Is Your 2009-2012 GMC Canyon Running Rough or Refusing to Start?
If you’re dealing with a persistent check engine light, baffling electrical issues, or a truck that just won’t run right, a failing Engine Control Module (ECM) is a likely culprit. As a technician with over 20 years of experience, I’ve seen firsthand how a faulty ECM can turn a reliable truck into a source of constant frustration. It’s the brain of your engine, and when it starts to fail, it can cause a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs.
The Direct-Fit Solution: A VIN-Programmed ECM
This isn’t just a replacement part; it’s a complete solution. We take a genuine OEM engine computer and professionally program it to your truck’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the module communicates flawlessly with your engine, transmission, and security systems right out of the box. You get the latest GM software updates, which can resolve factory bugs and improve overall performance and efficiency.
Expert Pro Tip: Don’t Replace the Fuel Pump Yet!
On these 2009-2012 Canyon and Colorado trucks, a failing ECM can mimic a bad fuel pump by not sending the ‘on’ signal to the fuel pump relay. If you have a no-start condition, always verify communication with the ECM using a scan tool before replacing other parts. This simple check has saved my customers hundreds of dollars in unnecessary repairs.
Is Your GMC Canyon Showing Signs of a Failing ECM?
A bad engine computer can manifest in many ways. If you’re experiencing any of the following, this module is the solution you need:
- ✔ Unexplained Check Engine Light (CEL) that won’t go away.
- ✔ Complete no-start or intermittent starting issues.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Noticeable drop in fuel economy.
- ✔ Engine stalling, sputtering, or misfiring.
- ✔ Communication error codes (U-codes) with a scan tool.
Simple, DIY-Friendly Installation for the 2009–2012 Canyon ECM
Because we handle the programming, you avoid a costly trip to the dealership. Installing your new ECM is a straightforward process you can do in your own driveway. For the GMC Canyon and Chevy Colorado, the ECM is conveniently located on the passenger side firewall in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the ECM: Find the module on the right-hand (passenger side) firewall.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harnesses from the old module. Inspect the connectors for any corrosion or bent pins.
- Remove Old Module: Unbolt the old ECM from its mounting bracket.
- Install New Module: Bolt the new, pre-programmed ECM into place.
- Reconnect: Securely plug the wiring harnesses into the new module. You should hear a click as they lock in.
- Final Step: Reconnect the negative battery terminal. Your truck is now ready to start.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and is fully interchangeable with several service numbers. Please provide your VIN upon checkout to ensure perfect programming for your vehicle.
Replaces Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
While this listing is for the 2009–2012 Canyon ECM, it also fits many other models including the Chevy Colorado, Hummer H3, Cadillac CTS, Corvette, and more, restoring them to factory-specified operation.