Restore Your Vehicle’s Core Performance and Reliability
The Engine Control Module (ECM), often called the powertrain control module (PCM), is the central computer of your vehicle. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When the ECM begins to fail, it can cause a wide array of confusing and frustrating problems, often leading to poor performance, reduced fuel economy, or even a vehicle that won’t start. This genuine GM engine control module, part number 12668991, is the definitive solution to restore your vehicle’s factory-specified operation and get you back on the road with confidence.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer could be the culprit. Diagnosing an ECM can be tricky, as its failure can mimic other component failures. Review this list to see if your vehicle’s problems align with common ECM failure indicators:
- ✔ Check Engine Light: The most common symptom, often with codes that are erratic or point to multiple unrelated sensors.
- ✔ Engine Stalling or Misfiring: The engine may stall intermittently, misfire, or run rough for no apparent reason.
- ✔ No-Start Condition: The engine cranks but refuses to start, indicating a potential loss of fuel or spark control from the ECM.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG can be caused by the ECM failing to properly regulate the air-fuel mixture.
- ✔ Inconsistent Transmission Shifting: On automatic vehicles, you might notice harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Loss of Power: The vehicle may feel sluggish and unresponsive, especially during acceleration.
From the Diagnostic Bay
We had a 2014 Chevy Cruze come in with a ghost problem. The owner complained of random stalling at stoplights, but it never threw a consistent code. Other shops had replaced the throttle body and a few sensors, but the issue persisted. We hooked up our diagnostic scanner and monitored live data. Everything looked normal until we saw it – for a split second, the ECM’s internal processor voltage would dip, causing it to momentarily lose communication with the fuel pump relay. It was a classic sign of internal board failure. We installed a VIN-programmed ECM, performed the crankshaft position relearn, and the stalling issue was gone for good. It’s a reminder that sometimes the problem lies with the brain, not the sensors it’s reading.
A True Plug-and-Play Solution for Your 2013-2016 Trax ECM
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership. We take the hassle out of the repair. When you purchase this 2013-2016 Trax ECM, we program it specifically for your vehicle using the 17-digit Vehicle Identification Number (VIN) you provide. This critical step ensures that the module communicates perfectly with your vehicle’s existing systems, including the anti-theft system, transmission, and all related sensors. We flash it with the latest, most stable software updates directly from GM, which can often resolve underlying drivability issues the original software may have had.
Installation and Post-Install Procedures
Once you receive your pre-programmed module, installation is straightforward. Simply disconnect the battery, remove the old ECM, and install the new one. After reconnecting the battery, some vehicles may require a simple security relearn procedure (often called a key cycle) or a crankshaft position variation relearn. These procedures are often simple and can be completed by a local mechanic or a knowledgeable DIYer with a capable scan tool, ensuring all engine parameters are perfectly calibrated.
Guaranteed Compatibility
This ECM is a direct replacement for a wide range of GM vehicles. To ensure a perfect match, please verify that your original module’s part number is on this list. This unit is a direct replacement for the following part numbers:
12668866, 12668994, 12643636, 12663405, 12670335, 22819494, 12692200
While this is a popular solution for the 2013-2016 Trax ECM, it also fits many other models including the Cruze, Sonic, Encore, Volt, and various GM trucks and vans. Please consult the detailed fitment list to confirm compatibility with your specific make, model, and year.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. It will arrive ready to be installed in your vehicle. All you need to do is provide us with your vehicle’s 17-digit VIN during checkout.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit serial number. You can typically find it on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the ECM is the root cause of the fault codes, then yes, this will resolve the issue. After installation, it is essential to clear all existing diagnostic trouble codes (DTCs) with a scan tool.
Is a ‘relearn’ procedure required after installation?
In many cases, no. However, some GM vehicles may require a simple security relearn or a crankshaft position variation relearn to ensure optimal performance. This can be done by any competent mechanic or with a high-quality bidirectional scan tool.
How can I be sure this fits my vehicle?
The best way is to match the part number from your original ECM to one of the numbers listed in our description (e.g., 12668866, 12643636). If you are unsure, please contact us with your VIN, and we will be happy to verify compatibility for you.