If your 2015-2016 GMC Canyon or other compatible GM vehicle is suddenly running poorly, stalling, or showing a persistent check engine light, a failing Engine Control Module (ECM) is a likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just a part; it’s the brain of your engine, and when it falters, your vehicle’s reliability is gone. We offer a direct, dependable solution: a genuine GM Engine Control Module, part number 12662034, delivered to your door already programmed with the latest GM software for your specific vehicle.
Case Study: The Ghost in the Machine
I remember a 2015 GMC Canyon that came into my shop with a complaint that stumped two other mechanics. The owner described random stalling at stoplights, erratic shifting, and a check engine light that would come and go. Scans showed a mix of communication codes (U0100) and intermittent sensor faults. Instead of just throwing parts at it, we monitored the live data stream from the ECM. We noticed the processor would occasionally ‘hiccup,’ dropping data for a split second—just long enough to cause a problem but not always long enough to set a hard fault. This pointed directly to an internal ECM failure. Replacing the module with a pre-programmed unit like this one solved every single issue instantly. This is why getting a quality, correctly programmed module is critical—it avoids the guesswork and gets the job done right the first time.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0606 (Internal Control Module Processor Error), or various communication codes (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ The vehicle stalls unexpectedly or runs rough.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Failure to pass an emissions test.
This module provides a direct path to resolving these problems. By providing us with your Vehicle Identification Number (VIN) during checkout, our experts will flash the module with the most current, stable software from General Motors. This ensures it communicates perfectly with your vehicle’s other systems, restoring original performance and efficiency without a costly trip to the dealership for programming.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- ✔ Locate the ECM: On the 2015-2016 Canyon and Colorado, the ECM is typically located on the passenger side firewall in the engine compartment. For other GM models, it may be in the front-left of the engine bay.
- ✔ Disconnect Connectors: Carefully release the locking tabs and disconnect all electrical wiring harnesses from the old ECM. Inspect the connectors for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses firmly back into the new ECM until they click into place. Reconnect the negative battery terminal.
- ✔ Final Steps: Some vehicles may require a security relearn procedure, which can often be done without special tools (e.g., turning the key to ‘On’ for 10-15 minutes). Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This ECM is a direct fit for a wide range of GM vehicles. Please verify your part number or match your vehicle from the list below. This module is a compatible replacement for part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318.
ATS (2014-2016, 3.6L)
CAMARO (2016, 6.2L)
CANYON (2015-2016, 3.6L)
COLORADO (2015-2016, 3.6L)
CORVETTE (2014-2016)
CTS (2014-2016, 3.6L & 6.2L)
ESCALADE / ESV (2015-2016)
SIERRA 1500 / DENALI 1500 (2014-2016)
SILVERADO 1500 (2014-2016)
SUBURBAN 1500 (2015-2016)
TAHOE (2015-2016)
YUKON / XL 1500 (2015-2016)
XTS (2014-2016, 3.6L)
Note: For some trucks, please match the ID on your original module (e.g., 12662034, 12672537, 12673195).
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the ECM with the exact software and calibrations your specific vehicle requires. This ensures seamless integration with your engine, transmission, and security systems, making the installation plug-and-play.
Is this a difficult part to install myself?
For someone with basic mechanical skills, this is a very manageable job. The most important steps are disconnecting the battery and carefully swapping the electrical connectors. Since we handle the programming, you avoid the most complex part of the process.
Will I need to do anything else after installation?
In most cases, no. The module arrives ready to install. Some GM vehicles may require a simple security relearn procedure, which typically involves leaving the key in the ‘on’ position for about 10-15 minutes before starting. Instructions are readily available online for your specific model.
Is this part new or used?
This is a high-quality, inspected, and tested used OEM part that has been verified to be fully functional before being programmed with fresh GM software for your vehicle.
What if my part number isn’t an exact match to 12662034?
This module is a hardware equivalent for several part numbers listed in the description. As long as your original part number is in our compatible list, this module will function correctly once programmed to your VIN.