Restore Your GM Vehicle’s Core Performance and Reliability
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a dependable vehicle into a source of constant frustration. If your 2017 Chevrolet Traverse or other compatible GM model is suffering from a persistent check engine light, erratic performance, stalling, or poor fuel economy, you’ve likely pinpointed the culprit. This isn’t just a part; it’s the brain of your engine’s operation, and getting it right is critical. This module, part number 12667189, is the definitive solution to restore your vehicle’s factory performance and peace of mind.
We take the guesswork and hassle out of the replacement process. Unlike sourcing a module from a salvage yard, which comes with an unknown history and requires expensive dealer programming, this unit arrives at your door ready for installation. Simply provide us with your vehicle’s VIN during checkout, and our experts will flash the module with the latest, most stable GM-certified software specific to your car. This ensures seamless communication between all vehicle systems and corrects common issues that older software versions may have had. A properly functioning 2017 Traverse ECM is essential for everything from ignition timing and fuel delivery to transmission shifting and emissions control.
From the Diagnostic Bay
I remember a 2017 Acadia that came into the shop with a complaint of intermittent stalling at stoplights and a whole array of communication codes (U-codes) that didn’t point to a single sensor. The owner had already replaced the throttle body and a camshaft sensor with no luck. After verifying all power and ground circuits to the ECM were solid, we knew where to look. The original ECM was failing internally, causing network-wide disruptions. Installing a VIN-programmed module like this one resolved all the codes and the stalling issue in one shot. It saved the customer from chasing down more phantom problems and got their family vehicle safely back on the road.
Common Signs of a Failing Engine Computer
A faulty ECM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer is a likely suspect:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal processor failure, such as P0601, P0602, P0606.
- ✔ Network communication codes like U0100 (Lost Communication with ECM/PCM).
- ✔ Unexplained drops in fuel efficiency.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start (no-start condition).
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Replacing the ECM on these GM models is a manageable job for a DIY enthusiast or any professional mechanic. While specific steps may vary slightly by model, here is a general guide to get you started.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow capacitors to discharge before beginning any work on the electrical system.
- Locate the ECM: On the Traverse, Acadia, and Enclave, the ECM is typically located behind the cooling fan shroud. On other models like the Regal or Equinox, it’s often found in the engine compartment on the driver’s side. Refer to a service manual for your specific vehicle if unsure.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Never force them. Inspect the pins for any signs of corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you will need it to install the new unit.
- Install the New ECM: Mount your new, pre-programmed module in place and secure it with the original hardware. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Check your owner’s manual for specific instructions.
- Final Check: Start the engine and check for a smooth idle and ensure the check engine light is off. Take the vehicle for a test drive to confirm all issues are resolved.
Verified Vehicle Compatibility
This ECM is a direct-fit replacement for several GM vehicles and part numbers, including 12667002, 12666070, and 12667189. Please verify your model and options below:
- 2017 Chevrolet Traverse: Electronic Control Module (behind fan shroud)
- 2017 Chevrolet Caprice: Electronic Control Module; 3.6L
- 2017-2019 Chevrolet Impala: Electronic Control Module
- 2017 Chevrolet Equinox: Electronic Control Module (LH engine compartment)
- 2017 GMC Terrain: Electronic Control Module (LH engine compartment)
- 2017 GMC Acadia: Electronic Control Module; VIN J (11th digit, Limited), (behind fan shroud)
- 2017 Buick Enclave: Electronic Control Module (behind fan shroud)
- 2017 Buick Regal: Electronic Control Module (LH engine compartment)
- 2017 Buick Verano: Electronic Control Module
- 2017-2019 Cadillac XTS: Electronic Control Module; 3.6L, VIN 3 (8th digit, opt LFX)
Frequently Asked Questions
Do I need to do any programming after I receive this 2017 Traverse ECM?
No. We flash the module with your vehicle’s specific VIN and the latest GM software before shipping. In most cases, it is a plug-and-play installation, though some models may require a simple security relearn procedure that you can do yourself.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it.
Is this compatible with other part numbers?
Yes, this ECM is a direct replacement for part numbers 12667002, 12666070, and 12667189. If your original module has one of these numbers, this part will work for you.
What if I install it and my problem doesn’t go away?
While this ECM fixes the listed symptoms, it’s crucial to ensure your vehicle has been properly diagnosed. Problems with wiring, grounds, or other sensors can sometimes mimic ECM failure. We recommend confirming the diagnosis before purchase.
Will this fix my transmission problems?
In many modern vehicles, the ECM plays a significant role in controlling transmission functions. If your transmission issues are caused by faulty signals from the engine computer, then replacing the ECM can resolve them. However, it will not fix internal mechanical failures within the transmission itself.