Is Your 2017 Equinox Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating issues like stalling, poor fuel economy, a persistent check engine light, or a no-start condition in your 2017 Chevrolet Equinox, the problem may lie with the very brain of your engine: the Engine Control Module (ECM). This critical component is responsible for managing everything from fuel injection and ignition timing to emissions control and transmission communication. When it begins to fail, it can cause a cascade of confusing and seemingly unrelated problems, making diagnosis a nightmare. This replacement ECM, part number 12667002, is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We once had a 2017 GMC Terrain (which uses the same ECM) come into the shop with a maddening intermittent stalling problem. The owner had been to two other shops that couldn’t pinpoint the issue because no hard codes were being stored. The vehicle would just die at a stoplight, then start right back up. We hooked up our diagnostic scope and monitored the injector pulse width signals directly from the ECM. After a long test drive, we finally caught it: just before a stall, the ECM would suddenly cut the signal to multiple injectors for a split second. The internal driver circuit was failing under heat soak. We installed a VIN-programmed ECM, and the phantom stalling issue was gone for good. It’s a classic example of how a failing computer can create problems that look like something else entirely.
Common Symptoms of a Failing 2017 Equinox ECM
A faulty engine computer can manifest in various ways. If your vehicle is exhibiting any of the following symptoms, it’s a strong indicator that your ECM needs replacement. Look out for:
- ✔ Check Engine Light: The light is illuminated, often with communication-related fault codes (U-codes) or performance codes that don’t seem to have a mechanical cause.
- ✔ Engine Performance Issues: You may experience random misfires, stumbling, hesitation during acceleration, or a general lack of power.
- ✔ No-Start Condition: The engine cranks over but refuses to start, suggesting a lack of fuel or spark command from the ECM.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s MPG can be caused by the ECM failing to properly regulate the air-fuel mixture.
- ✔ Transmission Problems: The ECM works closely with the Transmission Control Module (TCM). A failing ECM can lead to harsh shifting, delayed engagement, or incorrect gear selection.
- ✔ Intermittent Stalling: The vehicle may shut off unexpectedly while driving or when coming to a stop, as described in our story.
The Importance of VIN Programming
You can’t simply take an ECM from another vehicle and expect it to work. Modern vehicles have complex anti-theft systems (immobilizers) and require precise software to function. This ECM is not just a part; it’s a complete solution. When you purchase from us, you provide your vehicle’s 17-digit Vehicle Identification Number (VIN). We then flash the module with the latest, most stable software release from GM specific to your Equinox. This process ensures:
- Seamless Communication: The new ECM will communicate flawlessly with all other modules in your vehicle, like the BCM, TCM, and ABS controller.
- Immobilizer Sync: The programming matches the ECM to your vehicle’s security system, allowing the engine to start and run.
- Optimal Performance: Your vehicle’s specific parameters for engine size, transmission type, and emissions equipment are loaded, guaranteeing factory performance.
- Plug-and-Play Installation: In most cases, this module is a direct plug-in replacement with no further dealer visits required. Some vehicles may require a simple idle relearn or security relearn procedure, which can be done without special tools.
Guaranteed Fitment
This Engine Control Module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit the following vehicles:
- 2017 Chevrolet Equinox (LH engine compartment)
- 2017 GMC Terrain (LH engine compartment)
- 2017 Buick Regal (LH engine compartment)
- 2017 Buick Verano
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse (behind fan shroud)
- 2017-2019 Cadillac XTS (3.6L, VIN 3)
- 2017 GMC Acadia (Limited, VIN J, behind fan shroud)
- 2017 Buick Enclave (behind fan shroud)
Frequently Asked Questions
Is this ECM ready to install right out of the box?
Yes. Once you provide us with your vehicle’s VIN, we program the module completely. It arrives at your door ready for installation, requiring no additional programming at a dealership.
What information do you need from me?
After you place your order, we will need your vehicle’s 17-digit VIN. You can typically find this on your driver’s side door jamb sticker or on the dashboard visible through the windshield.
Do I need to send my old, broken ECM back?
No. There is no core charge or need to return your original part. You can keep it or dispose of it responsibly.
Will this fix my check engine light?
This module will resolve the check engine light if the light is caused by an internal failure of the ECM itself. You should always have your vehicle scanned for fault codes to help confirm the ECM is the point of failure.
Where is the ECM located on my 2017 Equinox?
On the 2017 Chevrolet Equinox, the ECM is typically located in the engine bay on the driver’s side (LH side), often mounted near the firewall or inner fender.