Is Your GMC Terrain Running Rough, Stalling, or Showing a Check Engine Light?
As a diagnostic technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can cause a cascade of frustrating and hard-to-diagnose problems. From erratic idling and poor fuel economy to a complete no-start condition, the ECM is the brain of your engine, and when it falters, your vehicle’s reliability is compromised. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
The Direct Solution: A VIN-Programmed 2018-2020 Terrain ECM
This isn’t just a replacement part; it’s a fully integrated solution. We are offering a genuine, used GM Engine Control Module, service number 12669908, that we professionally program to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures the ECM has the correct software and calibrations straight from GM’s library, allowing it to communicate seamlessly with your Terrain’s other systems.
Key Benefits of This Programmed ECM:
- โ VIN-Specific Programming: We flash the module with the latest GM software updates using your VIN. This is not a generic, one-size-fits-all part.
- โ Cost-Effective Repair: Get a reliable, tested OEM part without the high cost of a new module from a dealership.
- โ Resolves Common Failures: Directly addresses symptoms like false sensor codes, intermittent stalling, harsh shifting, and persistent check engine lights.
- โ Broad Compatibility: While perfect for the Terrain, this module also fits a wide range of other GM vehicles (see full list below).
From My Bay to Your Driveway: A Real-World Scenario
“Just last month, a 2018 Chevy Equinox with the 1.5L engineโwhich uses this exact ECMโwas towed in. The owner had already replaced the fuel pump and a camshaft sensor trying to fix an intermittent no-start issue. After 15 minutes of checking network data, I saw the ECM was dropping communication randomly. We installed one of these VIN-programmed modules, performed the security relearn, and the vehicle fired up instantly and has run perfectly since. It saved the customer from spending hundreds more on unnecessary parts.”
Simple Ordering Process
- Purchase: Complete your order for the ECM.
- Provide VIN: Reply to your order confirmation email with your vehicle’s 17-digit VIN.
- We Program & Ship: Our technicians will program the module and ship it directly to you, ready for installation.
Installation & Setup Information
Installing the module is straightforward, but please be aware of the final setup steps required for your vehicle’s security system. This is a standard procedure for modern GM vehicles to prevent theft.
IMPORTANT NOTICE: Upon installation, your vehicle may not start until a Vehicle Theft Deterrent (VTD) Relearn is performed. This procedure pairs the new ECM to your vehicle’s immobilizer system. This must be done using a professional scan tool with access to GM’s TIS2Web programming system. Additionally, other procedures like a Crankshaft Variation Relearn or injector flow rate programming may be necessary depending on your specific vehicle and engine. This is the responsibility of the installer. We provide the correctly programmed part; the final on-vehicle setup must be completed by you or your mechanic.
Expert Pro Tip: Connector Inspection
Before plugging in your new ECM, take a moment to closely inspect the vehicle’s harness connectors. Use a flashlight to check for any green or white corrosion, moisture, or bent pins. Over the years, I’ve seen countless jobs where a perfectly good module failed to work simply because of a poor connection. Cleaning the terminals with a dedicated electronic contact cleaner can prevent a world of headaches.
Guaranteed Fitment for Service Number 12669908
This module is a confirmed fit for the following vehicles and options. Please match your service number to ensure compatibility.
- ACADIA 2017 (VIN Z, 11th digit), 2.5L
- ACADIA 2018, 2.5L
- ATS 2017, 2.0L
- CTS 2017, 2.0L
- CRUZE 2017-2018, gasoline
- EQUINOX 2018, 1.5L
- EQUINOX 2018, 2.0L
- EQUINOX 2019, 1.5L (ID 12669908)
- LACROSSE 2018, 2.5L
- MALIBU 2017, (LH engine compartment)
- MALIBU 2018, 1.8L
- MALIBU 2018, 2.0L
- REGAL 2018, 2.0L
- VOLT 2017-2018, gasoline