Restore Peak Performance and Reliability to Your GM Vehicle
Is your vehicle suffering from frustrating issues like a persistent Check Engine Light, erratic engine behavior, stalling, or a complete no-start condition? These are classic signs that the brain of your engine—the Engine Control Module (ECM)—may be failing. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cripple an otherwise healthy vehicle. This isn’t just an inconvenience; it affects your car’s fuel economy, emissions, and overall safety. This replacement module is the definitive solution, arriving pre-programmed with the latest GM software specifically for your car’s Vehicle Identification Number (VIN).
From the Diagnostic Bay: A 2017 Regal’s Ghost in the Machine
A customer brought in their 2017 Buick Regal with a problem that was driving them crazy. The car would randomly refuse to start, but only after it was warm. There were no consistent trouble codes, just an intermittent U0100 (Lost Communication With ECM/PCM) that would pop up and disappear. We checked the battery, alternator, and all major wiring harnesses—everything was perfect. After spending hours chasing this electrical ghost, experience pointed me to the ECM. We swapped in a pre-programmed module, and the problem vanished instantly. The original ECM had an internal fault that only manifested under specific temperature conditions—a common failure mode I’ve seen in hundreds of modules.
Is Your Vehicle Showing These Symptoms?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need.
- ✔ Persistent Check Engine Light (CEL) illumination.
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0606, or P062F.
- ✔ Communication error codes like U0100, indicating the ECM isn’t talking to other modules.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Complete no-start or intermittent starting problems.
A Straightforward Guide to Installation
Replacing the ECM is a task many DIYers can handle. Our pre-programming service eliminates the most difficult step, saving you a trip to the dealership. For your 2017 Regal, the module is located in the left-hand (driver’s side) engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the ECM: Open the hood and find the ECM on the driver’s side of the engine bay. It’s a metal box with large electrical connectors.
- Disconnect and Remove: Carefully unlatch and remove the electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Firmly reconnect the electrical connectors, ensuring they click and lock securely.
- Reconnect Power: Re-attach the negative battery terminal and tighten it.
- Perform Relearn Procedure: For many GM vehicles, a security or theft-deterrent relearn procedure is required after installation. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the specific procedure for your model.
Guaranteed Fitment for Your GM Vehicle
This Engine Control Module is a direct-fit replacement for several GM models and is interchangeable with part numbers 12667002, 12666070, and 12667189. Please verify your vehicle is on the list below. We program it using your VIN to ensure perfect compatibility.
- 2017 Buick Enclave: (Located behind fan shroud)
- 2017 Buick Regal: (Located in LH engine compartment)
- 2017 Buick Verano
- 2017 Cadillac XTS: (3.6L, VIN 3)
- 2017 Chevrolet Caprice: (3.6L)
- 2017 Chevrolet Equinox: (Located in LH engine compartment)
- 2017 Chevrolet Traverse: (Located behind fan shroud)
- 2017-2019 Chevrolet Impala
- 2017 GMC Acadia: (Limited models, VIN J)
- 2017 GMC Terrain: (Located in LH engine compartment)