Restore Peak Performance to Your GM Vehicle
Is your work van or truck suddenly stalling, shifting erratically, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as the brain of your vehicle’s powertrain. A faulty ECM can cripple your vehicle’s performance, hurt fuel economy, and make it unreliable. This replacement Engine Control Module, part number 12643636, is the definitive solution to get your vehicle running smoothly again, without the excessive cost and scheduling headaches of a dealership visit.
We take the guesswork and complexity out of the repair. Before this module ships, we will program it with the latest official GM software updates, specifically matched to your vehicle using your VIN. This means it arrives at your door ready for a straightforward installation, restoring the precise fuel delivery, ignition timing, and transmission shifting your vehicle had when it was new. This isn’t just a replacement part; it’s a restoration of your vehicle’s core operational integrity.
A Technician’s Notebook: The Case of the Intermittent Work Van
A local contractor brought in his 2016 Savana 2500 with a frustrating problem. It would run perfectly for days, then suddenly start sputtering and stalling in traffic. No consistent codes, just a random U0100 (Lost Communication with ECM) that would appear and disappear. After checking all the wiring harnesses and grounds—a common first step—we suspected the ECM itself was failing internally, likely due to heat and vibration. Instead of a costly diagnostic path at the dealer, we opted for a VIN-programmed module. The swap took less than 30 minutes, and the van has been back on the road, running reliably for his business ever since. This is a prime example of how a quality, pre-programmed part is the most efficient fix for these ghost-in-the-machine issues.
Is Your Vehicle Showing These Symptoms?
- âś” Check Engine Light is illuminated with codes like P0601, P0606, or U0100.
- âś” The engine cranks but refuses to start.
- âś” Noticeable decrease in fuel efficiency.
- âś” The engine stalls, stumbles, or misfires intermittently.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to pass state emissions testing.
A Straightforward Guide to Installation
Installing your new 2016 Savana 2500 ECM is a manageable job for a DIY enthusiast or any professional technician. Follow these steps for a successful replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: On the Savana/Express vans, the ECM is typically located in the engine compartment on the driver’s side, near the firewall or inner fender.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): While not always required, some GM vehicles may need a simple security relearn procedure to sync the new ECM with the anti-theft system. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for specific steps if it fails to start.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. It is crucial to match your part number or verify your vehicle’s make, model, and engine option from the list below. This unit is compatible with part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
- Buick Encore: 2013-2016 (1.4L)
- Cadillac ELR: 2014-2016 (Gasoline)
- Chevrolet Cruze: 2012-2016 (Gasoline, 1.4L, or VIN P Limited)
- Chevrolet Express 2500/3500 Van: 2016 (4.8L, 6.0L)
- Chevrolet Silverado 2500/3500 Pickup: 2012-2016 (6.0L)
- Chevrolet Sonic: 2012-2016 (1.4L)
- Chevrolet Spark: 2014-2015 (Gasoline Model)
- Chevrolet Suburban 3500: 2016
- Chevrolet Trax: 2013-2016
- Chevrolet Volt: 2011-2015 (Gasoline)
- GMC Savana 2500/3500 Van: 2016 (4.8L, 6.0L) – Including the 2016 Savana 2500 ECM.
- GMC Sierra 2500/3500 Pickup: 2012-2016 (6.0L)
- GMC Sierra Denali 2500/3500: 2012-2016 (6.0L)
Frequently Asked Questions
What does VIN programming mean?
VIN programming is the process of loading your vehicle’s specific Vehicle Identification Number (VIN) and corresponding factory software into the ECM. This ensures the module communicates correctly with all other systems in your vehicle, like the transmission, anti-lock brakes, and instrument cluster, for seamless operation.
Do I need to have this part programmed by a dealer?
No. The main benefit of our service is that we handle all the programming for you before shipment. This saves you the time, towing fees, and high labor costs associated with dealer programming. It arrives ready to be installed.
Is this a simple plug-and-play installation?
Yes, for most vehicles, it is. Once you install the module, your vehicle should start and run correctly. In some cases, a simple ‘security relearn’ procedure, which does not require special tools, may be necessary. We provide instructions for this common scenario.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically find this on your vehicle’s dashboard (visible through the windshield on the driver’s side), on your insurance card, or on the driver’s side door jamb sticker.
Will this fix my vehicle’s check engine light?
If the check engine light and performance issues are caused by a faulty ECM, this part is the correct solution. It’s crucial to ensure a proper diagnosis has been performed, as other failing sensors or wiring issues can sometimes cause similar symptoms. This module will resolve issues related to internal ECM failure, such as code P0601.