Restore Your Vehicle’s Core Performance and Reliability
Is your GM vehicle suffering from frustrating issues like a persistent check engine light, poor fuel economy, intermittent stalling, or a complete no-start condition? The Engine Control Module (ECM), often called the vehicle’s ‘brain,’ is the central command unit responsible for managing engine performance, emissions, and communication with other modules. When it fails, it can create a cascade of problems that are often difficult to diagnose. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can mimic other component failures, leading to wasted time and money on unnecessary repairs.
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and high dealership costs out of the equation. Each module is meticulously programmed with the latest official GM software updates tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures seamless integration, optimal performance, and that all factory parameters are perfectly restored. Simply provide your VIN after purchase, and we’ll handle the complex programming before it even ships. You receive a true plug-and-play module, ready for installation right out of the box.
From the Diagnostic Bay: The Intermittent No-Start Mystery
A customer brought in their 2017 Equinox with a maddening problem: it would randomly refuse to start. No crank, no click—just silence. All the usual suspects checked out: battery was strong, starter tested good, and there were no obvious wiring issues. The challenge was the lack of consistent diagnostic trouble codes (DTCs). After hours of tracing circuits, we finally caught a U0100 (Lost Communication with ECM/PCM) code during one of the failure events. The ECM was intermittently dropping offline. Instead of a costly trip to the dealer for a new module and programming fees, we sourced a VIN-programmed unit like this one. The installation took less than 30 minutes, and the vehicle started perfectly every time. This solution saved the customer hundreds of dollars and got them back on the road with confidence.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U-series communication faults.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The vehicle experiences intermittent stalling or rough idling.
- ✔ Automatic transmission shifts erratically or harshly.
- ✔ Apparent loss of power and poor acceleration.
- ✔ Communication issues with diagnostic scan tools.
A Straightforward Guide to Installation
Installing your new 2017 Verano Engine Control Module is a manageable task for a confident DIYer. Always consult a vehicle-specific repair manual for detailed instructions and torque specs.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all systems are powered down.
- 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. Its location is noted in the fitment list below.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket or the vehicle body. Remove the old module.
- Install the New Module: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect and Secure: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Some vehicles may require a security relearn or throttle body relearn procedure, which can often be completed without special tools. Start the vehicle and check for proper operation and ensure the check engine light is off.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12667002, 12666070, and 12667189 and is guaranteed to fit the following vehicles and options:
- 2017 Buick Enclave: Electronic Control Module; (located behind fan shroud)
- 2017 Buick LaCrosse: Electronic Control Module; (3.6L)
- 2017 Buick Regal: Electronic Control Module; (located in LH engine compartment)
- 2017 Buick Verano: Electronic Control Module
- 2017 Cadillac ATS: Electronic Control Module; (3.6L)
- 2017-2019 Cadillac XTS: Electronic Control Module; (3.6L), VIN 3 (8th digit, opt LFX)
- 2017 Chevrolet Caprice: Electronic Control Module; 3.6L
- 2017-2019 Chevrolet Impala: Electronic Control Module
- 2017 Chevrolet Traverse: Electronic Control Module; (located behind fan shroud)
- 2017 GMC Acadia: Electronic Control Module; VIN J (11th digit, Limited), (located behind fan shroud)
- 2017 GMC Terrain: Electronic Control Module; (located in LH engine compartment)
- 2017 Chevrolet Equinox: Electronic Control Module; (located in LH engine compartment)
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the correct, vehicle-specific software from GM. This ensures the 2017 Verano Engine Control Module communicates perfectly with your car’s other systems, just like the original part from the factory.
Is any additional programming required after installation?
No. This ECM arrives fully programmed and ready for installation. In some rare cases, a simple, non-tool security relearn procedure may be needed, which is outlined in many owner’s manuals or online resources.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601, P0606), then this part is the correct fix. It is crucial to properly diagnose the vehicle first, as other sensors or wiring issues can also trigger a check engine light.
Where is the ECM located on my 2017 Verano?
On the 2017 Buick Verano, the Electronic Control Module is typically located in the engine compartment. Always confirm the location with a repair manual for your specific vehicle before beginning work.
What if I have a different part number?
This module directly replaces part numbers 12667002, 12666070, and 12667189. If your original module has one of these numbers, this is the correct part for you. Please check your original part before ordering.