Restore Your Truck’s Brain and Get Back on the Road
If you’re dealing with frustrating, hard-to-diagnose issues on your 2009-2012 Chevy Colorado or GMC Canyon, the problem often lies with a failing Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of problems that seem unrelated, from poor fuel mileage and stalling to a persistent check engine light. This isn’t just a part; it’s the central computer for your engine, and when it fails, your truck’s performance and reliability suffer.
This is your direct, hassle-free solution. We are offering a genuine GM Engine Control Module, service number 12636659, that arrives at your door fully programmed to your vehicle’s specific VIN. Forget about expensive towing fees or paying dealership labor rates for programming. Simply provide your VIN at checkout, and we’ll handle the complex part, loading the latest GM software updates before we ship. This ensures optimal performance, fuel efficiency, and emissions compliance right out of the box.
A Technician’s Notebook: The Phantom Misfire Case
I once had a 2011 Colorado in the bay that was driving the owner crazy. It had an intermittent misfire that never set a specific cylinder code, just a random misfire P0300. The owner had already replaced plugs, coils, and even an injector. After hours of diagnostics, checking wiring harnesses and fuel pressure, we hooked up a scope to the injector drivers at the ECM. We found the signal for cylinder 4 would occasionally drop out for a millisecond—too fast to set a code but enough to cause a stumble. A replacement 2009-2012 Colorado ECM, programmed to the VIN, solved the issue instantly. It’s a classic example of how a failing computer can mimic a mechanical problem, costing hundreds in unnecessary parts.
Is Your Truck Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Check Engine Light is on with internal processor codes like P0601, P0606, or U0100 communication codes.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The engine stalls, stumbles, or hesitates, especially under load.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of communication with your diagnostic scan tool.
A Straightforward Guide to Installation
Installing your new 2009-2012 Colorado ECM is a job most DIYers can handle in their own driveway. Our VIN programming service makes this a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On the Colorado and Canyon, the ECM is typically located on the right-hand (passenger side) 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. Keep the hardware as you will reuse it.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect and Secure: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect your battery terminal.
- Final Step: Some vehicles may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for specific instructions. Your truck is now ready to start.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles. It is interchangeable with service numbers 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. Please confirm your vehicle is on the list below for guaranteed compatibility.
- Cadillac CTS (2009): 6.2L
- Cadillac DTS (2009-2011)
- Cadillac SRX (2009): 4.6L
- Cadillac STS (2009-2010): 4.4L, 4.6L
- Cadillac XLR (2009): ID 12636659 or 12625453
- 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)
Do I need to do any programming myself?
No. This ECM comes fully programmed to your vehicle’s VIN. We handle all the flashing with the latest GM software before it ships, making it ready for installation right out of the box.
Where do I provide my VIN?
Please enter your 17-digit Vehicle Identification Number (VIN) during the checkout process. This is crucial for us to program the module correctly for your specific vehicle.
Is this a used part?
This is a high-quality, tested, and verified genuine GM service replacement part. It has been inspected and programmed to function to original equipment specifications.
Will this fix my check engine light?
If the check engine light is caused by an internal ECM failure (like codes P0601-P0606) or a faulty component driver within the module, then yes, this will resolve the issue. It’s important to ensure your vehicle’s underlying mechanical or wiring issues have been addressed first.
What if my original part number is different?
This module, 12636659, is the master service replacement for several part numbers, including 12639300, 12628993, and others listed above. As long as your vehicle is on the compatibility list, this part will function correctly.