Restore Your Buick’s Reliability and Performance
Is your 2013-2016 Buick Encore running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen these symptoms countless times, and they often point directly to a failing Engine Control Module (ECM). The ECM is the brain of your vehicle, managing everything from fuel mixture and ignition timing to transmission shifts. When it falters, the entire vehicle’s performance suffers, leaving you with an unreliable and frustrating driving experience. This isn’t just an inconvenience; it can be a serious safety concern.
We offer a dependable and straightforward solution: a replacement Engine Control Module, part number 12668866, that arrives at your doorstep fully programmed to your vehicle’s specific VIN. This eliminates the most expensive and complicated step of the repair. Forget about costly dealership visits, towing fees, and complex programming procedures. With this module, you’re getting a reliable part loaded with the latest GM software updates, ensuring optimal performance and communication with all other vehicle systems. This is the definitive fix for getting your Buick, Chevy, or GMC back on the road quickly and affordably.
A Technician’s Notebook
I remember a 2015 Buick Encore that came into my bay with a bizarre set of issues. The owner reported intermittent stalling at red lights, poor acceleration, and a check engine light that would come and go. His local mechanic had already replaced the spark plugs and an oxygen sensor, but the problem persisted. My initial scan pulled a P0606 (ECM/PCM Processor Fault) and a U0100 (Lost Communication With ECM/PCM). While communication codes can be tricky, the processor fault code was the real giveaway. After verifying the wiring and grounds were solid, we confirmed the original ECM was failing internally. We installed a VIN-programmed module just like this one, and it was like driving a new car. The engine smoothed out, power was restored, and all codes were cleared. It’s a classic case where chasing individual symptoms can be costly, while addressing the root cause—the ECM—provides a complete and lasting solution.
Is Your Vehicle Showing These Signs of ECM Failure?
A failing engine computer can cause a wide range of problems. If you’re experiencing any of the following, a faulty 2013-2016 Encore ECM could be the culprit. Look out for these common indicators:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Vehicle won’t start or is difficult to start
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Poor engine performance and lack of power
A Straightforward Guide to Installation
One of the biggest benefits of our pre-programmed module is the simple installation process. While professional installation is always an option, many DIYers can handle this job with basic tools. Follow these steps for a successful replacement:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On the Buick Encore and many similar models, the ECM is typically found in the engine bay, often near the battery or firewall. It’s a silver box with several large electrical connectors.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle. The check engine light may be on initially. In many cases, the vehicle may require a security relearn procedure or for the codes to be cleared with a standard OBD2 scanner. The vehicle is now ready for use.
Verified Vehicle Compatibility
This Engine Control Module is a direct-fit replacement for a wide variety of General Motors vehicles. Please verify your part number (12668866) or match your vehicle, year, and engine options from the list below to ensure proper fitment. This module also interchanges with part numbers 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
ENCORE 13-14 (1.4L)
ENCORE 15 (1.4L), ID 12643636 or 12668866
ENCORE 16 (1.4L), VIN B (8th digit, opt LUV)
Cadillac:
ELR 14-16 Gasoline, (LH rear engine compartment)
Chevrolet:
CRUZE 12-14 (1.4L & Gasoline)
CRUZE 15 Gasoline, ID 12643636 or 12668866
CRUZE 16 VIN P (4th digit, Limited)
EXPRESS 2500/3500 VAN 16 (LH rear engine compartment), 4.8L or 6.0L
SILVERADO 2500/3500 PICKUP 12-16 (LH front engine compartment), 6.0L
SONIC 12 (1.4L)
SONIC 13 ID 12643636
SONIC 14 (ID 12643636)
SONIC 15 ID 12668866 or 12643636
SONIC 16
SPARK 14-15 Gasoline model
SUBURBAN 3500 16 (LH front engine compartment)
TRAX 13-16 (1.4L)
VOLT 11-15 Gasoline, (LH rear engine compartment)
GMC:
SAVANA 2500/3500 VAN 16 (LH rear engine compartment), 4.8L or 6.0L
SIERRA 2500/3500 PICKUP 12-16 (LH front engine compartment), 6.0L
SIERRA DENALI 2500 12-15 (LH front engine compartment), 6.0L
SIERRA DENALI 3500 12-16 (LH front engine compartment), 6.0L
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. This is the biggest advantage of our service. We program the module to your car’s specific VIN before we ship it. It arrives ready for installation, saving you hundreds of dollars in dealership programming fees.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is specific to your vehicle.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. In most modern vehicles, a single PCM controls both the engine and the transmission. For this application, the terms refer to the same part.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (e.g., codes P0601, P0606), then yes, this part will resolve the issue. However, you should always perform a proper diagnosis to ensure the ECM is the root cause and not another sensor or component.
Is this a reliable, long-term fix?
Absolutely. We supply high-quality, tested modules that are programmed with the latest stable software from GM. This ensures proper function and communication with your vehicle’s other systems for a lasting repair.