Is Your 2015-2016 Colorado Running Rough or Not Starting at All?
If your Chevy Colorado is suddenly plagued by a check engine light, erratic engine behavior, stalling, or a frustrating no-start condition, the problem might be deeper than a simple sensor. As the brain of your truck’s powertrain, the Engine Control Module (ECM) is responsible for thousands of calculations per second. When it fails, it can create a cascade of confusing and seemingly unrelated issues. In my 20+ years of diagnostics, I’ve seen how a faulty ECM can send even experienced mechanics on a wild goose chase, replacing perfectly good parts.
From the Shop Floor: A Real-World Diagnostic Story
A customer’s 2015 Colorado came into the shop last week with these exact symptoms. It was misfiring badly, the transmission was shifting hard, and the dash was lit up with codes for the O2 sensors, camshaft position, and even a U-code for lost communication. The owner had already replaced plugs and a coil pack with no improvement. After verifying the wiring harness was intact and power/grounds to the module were solid, my advanced scan tool confirmed our suspicion: the ECM itself was failing internally, corrupting data and sending faulty commands. It’s a classic failure mode I’ve diagnosed hundreds of times, often caused by years of heat cycles and engine vibration.
The Dealership-Free Solution: A VIN-Programmed ECM
Replacing the ECM used to mean towing your truck to a dealer, paying for the expensive module, and then paying several hundred more for them to program it. Our solution eliminates that hassle and cost. This is a genuine GM Engine Control Module that we program specifically for your vehicle before we ship it out. You’re not just getting a part; you’re getting a fully prepared, plug-and-play solution.
How Our Programming Service Works for You
When you purchase this module, you simply provide us with your vehicle’s 17-digit VIN. We use that information to connect to GM’s official software database and flash the module with the latest, most stable calibration available for your specific 2015-2016 Colorado. This ensures perfect compatibility with your engine, transmission, and all factory options.
- ✔ Solves Common Failure Symptoms: If you’re experiencing any of the issues below, a faulty ECM is a highly likely cause.
- ✔ No Additional Programming Needed: This module arrives ready for installation. In most cases, it’s a direct swap that restores your truck’s performance immediately.
- ✔ Loaded with GM Updates: We install the newest software from General Motors, which can resolve drivability issues that might have existed even with your old module.
- ✔ Saves Time and Money: Avoid the tow truck, dealership wait times, and their high labor rates for programming.
Common Symptoms of a Failing Colorado ECM:
- ✔ Check Engine Light (CEL) is on with various trouble codes
- ✔ Engine cranks but will not start
- ✔ Rough or unstable idle
- ✔ Stalling or hesitation during acceleration
- ✔ Noticeable decrease in fuel economy
- ✔ Communication errors with scan tools
- ✔ Seemingly random warning lights on the instrument cluster
Installation and Compatibility
On the 2015-2016 Colorado and Canyon, the ECM is typically located on the right-hand (passenger side) firewall in the engine bay. Physical installation is straightforward for anyone with basic mechanical skills. Please be aware that after installation, some GM vehicles may require a Security Relearn or Crankshaft Position Variation Relearn procedure, which can be completed with a capable bi-directional scan tool. This part, 12663391, is a direct replacement for several other service numbers, ensuring wide compatibility. Please verify your part number against the list below or contact us with your VIN if you are unsure.
This module is a direct replacement for part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318.