Restore Peak Performance and Reliability to Your GM Vehicle
If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your 2017 Buick Regal, the root cause is often a failing Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can disrupt everything from fuel delivery to transmission shifting. It’s the brain of your vehicle’s powertrain, and when it malfunctions, the symptoms can be unpredictable and concerning. This replacement ECM is the definitive solution to get your vehicle running smoothly and reliably again.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit arrives at your door fully programmed with the latest GM software updates, specifically matched to your vehicle using your VIN. This means no expensive trips to the dealership for programming. It’s a direct-fit, plug-and-play solution designed to restore your vehicle’s original performance and efficiency. By providing us with your VIN at checkout, you ensure that the module you receive is perfectly calibrated for your car’s specific systems.
Case Study: A Tricky Diagnosis
A customer brought in a 2017 Chevy Impala with an intermittent stalling problem that no other shop could solve. The car would run fine for days, then suddenly die at a stoplight. There were no consistent trouble codes, just a history of random communication faults. After ruling out fuel and ignition components, we focused on the ECM. On the surface, it seemed fine. However, by monitoring live data streams during a long test drive, we noticed the ECM would momentarily drop communication right before a stall. We swapped in a pre-programmed ECM like this one, and the problem was solved instantly. It’s a classic example of how a failing 2017 Regal ECM (or its equivalent in other models) can cause ghost-like issues that are tough to pin down without experience.
Common Signs of a Failing Engine Module
A failing ECM can manifest in many ways. If you’re noticing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Stalling, stumbling, or rough idling
- ✔ Complete no-start or intermittent starting issues
- ✔ Noticeable decrease in fuel economy
- ✔ Poor acceleration or loss of power
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100
A Straightforward Guide to Installation
Installing your new 2017 Regal ECM is a manageable job for a confident DIYer. Follow these steps carefully to ensure a successful replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: On the 2017 Regal, the ECM is typically found in the engine compartment on the driver’s side. Refer to your owner’s manual for the exact location on other compatible models.
- Disconnect Wiring Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the old ECM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Relearn Procedure: Some vehicles may require a security or idle relearn procedure. A common method is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 30 seconds, and then start the engine. This allows the vehicle’s systems to recognize the new module.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12667002, 12666070, and 12667189. It is guaranteed to fit the following vehicles:
- 2017 Buick Enclave (located behind fan shroud)
- 2017 Buick LaCrosse (3.6L)
- 2017 Buick Regal (located in LH engine compartment)
- 2017 Buick Verano
- 2017 Cadillac XTS (3.6L, VIN 3 – LFX)
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Equinox (located in LH engine compartment)
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Traverse (located behind fan shroud)
- 2017 GMC Acadia (Limited, VIN J – 11th digit)
- 2017 GMC Terrain (located in LH engine compartment)
Frequently Asked Questions
Do I need to do anything after I purchase?
Yes. After you place your order, you must send us your vehicle’s 17-digit VIN. We cannot program and ship your module without it. This ensures the ECM is a perfect match for your car’s factory settings.
Is this a plug-and-play part?
Absolutely. Because we program the module to your VIN before shipping, it is ready for installation right out of the box. No additional programming by a dealer is required, saving you time and money.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (with codes like P0601 or P0606), this part will resolve the issue. However, you should always ensure other potential problems (like sensors or wiring) have been ruled out for a complete diagnosis.
Where is the ECM located on my 2017 Regal?
On the 2017 Buick Regal, the Engine Control Module is located in the engine bay, on the driver’s side (LH). For other models, it is often behind the fan shroud or in a similar location in the engine compartment.
What if I have an anti-theft system?
Our programming accounts for the vehicle’s factory security system. In most cases, performing a simple key cycle or security relearn procedure (as described in the installation steps) is all that’s needed for the vehicle to accept the new module.