Restore Peak Performance to Your Vehicle with a VIN-Programmed ECM
Is your Chevrolet Impala, GMC Acadia, or other compatible GM vehicle experiencing frustrating and unpredictable issues? Problems like a persistent Check Engine Light, rough idling, stalling, or a sudden drop in fuel economy often point to a single, critical component: the Engine Control Module (ECM). As the central computer of your vehicle, a failing ECM can cause a cascade of performance problems that can be difficult to diagnose. This replacement Engine Control Module, part number 12667002, is the definitive solution to restore your vehicle’s factory performance, drivability, and reliability.
We take the guesswork and high dealership costs out of the equation. Unlike a generic module from a parts store, this ECM arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This crucial step ensures seamless integration with your car’s existing systems, including the transmission, anti-lock brakes, and security features. By programming the unit with the latest GM software updates, we ensure it operates with optimal efficiency and corrects any factory software bugs that may have been present in your original unit.
The Critical Role of Your 2017-2019 Impala ECM
The Engine Control Module is the brain of your modern vehicle. It processes a constant stream of data from dozens of sensors throughout the engine and chassis. It reads everything from the crankshaft position and throttle angle to the oxygen content in the exhaust. Using this data, it makes thousands of calculations per second to precisely control fuel injection, ignition timing, variable valve timing, and transmission shift points. When the ECM begins to fail, these critical calculations become erratic, leading to a wide range of symptoms that can make your vehicle unreliable and unsafe to drive.
Common Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) with various trouble codes, especially U-codes or P06xx codes.
- ✔ Engine stumbling, misfiring, or running rough.
- ✔ Unexplained stalling or difficulty starting the engine.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor acceleration or a feeling of reduced engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Cooling fans running constantly or not turning on at all.
- ✔ Communication issues with diagnostic scan tools.
Installation and Required Procedures
Physically replacing the ECM is a straightforward process for a DIY mechanic or any professional technician. The module is typically located in the engine bay for easy access. However, after installation, a critical final step is required: the Security Relearn Procedure (also known as the Passlock or anti-theft relearn). This procedure syncs the new ECM with your vehicle’s existing anti-theft system and keys. Without it, the vehicle will not start. This is a simple procedure that does not require a special scan tool and can be performed in your driveway. Instructions for this procedure are readily available online for your specific model, or your mechanic will be familiar with the process.
Guaranteed Fitment and Compatibility
This module is a direct replacement for several original equipment part numbers and fits a wide range of GM vehicles. Please verify that your vehicle and original part number are listed below. This unit is compatible with the following part numbers:
- 12667002
- 12666070
- 12667189
This part will fit these makes and models with these options:
- ACADIA 2017 – Electronic Control Module; VIN J (11th digit, Limited), (behind fan shroud)
- CAPRICE 2017 – Electronic Control Module; 3.6L
- ENCLAVE 2017 – Electronic Control Module; (behind fan shroud)
- EQUINOX 2017 – Electronic Control Module; (LH engine compartment)
- IMPALA 2017-2019 – Electronic Control Module
- REGAL 2017 – Electronic Control Module; (LH engine compartment)
- TERRAIN 2017 – Electronic Control Module; (LH engine compartment)
- TRAVERSE 2017 – Electronic Control Module; (behind fan shroud)
- VERANO 2017 – Electronic Control Module
- XTS 2017-2019 – Electronic Control Module; (3.6L), VIN 3 (8th digit, opt LFX)
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 the module without it. You can add the VIN to the order notes or send it to us in a message.
Is this ECM truly plug-and-play?
It is pre-programmed to your VIN, which handles 95% of the work. However, you will still need to perform the vehicle’s Security Relearn Procedure after installation. This syncs the module to your keys and is required for the engine to start. This procedure does not require a dealer or special tools.
Will this fix my car’s problem?
This module will correct any issues directly caused by a faulty ECM. It is crucial to have your vehicle properly diagnosed before ordering, as other failing components (like sensors or wiring) can sometimes mimic ECM failure symptoms.
Where is the ECM located on my 2018 Impala?
On the 2017-2019 Chevrolet Impala, the Engine Control Module is typically located in the engine compartment, on the driver’s side, near the air filter housing. Always disconnect the battery before attempting to remove or install the module.
Do you need my old ECM back?
No core charge or return is required for this part. You can keep or dispose of your old module.