Restore Peak Performance to Your GM Vehicle
Is your 2017 Chevrolet Traverse running rough, stalling unexpectedly, or flashing a persistent Check Engine Light? These frustrating and often confusing issues frequently point to a failing Engine Control Module (ECM), the central computer of your vehicle. When the ECM malfunctions, it can disrupt everything from fuel delivery and ignition timing to transmission shifting and emissions control. Instead of facing a costly trip to the dealership for diagnostics and programming, get a reliable, direct-fit solution that arrives ready for installation.
This replacement ECM, part number 12666070, is the definitive fix for a wide range of electronic problems. We take the guesswork and extra expense out of the equation. Before we ship your part, our technicians will program it with the latest official GM software updates, specifically matched to your vehicle using the Vehicle Identification Number (VIN) you provide. This ensures seamless communication between modules and restores the precise performance your vehicle was designed to deliver. A properly functioning 2017 Traverse ECM is critical for fuel economy, engine longevity, and overall drivability.
A Technician’s Notebook: The Intermittent No-Start
I had a 2017 Acadia in the bay last month with a problem that was driving the owner crazy. It would start fine for a week, then refuse to crank for two days, with no rhyme or reason. The battery was new, the starter tested fine, and there were no consistent trouble codes—just a generic U0100 ‘Lost Communication with ECM’ that would pop up sporadically. After checking all the wiring harnesses and grounds for the third time, we swapped in a known-good, programmed ECM. The problem vanished instantly. The original module had an internal hairline fracture on the circuit board that would separate and break connection as the engine bay temperature changed. This is a classic example of how a faulty 2017 Traverse ECM or its equivalent in other models can create ghost-in-the-machine issues that defy simple diagnosis.
Common Signs of a Failing Engine Computer
If you’re experiencing any of the following, a faulty ECM could be the culprit. A failing module can trigger a variety of Diagnostic Trouble Codes (DTCs), and addressing it promptly can prevent further damage to other components.
- ✔ Check Engine Light is on with codes like P0601, P0606, or P062F (Internal Control Module errors).
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or erratic idling and stalling.
- ✔ Noticeable loss of engine power and poor acceleration.
- ✔ Transmission shifting problems or getting stuck in gear.
- ✔ Communication errors with scan tools or other vehicle modules (U-codes).
A Straightforward Guide to Installation
Installing your pre-programmed 2017 Traverse ECM is a manageable job for a confident DIYer. While the location can vary slightly by model, the general process is consistent. Always consult a repair manual for your specific vehicle’s procedures.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all capacitors to discharge.
- Locate the ECM: On the 2017 Traverse, Acadia, and Enclave, the ECM is typically located behind the radiator fan shroud. On other models like the Regal or Equinox, it’s often found in the engine compartment on the driver’s side.
- Disconnect 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 corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep track of the hardware as you will reuse it.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket and tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure (often called a ‘key cycle’) to sync the new ECM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require special tools. Instructions are readily available online or in your owner’s manual.
Verified Vehicle Compatibility
This Engine Control Module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit the following makes and models:
- 2017 Acadia (Limited models, VIN J, located behind fan shroud)
- 2017 Caprice (with 3.6L engine)
- 2017 Enclave (located behind fan shroud)
- 2017 Equinox (located in LH engine compartment)
- 2017-2019 Impala
- 2017 Regal (located in LH engine compartment)
- 2017 Terrain (located in LH engine compartment)
- 2017 Traverse (located behind fan shroud)
- 2017 Verano
- 2017-2019 XTS (with 3.6L LFX engine, VIN 3)
Frequently Asked Questions
Do I need to do anything after I buy it?
Yes. After your purchase, you must send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. This ensures the ECM is a perfect match for your vehicle’s factory specifications.
Is any additional programming required at a dealership?
No. This ECM comes fully programmed with the latest GM software for your VIN. The only step you may need to perform is a simple security relearn procedure, which can be done in your driveway without any special tools.
What is a security relearn procedure?
It’s a process that syncs the new ECM to your car’s existing anti-theft system and keys. Typically, it involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. Your vehicle will not start until this is completed.
Will this fix my specific problem?
This part corrects issues directly caused by a faulty ECM. While it resolves the most common symptoms like no-start conditions, communication errors (U0100), and internal processor faults (P0606), you should always ensure your vehicle has been properly diagnosed by a qualified mechanic to rule out other potential causes like wiring or sensor failures.
Is this a used part?
This is a high-quality, tested replacement part. Each module is meticulously inspected and programmed to meet or exceed original factory performance standards, ensuring reliability and longevity.