Is Your GMC Canyon Acting Unpredictable?
As a mechanic with over two decades of experience under the hood, I’ve seen it all when it comes to electronic gremlins. If your 2009-2012 Canyon is suddenly stalling, running rough, refusing to start, or flashing a persistent Check Engine Light with codes you can’t seem to solve, the problem often points directly to a failing Engine Control Module (ECM). It’s the brain of your truck, and when it starts to falter, the symptoms can be confusing and frustrating. You might be chasing sensor codes or fuel delivery issues, but the root cause is the computer itself.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take a genuine GM ECM, service number 12639300, and professionally program it with the very latest GM-certified software specifically for YOUR vehicle’s VIN. This means no expensive trips to the dealership for programming, no special tools, and no headaches. It arrives at your door ready to install.
Why Choose Our 2009–2012 Canyon ECM?
Getting your truck back to factory-spec performance is our top priority. A faulty ECM can leave you stranded, but this direct-fit replacement restores critical engine and transmission functions, ensuring reliability for years to come. Forget the guesswork and get the right part, programmed correctly, the first time.
- ✔ Eliminate Common Failure Symptoms: Puts an end to random stalling, no-start conditions, erratic engine behavior, and false sensor codes.
- ✔ VIN-Programmed for You: We flash the module with your truck’s specific VIN, ensuring all systems, including anti-theft (Passlock/VATS), communicate perfectly.
- ✔ Latest GM Software Updates: Your module will have the most recent software from General Motors, which often corrects drivability issues the original software had.
- ✔ True Plug-and-Play Solution: No additional programming is required. Simply install the module, and you’re ready to go.
Expert Pro Tip from a 20-Year Veteran: Before you condemn your old ECM, take a close look at the wiring harness connectors that plug into it. Over the years, I’ve seen dozens of cases where moisture intrusion or road grime causes corrosion on the connector pins. This poor connection can mimic a complete ECM failure. Before installing your new module, use a small wire brush and some quality electronic contact cleaner to thoroughly clean both the male and female ends of the harness connectors. A clean connection is critical for the new module to function correctly.
Simple Installation Guide: Get Back on the Road Fast
Replacing the ECM on your Canyon or Colorado is a straightforward job you can do in your own driveway. On these trucks, it’s typically located on the right-hand (passenger side) of the firewall in the engine bay.
- Safety First: Always disconnect the negative terminal from your truck’s battery and wait about 10 minutes to allow the system to fully discharge.
- Locate the ECM: Open the hood and find the module on the passenger-side firewall. It’s a silver metal box with several large electrical connectors.
- Disconnect the Harnesses: Carefully release the locking levers or tabs on the electrical connectors. These can be brittle, so apply steady, even pressure. Pull the connectors straight out.
- Unbolt the Old Module: Remove the bolts or nuts holding the old ECM to the firewall. Keep the hardware, as you’ll need it for the new module.
- Install the New ECM: Mount your new, pre-programmed ECM using the original hardware. Ensure it is seated securely.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until the locking levers click into place. Reconnect your negative battery terminal.
- Final Check: Turn the key to the ‘ON’ position (without starting the engine) for 10-15 seconds to allow the systems to initialize, then start your truck. Your Check Engine Light should be off, and the engine should run smoothly.
Guaranteed Fitment & Interchangeability
This module is a direct replacement for a wide range of GM vehicles and is fully interchangeable with the following service part numbers:
Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
While this is the primary solution for the 2009–2012 Canyon ECM, it also fits many other models. Please verify your part number or contact us to confirm compatibility for vehicles including the Colorado, Hummer H3, Trailblazer, Envoy, Corvette, CTS, STS, SRX, XLR, DTS, Lucerne, and Saab 9-7X within the specified year ranges.