Is your 2017 Chevrolet Traverse or other GM vehicle suddenly running rough, stalling, or refusing to start? A faulty Engine Control Module (ECM) is often the culprit, acting like a confused brain for your engine. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. We provide a dependable, direct-fit solution: a replacement ECM, part number 12666070, that arrives at your door programmed and ready for installation.
The biggest headache with ECM replacement is the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures your vehicle operates exactly as the manufacturer intended, often resolving issues that the original software didn’t. This is the most efficient way to restore your vehicle’s performance and reliability.
Case Study: A Tricky Diagnosis
A few months back, a 2017 Acadia came into the shop with a frustratingly intermittent issue. The owner complained of random stalling at stoplights and a persistent Check Engine Light with a P0606 code (ECM Processor Fault). We checked all the usual suspects—wiring, grounds, sensors—and everything looked perfect. The problem would disappear for days, only to return without warning. Based on experience, I suspected the ECM was failing internally under specific thermal conditions. We swapped in one of our pre-programmed modules, and the customer called a week later to say the vehicle had never run better. The stalling was gone for good. It’s a classic example of how a failing computer can mimic a dozen other problems.
Common Signs of a Failing Engine Computer
If the central computer of your vehicle is failing, you may experience a wide range of symptoms. Here are some of the most common indicators that your ECM needs attention:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other communication errors.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Transmission shifting issues or harsh engagement.
- ✔ Inconsistent or rough idling.
A Straightforward Guide to Installation
Installing your new 2017 Traverse ECM is a manageable job for a DIYer with basic tools. Always consult a vehicle-specific repair manual, but 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 15 minutes for the system capacitors to discharge.
- Locate the Module: On the 2017 Traverse, the ECM is typically located behind the cooling fan shroud. On other models like the Regal or Equinox, it’s often in the LH (driver’s side) engine compartment.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid damaging the pins or the connectors.
- Remove the Old ECM: Unbolt the mounting hardware holding the old module in place and remove it from the vehicle.
- Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Most GM vehicles require a security or anti-theft relearn procedure after ECM replacement. This can typically be done without special tools by cycling the key in the ignition. A common method is: Turn the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeat this two more times for a total of 30 minutes. The vehicle should then start.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit the following vehicles and options:
- 2017 Cadillac XTS (with 3.6L, VIN 3)
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Traverse (located behind fan shroud)
- 2017 Chevrolet Equinox (located in LH engine compartment)
- 2017 Chevrolet Caprice (with 3.6L)
- 2017 Buick Regal (located in LH engine compartment)
- 2017 Buick Enclave (located behind fan shroud)
- 2017 Buick Verano
- 2017 GMC Acadia (Limited models, VIN J)
- 2017 GMC Terrain (located in LH engine compartment)
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. This is the primary benefit of our service. We program the module to your car’s specific VIN before shipping it, so it’s ready for installation right out of the box. This saves you time and the high cost of dealership programming.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your car. It contains critical information about your vehicle’s make, model, engine, and factory options. We use it to load the exact correct GM software onto the ECM for perfect compatibility.
Where is the ECM located on a 2017 Traverse?
On the 2017 Chevrolet Traverse, the Engine Control Module is mounted behind the engine’s cooling fan shroud, which is at the front of the engine bay against the radiator.
Will this part fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes include P0601-P0606), then replacing it with this module should resolve the issue. However, you must first ensure that the code is not being caused by a faulty sensor or wiring problem elsewhere in the vehicle.
Is any other setup required after installation?
Yes, after installing the ECM and reconnecting the battery, you will need to perform a security relearn procedure. This process pairs the new ECM to your vehicle’s anti-theft system and can usually be done in your driveway without any special scan tools.