Restore Your Truck’s Performance and Reliability
Is your 2009-2012 Chevrolet Colorado running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer of your vehicle. A faulty ECM can cripple your truck’s performance, hurt fuel economy, and leave you stranded. This replacement ECM, part number 12678512, is the definitive solution to get your vehicle operating like new again.
What sets our service apart is the convenience and confidence we provide. Forget about expensive dealership visits or the hassle of finding a shop with the right programming tools. We handle the critical programming for you before we ship. Simply provide your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and function right out of the box. This is the most direct path to fixing complex electronic issues and restoring the performance you depend on.
A Technician’s Notebook: The Intermittent Stall
I once had a 2011 Colorado in my bay that was causing its owner endless frustration. It would randomly stall at stoplights, but then start right back up. No consistent codes were stored, just a generic U0100 (Lost Communication with ECM) every now and then. We checked grounds, wiring, and the fuel system—all perfect. On a hunch, based on experience with these platforms, we tapped on the original ECM while the engine was running. The engine immediately stumbled. The problem was an internal failure in the module, likely from years of heat cycles and vibration. Swapping in a pre-programmed 2009-2012 Colorado ECM like this one solved the problem in under 20 minutes. It’s a textbook example of how a simple component swap can fix a maddeningly intermittent issue.
Is Your Colorado Exhibiting These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or cutting out for no reason
- ✔ Rough or erratic idle
- ✔ Noticeable decrease in fuel efficiency
- ✔ Vehicle won’t start, but the battery and starter are good
- ✔ Communication error codes, such as P0601, P0606, or U0100
- ✔ Transmission shifting problems or harsh engagement
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. Because it arrives programmed, it’s a true plug-and-play fix. Just follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge.
- Locate the ECM: On the 2009-2012 Colorado and Canyon, the ECM is typically located on the right-hand (passenger) side of the firewall in the engine bay.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the old module. Do not force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few small bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click securely in place. Reconnect the negative battery terminal.
- Final Step: Start the engine. Your vehicle is now ready to drive with its new, properly functioning brain.
Verified Fitment Across Multiple GM Models
While this is a primary solution for the 2009-2012 Colorado ECM, this versatile module (service # 12678512) is also a direct replacement for a wide range of GM vehicles. It is interchangeable with part numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, and 12630464. Please confirm your vehicle is on the list below:
- Cadillac CTS: 2009 (6.2L)
- Cadillac DTS: 2009-2011
- Cadillac SRX: 2009 (4.6L)
- Cadillac STS: 2009 (4.4L, 4.6L), 2010 (4.6L)
- Cadillac XLR: 2009
- Chevrolet Colorado: 2009-2012 (2.9L, 3.7L)
- Chevrolet Corvette: 2009 (ZR1)
- Chevrolet Trailblazer: 2009 (6.0L)
- GMC Canyon: 2009-2012 (2.9L, 3.7L)
- GMC Envoy: 2009 (5.3L)
- Hummer H3: 2009-2010 (3.7L)
- Buick Lucerne: 2009-2011 (4.6L)
- Saab 9-7X: 2009
Frequently Asked Questions
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. It arrives ready for installation with no additional programming required.
How do I provide my VIN?
You can enter your 17-digit VIN in the designated field on the product page or during the checkout process. Please double-check it for accuracy.
Will this fix my specific problem or check engine light?
This module is the direct solution for issues originating from a faulty ECM, including many communication and internal processor codes. While it resolves the most common electronic failures, always ensure your vehicle has been properly diagnosed.
Where is the ECM located on my 2010 Colorado?
On most 2009-2012 Colorado and Canyon models, the ECM is mounted to the firewall on the passenger side of the engine compartment.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several service numbers, including 12636659, 12639300, 12628993, and others listed in the description.