Restore Your Truck’s Brain and Get Back on the Road
Is your 2009-2012 Chevrolet Colorado giving you headaches? If you’re dealing with a persistent Check Engine Light, unpredictable stalling, rough idling, or a frustrating no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As a technician with over two decades of experience under the hood, I’ve seen countless drivers chase expensive sensor replacements when the core issue was the vehicle’s computer. This isn’t just a part; it’s the central command for your engine’s performance, and when it falters, your entire truck suffers.
We offer a straightforward, reliable solution. This genuine GM ECM, service number 12628993, is the definitive fix for these complex electronic issues. The best part? We handle the most critical step for you. Before this module ships, we will program it with the latest GM software updates specifically matched to your truck’s Vehicle Identification Number (VIN). This means no expensive trip to the dealership and no need for specialized programming tools. It arrives at your door ready for a simple, direct installation, restoring the crisp performance and reliability you depend on.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2011 Colorado that came into my shop with an issue that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random communication errors. We checked fuel pressure, ignition components, and wiring harnesses—all were fine. On a hunch, I gently tapped the ECM while the engine was idling, and it immediately stumbled. The culprit was an internal failure in the original 2009-2012 Colorado ECM, causing intermittent connection breaks. Swapping in a pre-programmed module like this one solved the problem permanently in under 30 minutes. It’s a classic example of how a direct-fit, correctly programmed part can save hours of diagnostic guesswork and frustration.
Common Signs of a Failing ECM
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Noticeable loss of power and poor acceleration.
- ✔ Rough or erratic engine idling and stalling.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Your scan tool cannot communicate with the computer.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the ECM: On the 2009-2012 Colorado/Canyon, the ECM is typically mounted on the right-hand (passenger side) of the firewall in the engine bay.
- ✔ Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old module. Inspect the connectors for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s usually held in place by a few small bolts.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- ✔ Reconnect and Finalize: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal. Your installation is complete!
Will This Fit My Vehicle?
This ECM is a direct replacement for a wide range of General Motors vehicles. While it’s a primary fit for the 2009-2012 Colorado ECM, please verify your model and engine below. This part is interchangeable with service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
- CANYON 09-12 (RH firewall)
- COLORADO 09-12 (RH firewall)
- CORVETTE 09 (RH engine compartment), ZR1
- CTS 09 (RH front engine compartment), 6.2L
- DTS 09-11
- ENVOY 09 (LH engine), 5.3L
- HUMMER H3 09-10 (RH firewall)
- LUCERNE 09-11 (lower part of air cleaner box), 4.6L
- SAAB 9-7X 09 (LH engine)
- SRX 09 (LH engine compartment), 4.6L
- STS 09-10 (LH frame rail), 4.4L or 4.6L
- TRAILBLAZER 09 (LH engine), 6.0L
- XLR 09 (RH front engine compartment)
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software your vehicle requires based on its unique 17-digit Vehicle Identification Number (VIN). This ensures all systems, including the engine, transmission, and security (anti-theft), function correctly together, just like the original part from the factory.
Do I need to do anything after installation?
In most cases, no. Because the module is pre-programmed, it is a plug-and-play installation. However, some vehicles may require a security relearn procedure, which is a simple process that can typically be done without special tools. Instructions are readily available online or in your vehicle’s service manual.
Is this a guaranteed fix for my Check Engine Light?
If the Check Engine Light is caused by an internal ECM failure (like codes P0601-P0606), then yes, this will resolve the issue. It’s crucial to properly diagnose the problem first, as the light can also be triggered by faulty sensors or wiring.
Where do I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard, visible through the windshield. Please provide this number during checkout.
Will this work for my 2.9L and 3.7L Colorado?
Yes, this module is compatible with the 2010-2012 Colorado and Canyon models equipped with either the 2.9L 4-cylinder or the 3.7L 5-cylinder engines, as well as the 2009 models. We use your VIN to ensure the correct software is loaded for your specific engine and options.