Is your 2010-2012 Chevrolet Colorado running rough, stalling unexpectedly, or refusing to start altogether? A failing Engine Control Module (ECM) is often the culprit behind these frustrating and hard-to-diagnose issues. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cripple a perfectly good truck, leaving owners stranded and confused. This isn’t just a part; it’s the central computer for your engine, and when it fails, everything from fuel delivery to spark timing can go haywire.
This replacement ECM, part number 12678513, is the definitive solution to restore your truck’s factory performance and reliability. The biggest hurdle with ECM replacement has always been the expensive and time-consuming programming required at a dealership. We eliminate that problem completely. Before we ship this module, we flash it with the latest official GM software, precisely matched to your truck’s unique Vehicle Identification Number (VIN). This means it arrives at your doorstep ready for a straightforward, plug-and-play installation, getting you back on the road faster and saving you hundreds in dealer fees and towing costs.
Is Your Truck Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention. In my shop, these are the classic signs we look for when diagnosing a faulty 2010-2012 Colorado ECM.
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Diagnostic Trouble Codes (DTCs) for internal module failure, such as P0601, P0602, P0606
- ✔ Complete no-start or crank-no-start condition
- ✔ Intermittent stalling or engine hesitation
- ✔ Poor fuel economy and reduced engine power
- ✔ Erratic automatic transmission shifting
- ✔ Communication loss with other vehicle modules (U-codes)
- ✔ Failure to pass state emissions testing
From the Diagnostic Bay
I remember a 2011 Colorado 5.3L that came into the shop on a tow truck. The owner had spent a fortune at two other garages trying to solve an intermittent stalling issue. The truck would run fine for days, then suddenly die at a stoplight and refuse to restart for an hour. There were no consistent trouble codes, just a history of random communication faults. After confirming power and grounds to the ECM were solid, we suspected an internal thermal failure. We installed one of these pre-programmed modules, and the problem vanished instantly. The owner was thrilled to have his reliable truck back after months of guesswork.
A Straightforward Guide to Installation
Replacing the 2010-2012 Colorado ECM is a job most DIYers can handle with basic hand tools. Since this unit comes pre-programmed, no special scan tools are needed for the core installation. Just follow these simple steps.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On the Colorado and Canyon, the ECM is typically mounted on the right-hand (passenger side) firewall in the engine bay.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In most cases, you’ll need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new ECM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 12678513 and 12633264. It is guaranteed to fit and function correctly on the following vehicles with the specified options. Please provide your VIN upon purchase to ensure perfect programming.
- ✔ 2010-2012 Chevrolet Colorado (5.3L Engine)
- ✔ 2010-2012 GMC Canyon (5.3L Engine)
- ✔ 2010 Hummer H3 (5.3L Engine)
- ✔ 2012-2015 Chevrolet Camaro (6.2L, VIN P LSA)
- ✔ 2012 Chevrolet Camaro (3.6L or 6.2L, ID 12633264)
- ✔ 2010-2013 Cadillac CTS (6.2L Engine)
- ✔ 2014-2015 Cadillac CTS (Coupe, Sedan, or Wagon with 6.2L)
- ✔ 2010-2013 Chevrolet Corvette (6.2L, VIN R or T, LS9)
- ✔ 2010-2012 Chevrolet Malibu (3.6L Engine)
How does the VIN programming work?
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest GM software for your specific vehicle configuration. We then flash this software onto the ECM, making it a perfect match for your truck before it even leaves our facility.
Is this a true plug-and-play installation?
Yes, for over 95% of vehicles. Because it’s pre-programmed to your VIN, you will not need a trip to the dealer for software flashing. In some cases, a simple ‘Security Relearn’ procedure, which you can do yourself in your driveway, is required to sync the module with your keys. We include instructions for this easy process.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original ECM (like codes P0601 or P0606), then yes, this part is the correct fix. However, if the light is on for another reason, like a bad oxygen sensor or a loose gas cap, you will still need to address that separate issue.
Do I need to send my old ECM back?
No core charge or return is required for this part. You can keep or responsibly recycle your old module.
Is this compatible with other part numbers?
Yes, this ECM with service number 12678513 is fully interchangeable with service number 12633264. It is a direct replacement.