Programmed 2015-2016 Colorado ECM | 12656993 Engine Control Module

Restore Your Truck’s Core Performance and Reliability

Is your 2015-2016 Chevy Colorado or GMC Canyon running rough, stalling unexpectedly, or throwing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times. Often, the culprit isn’t a simple sensor but the very brain of your engine: the Engine Control Module (ECM). A failing ECM can cause a cascade of frustrating problems, from poor fuel economy and erratic shifting to a complete no-start condition, leaving you stranded. Don’t let a faulty computer dictate your truck’s health.

This isn’t just a replacement part; it’s a complete solution. We provide a genuine GM Engine Control Module, part number 12656993, that arrives at your doorstep fully programmed to your specific vehicle. Using your truck’s Vehicle Identification Number (VIN), we flash the module with the latest, most stable software updates directly from GM. This critical step ensures seamless communication with all other vehicle systems and eliminates the need for an expensive trip to the dealership for programming. You get a reliable, plug-and-play fix that restores your engine’s intended performance and efficiency.

Is Your Truck Showing These Symptoms?

• ✔ Check Engine Light is on with codes like P0601, P0606, or other U-series communication codes.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drops in fuel economy.
• ✔ The engine stalls, stumbles, or misfires intermittently.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Loss of communication with your scan tool.
• ✔ Other warning lights (ABS, Traction Control) illuminating without a clear cause.

A Straightforward Guide to Installation

Replacing the ECM on your Colorado or Canyon is a manageable job for a DIYer with basic tools. The key is taking your time and following the proper procedure. This 2015-2016 Colorado ECM is designed for a direct fit.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
2. Locate the ECM: On the 2015-2016 Colorado/Canyon, the ECM is typically mounted on the right-hand side (passenger side) of the firewall in the engine bay.
3. Disconnect Connectors: Carefully release the locking tabs and disconnect all electrical wiring harness connectors from the old module. Inspect the connectors for any corrosion or damage.
4. Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to the firewall. Remove the old module from the vehicle.
5. Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
6. Reconnect Everything: Firmly plug the wiring harness connectors into the new ECM until they click into place. Reconnect the negative battery terminal.
7. Perform Security Relearn: This is a vital step. You will need to perform the vehicle’s anti-theft security relearn procedure. This can typically be done without special tools by cycling the key in the ignition. A quick search for your specific model’s “VATS relearn procedure” will provide the exact steps. This syncs the new ECM with your vehicle’s security system.

Will This Fit My Vehicle?

This module is a direct replacement for part number 12656993 and is compatible with a wide range of GM vehicles. Please verify your part number or match your vehicle from the list below. Remember to provide your VIN upon purchase for correct programming.