Is Your GM Vehicle Plagued by Engine Troubles?
If your Acadia, Equinox, Malibu, or other compatible GM vehicle is experiencing frustrating issues like a persistent check engine light, poor acceleration, random stalling, or a complete no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your engine, its health is critical for performance, fuel economy, and emissions. When it fails, it can create a cascade of problems that are often misdiagnosed, costing you time and money on unnecessary parts.
The Smart, Reliable Solution: A VIN-Programmed ECM
Forget the exorbitant costs and scheduling hassles of a dealership. We offer a dependable, tested, genuine used GM ECM with service number 12669908. The real value is in our service: before this module ever ships, we program it with the latest official GM software calibrations specifically matched to your vehicle’s VIN. This ensures the computer is ready to communicate with the other modules in your car, restoring its original factory performance.
Expert Pro Tip: Check Your Connections First
In my 20+ years as a diagnostician, I’ve seen countless ECMs replaced when the real issue was a poor connection. Before you remove the old module, disconnect the battery, unplug the ECM connectors, and carefully inspect the pins on both the harness and the module itself. Look for any signs of corrosion (green or white powder), moisture, or bent pins. Cleaning them with a dedicated electronics cleaner and a small brush can sometimes solve the problem entirely. This simple 5-minute check can save you hundreds of dollars.
Symptoms of a Failing 2017-2021 Acadia ECM
While a proper scan tool diagnosis is always best, a faulty engine computer often reveals itself through a specific set of symptoms. If you’re noticing several of these, it’s a strong indicator that your ECM is the root cause:
- โ Persistent Check Engine Light (CEL) with various communication or processor-related codes.
- โ Vehicle refuses to start or cranks but won’t turn over.
- โ Noticeable drop in fuel efficiency for no apparent reason.
- โ Engine stumbles, misfires, or runs erratically.
- โ Automatic transmission shifts harshly or at the wrong times.
- โ Communication loss with your diagnostic scan tool.
Installation & Post-Installation Requirements
Installing your programmed ECM is straightforward. However, modern vehicles have sophisticated anti-theft systems. Please read this section carefully, as these final steps are the responsibility of the buyer or their installer.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On most listed models, the ECM is found in the engine compartment, often near the battery or firewall.
- Swap the Modules: Carefully unplug the wiring harnesses from your old ECM and unbolt it. Mount the new module in its place and securely reconnect the harnesses.
- Reconnect Battery: Re-attach the negative battery terminal.
- CRITICAL: Vehicle Theft Deterrent System (VTDS) Relearn: After installation, your vehicle’s security system will not recognize the new ECM, and it will likely not start. A VTDS relearn procedure must be performed. This requires a professional-grade scan tool with access to GM’s TIS2Web programming service. Most independent repair shops are equipped to do this.
- Additional Setups: Depending on your specific vehicle, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary to achieve optimal performance.
Guaranteed Fitment for Service Part #12669908
This module is a direct replacement for units with the service number 12669908. It is compatible with a wide range of GM vehicles. Please verify your part number and check the list below:
- Acadia: 2017 (VIN Z, 2.5L), 2018 (2.5L)
- ATS: 2017 (2.0L)
- CTS: 2017 (2.0L)
- Cruze: 2017-2018 (Gasoline)
- Equinox: 2018 (1.5L or 2.0L), 2019 (1.5L, ID 12669908)
- LaCrosse: 2018 (2.5L)
- Malibu: 2017, 2018 (1.8L or 2.0L)
- Regal: 2018 (2.0L)
- Volt: 2017-2018 (Gasoline, ID 12669908)
Please provide your VIN upon checkout in the ‘notes to seller’ section or send us a message. We cannot program and ship your part without it. Get your vehicle running right again with a reliable, professionally programmed engine computer.