Restore Your Vehicle’s Brain and Get Back on the Road with Confidence
Is your Chevrolet Sonic, Cruze, or other GM vehicle running rough, stalling unexpectedly, or refusing to start? Are you staring at a persistent Check Engine Light and dealing with frustrating performance issues? A failing Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. This isn’t just an inconvenience; it affects fuel economy, emissions, and overall vehicle safety. This listing offers a direct, reliable solution: a replacement ECM, part number 12668866, that arrives at your door pre-programmed for your specific vehicle.
Case Study: A Tricky Diagnosis
I remember a 2014 Chevy Sonic that came into my bay with a complaint that stumped two other shops. The car would run fine for days, then suddenly lose power, with the throttle becoming unresponsive and the dash lighting up. Scans showed a cascade of communication error codes (U-codes) that would disappear after a restart. We checked wiring harnesses and sensors for hours. Finally, based on experience with these platforms, we suspected the ECM was failing internally only when it reached a specific operating temperature. We swapped in a known-good programmed module, and the problem vanished instantly. This experience taught me that with modern complex electronics, intermittent issues often point directly to the processor, and a quality-tested, correctly programmed 2012-2016 Sonic Engine Module is the only surefire fix.
Is Your GM Vehicle Showing These Signs of ECM Failure?
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, a failing ECM is a likely cause. Look out for:
- âś” Check Engine Light is on with no clear cause, or with internal module codes like P0601, P0606.
- âś” Loss of communication codes (U0100, U0101) that indicate the ECM isn’t talking to other modules.
- âś” Engine cranks but refuses to start.
- âś” Intermittent stalling or stumbling while driving.
- âś” Noticeable decrease in fuel mileage.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to pass a state emissions inspection.
The Power of VIN Programming: Skip the Dealership Hassle
One of the biggest hurdles in replacing an ECM is the required programming. Traditionally, you’d have to buy the part, install it, and then have your vehicle towed to a dealership for expensive software flashing. We eliminate that entire step. When you purchase from us, you simply provide your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program this 2012-2016 Sonic Engine Module with the latest, most stable software updates directly from GM. It arrives ready for installation, saving you time, towing fees, and dealership labor costs.
A Straightforward Guide to Installation
Installing your new engine computer is a manageable job for a confident DIYer. While specific locations vary slightly by model, the general process is consistent. Always consult a repair manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: On most Sonics, Cruzes, and Trax models, the ECM is mounted on the driver’s side of the engine bay, near the firewall or battery. On larger trucks and vans, it’s often on the driver’s side front fender.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Do not force them. Inspect connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s typically held in place by a few 10mm bolts.
- Install the New Module: Mount your new, pre-programmed ECM in place and tighten the bolts securely.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect your vehicle’s negative battery terminal.
- Final Step: In some cases, a security or anti-theft relearn procedure may be required. This can often be done without special tools by cycling the key. Instructions will be provided if necessary for your vehicle.
Verified Vehicle Compatibility
This ECM is a direct replacement for several part numbers and fits a wide range of General Motors vehicles. Please verify your vehicle is on this list. This module is compatible with part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
- Buick Encore: 2013-2016 (1.4L)
- Cadillac ELR: 2014-2016
- Chevrolet Cruze: 2012-2016 (Gasoline, including 1.4L & Limited)
- Chevrolet Express Van (2500/3500): 2016 (4.8L, 6.0L)
- Chevrolet Silverado (2500/3500): 2012-2016 (6.0L)
- Chevrolet Sonic: 2012-2016
- Chevrolet Spark: 2014-2015 (Gasoline)
- Chevrolet Suburban 3500: 2016
- Chevrolet Trax: 2013-2016
- Chevrolet Volt: 2011-2015
- GMC Savana Van (2500/3500): 2016 (4.8L, 6.0L)
- GMC Sierra / Sierra Denali (2500/3500): 2012-2016 (6.0L)
Frequently Asked Questions About This ECM
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship the module until we receive this information.
Do I need to do anything else after installation?
In most cases, the module is plug-and-play. Some vehicles may require a simple key-cycle security relearn procedure, which does not require any special tools. We will provide instructions if it applies to your vehicle.
Will this fix my specific problem?
This part corrects issues directly caused by a faulty ECM. It’s crucial to ensure your vehicle has been properly diagnosed. This module will not fix problems related to bad sensors, wiring, or other mechanical failures.
What if my original part number is slightly different?
This ECM replaces multiple part numbers, including 12668994, 12643636, and others listed above. As long as your vehicle model and year are listed in our compatibility chart, this module will function correctly once programmed to your VIN.
How long does the programming and shipping process take?
Programming is typically completed within one business day of receiving your VIN. We then ship the module out promptly so you can get your vehicle repaired as quickly as possible.
Is this a reliable, tested part?
Absolutely. Each 2012-2016 Sonic Engine Module is thoroughly inspected and tested to ensure it meets or exceeds OEM specifications for performance and reliability before being programmed and shipped.