Is Your GMC Canyon Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition, a failing Engine Control Module (ECM) is a likely culprit. For years in my shop, I’ve seen these symptoms frustrate owners, often leading to expensive diagnostic guesswork. The ECM is the brain of your truck’s engine, and when it fails, it can cause a cascade of problems that sideline your vehicle. Don’t let a faulty computer keep you off the road. This is the reliable, straightforward solution you need.
The Direct-Fit Solution: A Pre-Programmed 2009-2012 Canyon ECM
This isn’t just a replacement part; it’s a complete fix. We are offering a genuine GM Engine Control Module, service number 12678512, that arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). We handle the complex part, loading the latest GM-authorized software and calibrations so you don’t have to. This eliminates the need for a costly trip to the dealership for programming, saving you time and money.
- ✔ VIN-Programmed for Your Truck: Simply provide your VIN at checkout, and we’ll flash the module specifically for your Canyon.
- ✔ Resolves Common Failures: Effectively corrects issues like false sensor codes, harsh shifting, poor fuel economy, and intermittent stalling.
- ✔ Latest GM Software: Your ECM will be loaded with the most recent software updates from General Motors, ensuring optimal performance and efficiency.
- ✔ No Dealer Visit Needed: This is a true plug-and-play solution. Install it yourself and get back to driving.
Expert Pro Tip: Check Your Connections First
Before you condemn your old ECM, take 10 minutes to inspect the harness connectors. On these Canyons and Colorados, the ECM is mounted on the firewall where it’s exposed to heat and moisture. I’ve seen cases where oxidized pins or a loose ground wire mimic complete ECM failure. Unplug the connectors, check for any green or white corrosion, and ensure they seat firmly with a solid ‘click’. A little bit of contact cleaner can save you a lot of hassle. If the connections are clean and tight and the problem persists, you can be confident the module is the issue.
Simple Plug-and-Play Installation Guide
Replacing the ECM on your Canyon is a job most DIYers can handle in under 30 minutes with basic tools. It’s located on the passenger-side firewall in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the ECM: Open the hood and find the module on the right-hand (passenger side) firewall.
- Disconnect Wiring: Carefully unplug the electrical harness connectors from the old ECM. There are typically release tabs that need to be depressed or levers that swing out to unlock them.
- Remove Old Module: Unbolt the old ECM from its mounting bracket.
- Install New Module: Bolt the new, pre-programmed ECM into place.
- Reconnect Wiring: Firmly plug the harness connectors into the new module until they click securely into place.
- Final Step: Reconnect the negative battery terminal. The vehicle may need to run for a few minutes to complete its internal relearn processes.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with the following service part numbers:
12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512.
While this listing focuses on the 2009-2012 GMC Canyon, this ECM also fits many other models, including the Chevrolet Colorado, Hummer H3, Cadillac CTS, Corvette, and more. Providing your VIN ensures we deliver a part that is 100% correct for your specific vehicle and its options.