Restore Peak Performance to Your Buick Enclave
If you’re dealing with frustrating engine problems in your 2012 Buick Enclave—like stalling, poor fuel economy, or a persistent check engine light—a failing Engine Control Module (ECM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can disrupt everything from engine timing to transmission shifting. This isn’t just an inconvenience; it’s a critical component failure that needs a reliable solution. This listing is for a replacement ECM, part number 12651994, that arrives at your door fully programmed with the latest GM software, matched specifically to your vehicle’s VIN.
Is Your Enclave Showing These Signs of ECM Failure?
A bad engine computer can manifest in numerous ways. Before spending hundreds on diagnostics, see if your vehicle is exhibiting any of these classic symptoms. In my shop, these are the tell-tale signs that point directly to the ECM.
- âś” Unexplained Check Engine Light that won’t clear
- âś” Engine stalling, stumbling, or hesitating during acceleration
- âś” Vehicle enters ‘limp mode’ with reduced power
- âś” Poor fuel mileage and rough idling
- âś” Automatic transmission shifting erratically or harshly
- âś” The engine cranks but refuses to start
- âś” Diagnostic Trouble Codes (DTCs) such as P0601, P0606 (Internal Control Module Memory Check Sum Error), or U0100 (Lost Communication With ECM/PCM)
A Technician’s Notebook: The Intermittent Stall
A customer brought in a 2012 Buick Enclave with a problem that was driving them crazy: it would randomly stall at stoplights, but not every time. There were no consistent trouble codes, just a history of random communication faults. We checked fuel pressure, sensors, and wiring harnesses, but everything tested fine. From experience, I know that heat-soak can cause intermittent failures inside an ECM. We located the ECM behind the fan shroud, a common spot for these vehicles. After letting the engine run for 30 minutes to get hot, a gentle tap on the module caused the engine to stumble immediately. This confirmed our suspicion of an internal solder joint failure. We replaced it with a VIN-programmed module like this one, and the problem was solved for good. It’s a perfect example of how a failing 2012 Enclave ECM can create ghost-like issues that are hard to pin down without experience.
The Simple, Reliable Fix: A VIN-Programmed Module
The biggest hurdle in replacing a modern ECM is the required programming. Dealerships charge a premium for this service. We eliminate that step entirely. When you purchase this module, you simply provide us with your Vehicle Identification Number (VIN). We then flash the unit with the most current, stable software directly from GM for your exact vehicle configuration. This ensures that your engine, transmission, and all related systems communicate perfectly from the moment you install it. This isn’t just a replacement part; it’s a complete, ready-to-install solution that restores your vehicle’s factory-specified operation.
Your Straightforward Installation Guide
Installing your new 2012 Enclave ECM is a manageable task for a DIYer with basic tools. For the Enclave, Acadia, and Traverse, the module is typically located behind the radiator fan shroud.
- 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: On the 2012 Enclave, you’ll find the ECM mounted to a bracket behind the engine’s cooling fan assembly. You may need to remove the upper portion of the fan shroud for easier access.
- Disconnect the Connectors: Carefully unlatch and remove the large electrical connectors from the old ECM. Inspect them for any corrosion or damage before proceeding.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- Reconnect and Secure: Plug the electrical connectors firmly into the new module until they click into place. Reinstall the fan shroud if you removed it.
- Final Step: Reconnect the negative battery terminal. The vehicle may need to complete an idle-relearn procedure, which typically involves starting the engine and letting it idle for several minutes.
Verified Vehicle Compatibility
This ECM, part number 12651994, is a direct replacement for several original equipment part numbers, including 12643248, 12652814, and AA69. It fits a wide range of GM vehicles. Please verify your vehicle and options from the list below.
- ACADIA 2012 (Behind fan shroud)
- CAMARO 2012 (3.6L, ID 12643248 or 12651994)
- CAPRICE 2012-2013 (3.6L)
- CAPTIVA SPORT 2012-2013 (LH engine compartment, ID 12643248 or 12651994)
- CTS 2012-2013 (3.0L or 3.6L), 2014 (Coupe/Wagon, 3.0L or 3.6L)
- ENCLAVE 2012 (Behind fan shroud)
- EQUINOX 2012 (LH engine compartment)
- IMPALA 2012-2013, 2014-2016 (Limited, VIN W)
- LACROSSE 2012 (LH engine compartment)
- MALIBU 2013 (2.4L, ID 12651994, 12643248, or 12652814)
- ORLANDO 2012-2013 (LH engine compartment, ID 12651994 or 12643248)
- REGAL 2012 (LH engine compartment)
- SRX 2012 (LH engine compartment)
- TERRAIN 2012 (LH engine compartment)
- TRAVERSE 2012 (Behind fan shroud)
- VERANO 2012-2013 (2.4L option for 2013)
Frequently Asked Questions
What is an ECM and what does it do?
The Engine Control Module (ECM), also known as the engine computer, is the central brain of your vehicle’s powertrain. It controls critical functions like fuel injection, ignition timing, emissions systems, and automatic transmission shifting to ensure optimal performance and efficiency.
Why do you need my VIN number?
Your Vehicle Identification Number (VIN) allows us to program the ECM with the exact software and calibrations specified by GM for your Enclave’s unique configuration (engine, transmission, options). This step is critical for ensuring the module works perfectly right out of the box.
Is any additional programming required after installation?
No. This module is a complete plug-and-play solution. Because we program it to your VIN before shipping, you will not need to take it to a dealer or mechanic for additional programming. Some vehicles may require a simple security or idle relearn procedure, which you can typically do yourself.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (e.g., DTC P0601), then this replacement module will solve the problem. However, the light can be triggered by many other things, like a bad sensor or a loose gas cap. It’s always best to have the codes read to help identify the source of the issue.
Where is the ECM located on a 2012 Buick Enclave?
On the 2012 Buick Enclave, as well as the GMC Acadia and Chevy Traverse from the same year, the ECM is located behind the radiator cooling fan assembly. You will likely need to remove the upper fan shroud to gain access to it.