Restore Peak Performance to Your 2017 GMC Terrain
Is your 2017 GMC Terrain experiencing perplexing issues like stalling, poor fuel economy, a persistent check engine light, or even a no-start condition? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit behind these frustrating problems. It governs everything from fuel mixture and ignition timing to transmission shifts and emissions control. When it fails, the entire vehicle’s performance and reliability are compromised. This replacement ECM, part number 12667002, is the definitive solution to get your vehicle running like new again.
This is not just a generic, off-the-shelf part. We provide a fully programmed solution tailored specifically to your vehicle. Upon purchase, you will provide us with your Vehicle Identification Number (VIN). Our expert technicians will then flash the module with the latest, most stable GM-certified software for your exact make, model, and factory options. This critical step ensures seamless integration, eliminating the need for an expensive trip to the dealership for programming. It’s designed to be a direct-fit replacement, restoring the precise operational parameters your engine was designed for.
From the Diagnostic Bay
We had a 2017 Chevy Equinox (which uses the same ECM) come into the shop with a maddeningly intermittent stalling issue. The owner had replaced the battery, alternator, and multiple sensors, but the vehicle would still randomly die at stoplights with no warning and no stored trouble codes. After hours of live data monitoring, we noticed the 5-volt reference signal from the ECM would momentarily drop out, causing the crankshaft and camshaft sensors to lose their readings. This pointed to an internal failure in the original ECM. We installed one of our VIN-programmed modules, performed the security relearn, and the stalling problem was completely gone. It’s a classic example of how a failing ECM can create phantom issues that are nearly impossible to trace without replacing the unit itself.
Is Your 2017 Terrain ECM Failing?
A faulty Engine Control Module can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your ECM may be the root cause:
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication (U-codes), sensor circuits, or processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially as it warms up.
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector or ignition coil command from the ECM.
- ✔ Poor Performance & Fuel Economy: A noticeable drop in power, hesitation during acceleration, and a significant decrease in MPG.
- ✔ Transmission Issues: Harsh or erratic shifting, as the ECM plays a vital role in communicating with the Transmission Control Module (TCM).
- ✔ Intermittent Electrical Problems: Seemingly random issues that come and go, which can be a sign of an internal short or failing processor in the module.
A Simple, Reliable Solution
Replacing your 2017 Terrain ECM doesn’t have to be a complicated or costly ordeal. Our process is designed for the everyday vehicle owner and the professional mechanic alike. By programming the module to your VIN before shipping, we handle the most complex part of the job. Installation is straightforward: disconnect the battery, locate the old module in the left-hand (driver’s side) engine compartment, unplug the electrical connectors, unbolt it, and install the new one in its place. After installation, a simple security relearn procedure (often called a key-cycle relearn) is required to sync the new ECM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require any special tools.
Broad GM Compatibility
This module is a direct replacement for multiple part numbers, including 12667002, 12666070, and 12667189. It also fits a wide range of other 2017-2019 GM vehicles, ensuring a high-quality, tested component for your repair. Compatible models include:
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse
- 2017-2019 Cadillac XTS (3.6L, LFX)
- 2017 GMC Acadia (Limited)
- 2017 Buick Enclave
- 2017 Buick Regal
- 2017 Buick Verano
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Equinox
- 2017 GMC Terrain
Frequently Asked Questions
Is this ECM truly plug-and-play?
Almost! It comes pre-programmed to your vehicle’s VIN. After you install it, you will need to perform a simple security relearn procedure, which involves a series of key cycles. This syncs the new ECM to your vehicle’s anti-theft system and can be done in your driveway without any special tools. Instructions are readily available online for your specific model.
How do I provide my VIN number?
You can enter your VIN in the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship the module until we have your VIN to ensure correct programming.
Why is VIN programming so important?
Your VIN tells the ECM everything about your vehicle’s specific configuration—engine type, transmission, emissions systems, and other factory options. Programming ensures the module operates exactly as the original did, preventing compatibility errors, check engine lights, and performance issues.
Where is the ECM located on my 2017 Terrain?
On the 2017 GMC Terrain and Chevrolet Equinox, the Engine Control Module is typically located in the engine bay on the driver’s side (LH side), often near the fuse box or air filter housing.
Will this fix my specific problem?
If your vehicle’s issues have been correctly diagnosed as a faulty ECM, this part is the solution. However, since symptoms of a bad ECM can overlap with other failing parts (like sensors or wiring), we always recommend a thorough diagnosis by a qualified mechanic to confirm the ECM is the root cause before ordering.