine. The issue was internal to the module. We installed a VIN-programmed ECM just like this one, performed an idle relearn, and the van ran flawlessly. The customer was back on the job site the next day, relieved that the frustrating and costly guessing game was over. This is the kind of definitive fix this part provides.
Is Your GM Vehicle Showing These Symptoms?
A faulty ECM can manifest in various ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
- ✔ Intermittent or complete no-start conditions
- ✔ Poor fuel economy and engine performance
- ✔ Rough or unstable idling
- ✔ Transmission shifting problems or harsh shifts
- ✔ Failure to pass state emissions testing
- ✔ Communication errors with scan tools
A Straightforward Guide to Your 2016 Savana 2500 ECM Installation
Replacing the ECM is a task many DIYers and professionals can handle with basic tools. Our pre-programmed module makes it even simpler.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- 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 and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Perform Relearn Procedure: While not always required, it’s good practice to perform a security and idle relearn. Often, this can be done by simply turning the key to the ‘ON’ position for 10-15 minutes, then off, and then starting the vehicle and letting it idle for several minutes to stabilize.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12663405 and other interchangeable numbers. It is guaranteed to fit the following vehicles with the specified options:
- Buick Encore: 2013-2016 (1.4L)
- Cadillac ELR: 2014-2016
- Chevrolet Cruze: 2012-2016 (Gasoline models)
- Chevrolet Express 2500/3500 Van: 2016 (4.8L, 6.0L)
- Chevrolet Silverado 2500/3500 Pickup: 2012-2016 (6.0L)
- Chevrolet Sonic: 2012-2016
- Chevrolet Spark: 2014-2015 (Gasoline)
- Chevrolet Suburban 3500: 2016
- Chevrolet Trax: 2013-2016
- Chevrolet Volt: 2011-2015
- GMC Savana 2500/3500 Van: 2016 (4.8L, 6.0L)
- GMC Sierra 2500/3500 & Denali Pickup: 2012-2016 (6.0L)
Note: This part is a replacement for part numbers 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. Please verify your part number or contact us with your VIN to ensure compatibility.
How do I provide my VIN for programming?
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions to reply with your vehicle’s 17-digit VIN. We cannot ship the part until we receive your VIN, as the programming is specific to your vehicle.
Is this part truly plug-and-play?
Yes. Because we program it to your VIN with the latest GM software, it will not require any additional programming from a dealer or mechanic. In some cases, a simple idle or security relearn procedure (which requires no special tools) may be necessary after installation.
Will this fix my vehicle’s specific problem?
This module is a direct solution for failures internal to the ECM itself, which cause the symptoms listed above. It’s crucial to ensure your vehicle’s wiring, sensors, and other components are in good working order. A proper diagnosis is key to a successful repair.
What if my original part number is different?
This ECM is a direct replacement for several GM part numbers, including 12668866, 12668994, 12643636, and others listed in the description. As long as your vehicle is on the compatibility list, this module will function correctly.