Restore Peak Performance to Your Vehicle’s Engine
Is your Chevrolet Spark, Cruze, or Sonic suddenly stalling, refusing to start, or running rough? Are you battling a persistent Check Engine Light with codes that just won’t go away? Before you resign yourself to a costly dealership visit, consider the heart of your vehicle’s engine management system: the Engine Control Module (ECM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing ECM can cause some of the most frustrating and difficult-to-diagnose problems. This isn’t just a part; it’s the solution to getting your vehicle back on the road with confidence.
This replacement ECM, part number 12668866, is the definitive fix for a wide range of GM vehicles. What sets our service apart is that we handle the most critical step for you. We flash the module with the very latest GM-certified software, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This means no expensive programming tools or trips to the dealer are required. It arrives at your door ready for a straightforward installation, restoring the precise fuel delivery, ignition timing, and emissions control your engine was designed for.
Case Study: A Tricky Diagnosis
A customer brought in a 2015 Chevy Sonic that had two other shops stumped. It had an intermittent no-start condition with no consistent trouble codes. Sometimes it would start perfectly for a week, then fail in a parking lot. After checking all the usual suspects—battery, starter, fuel pump—I focused on the ECM. On a hunch, I monitored the 5-volt reference signal from the module during a wiggle test of the main harness. Sure enough, the voltage would drop out intermittently, pointing to an internal failure in the ECM. We replaced it with one of our pre-programmed modules, and the customer called a month later to say the problem was completely gone. This simple swap saved them from potentially replacing dozens of other sensors chasing a ghost.
Common Signs of a Failing ECM
If you’re experiencing any of the following, a faulty Engine Control Module could be the culprit. A failing ECM can often trigger diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or various communication errors (U-codes).
- ✔ Check Engine Light is on with seemingly unrelated codes.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Stalling, stuttering, or hesitation during acceleration.
- ✔ Rough or inconsistent idling.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Installing your new 2014-2015 Spark Engine Control Module is a manageable task for a confident DIYer. Taking your time and following these steps will ensure a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On most compatible models like the Spark, Sonic, or Cruze, the ECM is typically found in the engine bay, often near the battery or firewall. It’s a silver box with multiple large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab or lever that needs to be released. Once disconnected, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket. Securely reconnect all electrical harnesses, ensuring they click into place.
- Reconnect and Start: Reattach the negative battery terminal. In some cases, a security relearn procedure may be necessary, which typically involves turning the key to the ‘On’ position for 10-15 minutes. Start the vehicle and let it idle to confirm proper operation.
Will This Fit My Vehicle?
We guarantee compatibility with a wide array of GM vehicles. This module is a direct replacement for part numbers 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. Please verify your vehicle from the list below. After purchase, simply provide us with your VIN to ensure your new 2014-2015 Spark Engine Control Module is programmed perfectly for your specific car or truck.
- Buick Encore: 2013-2016 (1.4L)
- Cadillac ELR: 2014-2016 (Gasoline)
- Chevrolet Cruze: 2012-2014 (1.4L/Gasoline)
- Chevrolet Cruze: 2015 (Gasoline, ID 12643636 or 12668866)
- Chevrolet Cruze Limited: 2016 (VIN P)
- Chevrolet Express 2500/3500 Van: 2016 (4.8L or 6.0L)
- Chevrolet Silverado 2500/3500 Pickup: 2012-2016 (6.0L)
- Chevrolet Sonic: 2012-2016 (1.4L or matching ID)
- Chevrolet Spark: 2014-2015 (Gasoline Model)
- Chevrolet Suburban 3500: 2016
- Chevrolet Trax: 2013-2016
- Chevrolet Volt: 2011-2015 (Gasoline)
- GMC Savana 2500/3500 Van: 2016 (4.8L or 6.0L)
- GMC Sierra 2500/3500 Pickup: 2012-2016 (6.0L)
- GMC Sierra Denali 2500/3500: 2012-2016 (6.0L)
Frequently Asked Questions
Do I need to do any programming myself?
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 or after checkout, and the module will arrive with the latest GM software, ready for installation.
Is this a brand new part?
This is a high-quality, tested, and verified used OEM part. Each unit is inspected and programmed to strict standards to ensure it meets or exceeds original factory performance.
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 placard on the driver’s side dashboard visible through the windshield.
Will this fix my car’s specific problem?
This module corrects issues directly caused by a failing ECM. While it resolves the most common symptoms like stalling, no-starts, and specific ECM-related codes (P0601, etc.), we always recommend a proper diagnosis to confirm the ECM is the root cause before ordering.
What if my original part number isn’t 12668866?
This module is a direct replacement for several part numbers, including 12668994, 12643636, and others listed in our compatibility section. As long as your vehicle is on the fitment list, this module will work once programmed to your VIN.