Is Your 2017 GMC Terrain Running Rough?
If your Terrain is suddenly experiencing frustrating issues like a persistent Check Engine Light, poor fuel mileage, stalling, or a complete no-start condition, the problem often points directly to a failing Engine Control Module (ECM). As the central computer for your vehicle’s engine, a faulty ECM can disrupt everything from fuel injection and spark timing to transmission shifting, leaving you stranded and facing a costly trip to the dealership. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
The Direct-Fit, Programmed Solution You Need
This is a genuine GM Engine Control Module, part number 12667189, that arrives at your doorstep fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We handle the complex part for you. By flashing the module with the latest, most stable software updates directly from GM, we ensure it’s ready for immediate installation. This process eliminates the need for expensive dealer-only programming tools or appointments, saving you significant time and money.
Expert Pro Tip: Check Your Grounds First!
Before you replace your 2017 Terrain ECM, take 10 minutes to inspect and clean the main engine-to-chassis ground straps. On many GM vehicles, a corroded or loose ground connection can cause erratic voltage signals that mimic the symptoms of a failed ECM. I’ve seen this simple check save customers hundreds of dollars in my 20+ years on the shop floor. A clean, tight ground is essential for any electronic component to function correctly.
Common Symptoms of a Failing 2017 Terrain ECM:
- โ Persistent Check Engine Light (CEL) with various trouble codes
- โ Unexplained stalling or engine hesitation during acceleration
- โ Noticeable decrease in fuel economy
- โ Rough idling or misfires
- โ Vehicle entering ‘limp mode’ with reduced power
- โ Complete no-start or intermittent starting problems
- โ Communication errors with diagnostic scan tools
Plug-and-Play Installation: No Dealer Visit Required
Installing your new ECM is a straightforward process that a confident DIYer can handle. Because we program it beforehand, you can get your Terrain back to factory-spec performance right in your own driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2017 GMC Terrain, the ECM is typically found in the engine compartment on the driver’s side (LH).
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed ECM and securely reconnect the wiring harnesses. You should feel a distinct click as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal. The vehicle is now ready to start. While no further programming is needed, some vehicles may require a security relearn procedure, which can often be completed by cycling the key.
Guaranteed Compatibility
This module is a direct replacement for part number 12667189 and is also interchangeable with part numbers 12667002 and 12666070. It is guaranteed to fit the following vehicles:
- 2017 GMC Terrain (LH engine compartment)
- 2017 Chevrolet Equinox (LH engine compartment)
- 2017-2019 Chevrolet Impala
- 2017 Buick Verano
- 2017 Buick Regal (LH engine compartment)
- 2017 GMC Acadia (Limited, VIN J, behind fan shroud)
- 2017 Buick Enclave (behind fan shroud)
- 2017 Chevrolet Traverse (behind fan shroud)
- 2017-2019 Cadillac XTS (3.6L, VIN 3)
- 2017 Chevrolet Caprice (3.6L)
IMPORTANT: After placing your order, please provide us with your vehicle’s 17-digit VIN. We cannot ship your part until we have programmed it specifically for your Terrain.