Restore Your GM Vehicle’s Core Performance and Reliability
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable truck into a source of constant frustration. Random stalling, a persistent Check Engine Light, and erratic engine behavior aren’t just annoying—they’re signs that your vehicle’s brain is struggling. This replacement ECM is the definitive solution for your 2015-2016 GMC Canyon and a wide range of other GM vehicles, designed to restore factory performance and get you back on the road with confidence.
What makes this module different? We take the guesswork and extra expense out of the equation. Before this part ever ships, we professionally program it with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This means you get a part that’s truly plug-and-play, eliminating the need for a costly trip to the dealership for programming. It’s the same reliable fix we’d perform in our own shop, delivered directly to you.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2015 Silverado that came into the shop with a laundry list of confusing symptoms. The owner had already replaced the spark plugs and a few sensors trying to chase down a rough idle and what he described as ‘hesitant’ transmission shifts. The scan tool showed a few intermittent misfire codes and a U0100 ‘Lost Communication’ code that would come and go. After checking the wiring harnesses and grounds—which is always step one—we focused on the ECM. A failing module can send faulty signals to other components, creating ghost problems that aren’t really there. Swapping in a properly programmed ECM, like this one, solved everything instantly. The engine smoothed out, the transmission shifted perfectly, and all communication codes vanished. It’s a classic case of the central computer causing system-wide issues.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Check Engine Light is on with codes like P0601, P0606, or various communication (U-series) codes.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or unstable idling.
- ✔ Engine stalling or hesitating during acceleration.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Installing your new 2015-2016 Canyon ECM is a manageable job for a confident DIYer. For the Canyon/Colorado, the ECM is typically located on the right-hand (passenger side) firewall in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow the system to fully discharge.
- Locate the ECM: Open the hood and find the module on the passenger-side firewall. It will have several large electrical connectors attached.
- Disconnect Connectors: Carefully release the locking tabs on each electrical harness connector and pull them straight out. Avoid pulling on the wires themselves.
- Remove Mounting Bolts: Use a socket wrench to remove the bolts or nuts holding the ECM bracket to the firewall.
- Install the New Module: Mount the new ECM in the same location, securing it with the original hardware.
- Reconnect Everything: Plug the electrical connectors back into the new module until they click securely in place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security or anti-theft relearn procedure may be required. This can often be done without special tools by cycling the key. Consult your vehicle’s service information for specific steps if needed.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12663391 and is compatible with a wide array of GM cars, trucks, and SUVs. Please verify your vehicle is on this list. It is a match for the following part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12672963, 12669318.
COLORADO 15-16 Electronic Control Module; (RH firewall), 3.6L
SILVERADO 1500 PICKUP 14-16 (Multiple IDs)
SIERRA 1500 PICKUP 14-16 (Multiple IDs)
SIERRA DENALI 1500 14-16
TAHOE 15-16
SUBURBAN 1500 15-16
YUKON & YUKON XL 1500 15-16
ESCALADE & ESCALADE ESV 15-16
CORVETTE 14-16
CAMARO 16 6.2L
ATS 14-16 3.6L
CTS 14-16 3.6L & 6.2L
XTS 14-16 3.6L
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and calibrations for your exact vehicle using your 17-digit Vehicle Identification Number (VIN). This ensures perfect compatibility with your engine, transmission, and other options, just like a new part from the dealer, but without the extra cost and hassle.
How do I provide my VIN?
After you complete your purchase, you will need to send us your vehicle’s VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship the module until we receive this information.
Do I need to do any other programming after installation?
In most cases, no. The core engine and transmission programming is complete. Some GM vehicles may require a simple ‘Security Relearn’ or ‘Crankshaft Position Variation Relearn’ procedure, which can often be done without a scan tool. We recommend checking your vehicle’s service manual for specifics.
Is this a brand new part?
This is a high-quality, tested, and verified used OEM component. Each module is thoroughly inspected and confirmed to be fully functional before being programmed with the latest GM software for your vehicle. This provides a reliable and cost-effective solution.