Is Your Buick Encore Running Rough or Refusing to Start?
As a technician with over two decades of experience under the hood, I’ve seen countless drivers frustrated by baffling electrical issues. If your 2013-2016 Buick Encore is experiencing problems like stalling, erratic idling, a persistent check engine light, or a complete no-start condition, the culprit is often the Engine Control Module (ECM). This component is the ‘brain’ of your vehicle’s engine, and when it fails, it can cause a cascade of confusing and concerning symptoms. Don’t let a faulty computer keep you sidelined. This direct-replacement ECM is the reliable, straightforward solution you need.
We take the guesswork and high dealership costs out of the equation. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest official GM software, specifically matched to your vehicle’s unique VIN. This means no extra trips to the dealer and no need for expensive specialty programming tools. It’s designed to restore your vehicle’s original performance, fuel efficiency, and reliability right out of the box. Getting your Encore back to peak condition starts with a reliable 2013-2016 Encore Engine Module.
A Technician’s Notebook: The Intermittent Encore
A customer brought in their 2015 Encore with a truly frustrating problem: it would randomly fail to start. Sometimes it was fine for weeks, then it would refuse to crank for an hour before magically working again. There were no consistent trouble codes, just a history of lost communication (U-codes) with various modules. We checked the battery, starter, and wiring—all perfect. From experience, these ghost-like electrical issues often point to the ECM. We swapped in a known-good, programmed module, and the problem vanished instantly. The original ECM had an internal hairline fracture on the circuit board that would separate when the temperature changed, causing the intermittent failure. It’s a classic case where the symptoms don’t tell the whole story, but the fix is a quality replacement part.
Common Signs of a Failing ECM
- âś” Check Engine Light is illuminated with codes like P0601, P0606, or U0100.
- âś” The engine cranks but refuses to start.
- âś” Unexplained drops in fuel economy.
- âś” Rough or unstable idling and frequent stalling.
- âś” Noticeable loss of power and poor acceleration.
- âś” Automatic transmission shifts harshly or at the wrong times.
- âś” Other warning lights (like traction control) appearing randomly.
A Straightforward Guide to Installation
- âś” Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- âś” Locate the ECM: On the Buick Encore, the Engine Control Module is typically located in the engine bay. Consult your vehicle’s service manual for the exact position.
- âś” Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old module. Avoid pulling on the wires themselves.
- âś” Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to the vehicle and remove it.
- âś” Install the New Module: Mount your new, pre-programmed ECM in place and secure it with the original hardware.
- âś” Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- âś” Perform Security Relearn (If Necessary): In some GM vehicles, a simple security or anti-theft relearn procedure is required. This can typically be done without special tools by cycling the key in the ignition. Instructions are readily available online or in service manuals.
Verified Vehicle Compatibility
This ECM, part number 12668866, is a direct replacement for a wide range of General Motors vehicles. While this listing focuses on the 2013-2016 Encore Engine Module, please verify your part number and model in the list below to ensure perfect compatibility. This module also interchanges with part numbers: 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
CHEVROLET CRUZE 12-16 (1.4L, Gasoline)
CHEVROLET ELR 14-16 (Gasoline)
CHEVROLET EXPRESS 2500/3500 VAN 16 (4.8L, 6.0L)
CHEVROLET SILVERADO 2500/3500 PICKUP 12-16 (6.0L)
CHEVROLET SONIC 12-16 (1.4L)
CHEVROLET SPARK 14-15 (Gasoline)
CHEVROLET SUBURBAN 3500 16
CHEVROLET TRAX 13-16
CHEVROLET VOLT 11-15 (Gasoline)
GMC SAVANA 2500/3500 VAN 16 (4.8L, 6.0L)
GMC SIERRA 2500/3500 PICKUP 12-16 (6.0L)
GMC SIERRA DENALI 2500/3500 12-16 (6.0L)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the latest GM software specific to your car. This makes installation much simpler.
Is this a simple plug-and-play installation?
For most vehicles, yes. After the physical installation, you may need to perform a simple key-cycle security relearn procedure, which does not require any special tools. We recommend searching for the specific procedure for your model year.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM (common codes P0601-P0606), then this replacement part will resolve the issue. It’s always best to have the codes read with a scanner to confirm the diagnosis before ordering.
Is this a genuine GM part?
This is a high-quality, tested original equipment part that has been professionally programmed to meet or exceed OEM specifications, ensuring reliable performance and compatibility for your vehicle.
What if I order the wrong part?
We strongly encourage you to verify compatibility using your vehicle’s original part number and our fitment list. Providing your VIN for programming helps us double-check the application. Please contact us if you need help confirming fitment before you buy.