Is Your 2017 GMC Terrain Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating issues like a persistent Check Engine Light, poor fuel economy, engine stalling, or a complete no-start condition in your 2017 GMC Terrain, a failing Engine Control Module (ECM) is a very likely cause. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose, leading to costly and ineffective repairs.
Don’t let a faulty computer keep you off the road. This genuine GM Engine Control Module, part number 12667189, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork and hassle out of the replacement process by pre-programming the module specifically for your vehicle using the VIN you provide. This means no expensive trips to the dealership for programming—it arrives at your door ready for a straightforward installation.
From the Diagnostic Bay
We recently had a 2017 Equinox (which shares its platform with the Terrain) come into the shop with a bizarre issue. The owner complained of intermittent stalling at stoplights and a transmission that seemed to shift harshly for no reason. Multiple shops had replaced sensors and even the throttle body, but the problem persisted. After hooking up our diagnostic scanner, we noticed erratic data streams from the ECM. The voltage references were fluctuating just enough to confuse other modules, but not enough to set a specific ‘bad ECM’ code. By installing a new, correctly programmed ECM, all the phantom issues disappeared. It’s a classic example of how a failing central computer can send you chasing ghosts all over the vehicle.
Common Symptoms of a Failing 2017 Terrain ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Rough or erratic idling.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Loss of power and poor overall engine performance.
The Plug-and-Play Advantage: A Programmed Solution
The most significant challenge when replacing a modern vehicle’s computer is the programming. An unprogrammed module simply will not work. It needs to be coded with your vehicle’s specific Vehicle Identification Number (VIN) and equipped with the latest software updates from GM to communicate correctly with all other systems. Our service eliminates this critical and often costly step. By providing us with your VIN during checkout, you receive a 2017 Terrain ECM that is fully prepared for your vehicle. This ensures seamless integration and optimal performance right out of the box.
Guaranteed Vehicle Compatibility
This Engine Control Module is a direct-fit replacement for part number 12667189 and is also compatible with interchangeable part numbers 12667002 and 12666070. It is guaranteed to fit the following makes and models:
- 2017 GMC Terrain (LH engine compartment)
- 2017 Chevrolet Equinox (LH engine compartment)
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse (behind fan shroud)
- 2017-2019 Cadillac XTS (3.6L, VIN 3, opt LFX)
- 2017 GMC Acadia (VIN J, Limited, behind fan shroud)
- 2017 Buick Enclave (behind fan shroud)
- 2017 Buick Regal (LH engine compartment)
- 2017 Buick Verano
- 2017-2019 Chevrolet Impala
Please verify your part number and vehicle fitment before ordering to ensure a perfect match. If you have any questions about compatibility, our expert team is here to help.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. This is the primary benefit of our service. We program the ECM with the latest GM software using the VIN you provide. It will arrive ready to install, saving you time and the high cost of dealership programming.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your insurance and registration documents.
Where is the ECM located on my 2017 GMC Terrain?
On the 2017 GMC Terrain and Chevrolet Equinox, the Engine Control Module is typically located in the engine compartment on the driver’s side (LH). Always disconnect the vehicle’s battery before attempting to remove or install any electronic modules.
Will this fix my check engine light?
If the check engine light and other symptoms are being caused by a faulty ECM, then yes, this replacement part will resolve those issues. However, it’s always recommended to have a proper diagnosis performed to confirm the ECM is the root cause before ordering.
Is any additional setup required after installation?
In some cases, a security relearn or crank position sensor relearn procedure may be necessary after installation. These are simple procedures that can often be done without special tools. Instructions can be readily found online or in a service manual for your specific vehicle.