Restore Your Vehicle’s Core Performance and Reliability
Is your 2017 GMC Acadia or other GM vehicle suffering from frustrating issues like a persistent check engine light, sudden stalling, poor fuel mileage, or a no-start condition? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as your vehicle’s brain. Driving with a faulty ECM can be unpredictable and unsafe. This direct-fit replacement ECM, part number 12666070, is the definitive solution to get your vehicle running smoothly and efficiently again.
The biggest challenge with replacing an ECM is the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. Before we ship your part, our team of experienced technicians will program it with the latest GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward installation, saving you hundreds of dollars and significant downtime.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2017 Chevy Traverse that came into my shop with a truly baffling set of symptoms. The owner complained of random stalling at stoplights and harsh, unpredictable transmission shifts. We checked the transmission fluid, sensors, and wiring—everything looked perfect. No transmission codes were stored, but we did have a generic P0606 (ECM/PCM Processor Fault) that would pop up intermittently. After hours of chasing what we thought was a transmission issue, we focused on the ECM. Even though it wasn’t failing consistently, the internal processor was corrupted. Swapping in a properly programmed ECM like this one instantly solved both the stalling and the shifting problems. It’s a reminder that the ECM controls more than just the engine, and a faulty one can create ghost symptoms all over the vehicle.
Is Your Vehicle Showing These ECM Failure Signs?
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0602, P0606, or U0100
- ✔ Engine stalling, sputtering, or misfiring for no apparent reason
- ✔ Complete no-start condition where the engine cranks but won’t fire up
- ✔ Noticeable decrease in fuel economy
- ✔ Erratic or harsh automatic transmission shifting
- ✔ Communication issues with diagnostic scan tools
A Straightforward Guide to Installation
Installing your pre-programmed 2017 Acadia ECM is a manageable job for a confident DIYer or any professional mechanic. While specific locations vary slightly by model, the general process is the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all systems to power down.
- Locate the ECM: On many of these vehicles, including the Acadia, Traverse, and Enclave, the ECM is located behind the fan shroud in the engine bay. On others, like the Regal or Equinox, it’s on the driver’s side (LH) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab that needs to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new ECM into place and securely reconnect all electrical connectors. Ensure they click into place to confirm a solid connection.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple key-cycle security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times before starting the engine. Consult your owner’s manual for the exact procedure for your model.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit the following makes and models:
- 2017 Acadia: With VIN J (11th digit, Limited option), located behind the fan shroud
- 2017 Caprice: With 3.6L engine
- 2017 Traverse: Located behind the fan shroud
- 2017-2019 XTS: With 3.6L engine (VIN 3, 8th digit, opt LFX)
- 2017 Enclave: Located behind the fan shroud
- 2017 Regal: Located in the LH engine compartment
- 2017 Verano
- 2017-2019 Impala
- 2017 Equinox: Located in the LH engine compartment
- 2017 Terrain: Located in the LH engine compartment
Frequently Asked Questions
What does ‘VIN Programmed’ mean for my 2017 Acadia ECM?
It means we load the module with the specific software and calibrations for your exact vehicle using the VIN you provide. This ensures it communicates perfectly with your car’s other systems, just like one from the factory, without needing a trip to the dealer for programming.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set are all you need to physically swap the module. The programming is already done for you.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship the part until we receive this information to ensure correct programming.
My original part number is 12667002. Will this part work?
Yes. This ECM is a direct, interchangeable replacement for part numbers 12667002, 12666070, and 12667189. As long as your vehicle is on our compatibility list, this part will function correctly.
Will this fix my check engine light?
If the check engine light is caused by a failing ECM (common codes P0601-P0606), then this replacement module will solve the problem. However, you should always ensure other potential causes have been properly diagnosed by a qualified technician.