Is Your GM Vehicle Running Rough, Stalling, or Showing a Check Engine Light?
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 reliable vehicle into a source of constant frustration. Random error codes, poor fuel economy, shifting problems, or even a no-start condition can often be traced back to the vehicle’s electronic brain. If you’re facing these issues with your 2017 Chevrolet Caprice or another compatible GM model, you’ve found the straightforward, effective solution.
The Simple, Dealer-Free Solution
This isn’t just a replacement part; it’s a complete service. We are providing a genuine GM Engine Control Module, part number 12666070, that is professionally programmed with the latest GM-certified software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This critical step ensures that when the module arrives at your door, it communicates flawlessly with your vehicle’s existing systems, just as the factory intended. You get to skip the expensive dealership visit for programming and the lengthy wait times that come with it.
From My Service Bay to Your Driveway
“A customer’s 2017 Traverse came in last month with a persistent P0171 (System Too Lean) code. The owner had already spent hundreds replacing the MAF sensor and both upstream O2 sensors with no luck. After confirming fuel pressure and checking for vacuum leaks, my diagnostic process led me to the ECM. The driver circuit for the fuel injector on cylinder 3 was failing intermittently, causing the lean condition. We installed one of our VIN-programmed ECMs, and the problem was solved in under 30 minutes. It’s a classic case where chasing parts gets expensive, while correctly identifying the core electronic failure saves time and money.”
Common Symptoms of a Failing 2017 Caprice ECM
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, a failing ECM is a likely culprit:
- ✔ Unexplained Check Engine Light (CEL) with various codes
- ✔ Noticeable drop in fuel efficiency
- ✔ Engine stalling, sputtering, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ Complete no-start or intermittent starting issues
Plug-and-Play Installation: No Dealer Visit Required
Installing your new ECM is a job most DIY mechanics can handle. Follow these general steps to get your vehicle back to peak performance:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: On many of these models, the ECM is found in the engine compartment, often on the driver’s side or behind the fan shroud. Consult a service manual for your specific vehicle’s location.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed module in place and securely tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click. Reconnect the negative battery terminal.
- Final Step: Some vehicles may require a security or crankshaft position sensor relearn procedure, which can be done with many professional-grade scan tools. This ensures perfect communication between the new ECM and the rest of your vehicle’s systems.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is confirmed to fit the following vehicles:
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse (Behind fan shroud)
- 2017-2019 Cadillac XTS (3.6L, VIN 3 – LFX)
- 2017 GMC Acadia (Limited, VIN J – 11th digit)
- 2017 Buick Enclave (Behind fan shroud)
- 2017 Buick Regal (LH engine compartment)
- 2017 Buick Verano
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Equinox (LH engine compartment)
- 2017 GMC Terrain (LH engine compartment)