Restore Peak Performance to Your Chevrolet Trax
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. If your 2013-2016 Chevy Trax is suffering from erratic behavior like stalling, poor fuel mileage, or a persistent Check Engine Light, you’ve likely pinpointed the vehicle’s brain as the culprit. This isn’t just a replacement part; it’s a direct, reliable solution designed to get you back on the road with confidence.
This isn’t a generic, off-the-shelf computer. We take the guesswork and extra expense out of the equation. Before this module ships, we will program it specifically to your vehicle using your VIN. This ensures it has the latest GM software updates and communicates perfectly with your Trax’s other systems right out of the box. You get a plug-and-play fix without the costly trip to the dealership for programming. Simply provide your VIN at checkout, and we’ll handle the rest.
A Technician’s Notebook: The Intermittent No-Start Mystery
A customer brought in a 2015 Trax that would randomly refuse to start. No crank, no click, nothing. All the usual suspects—battery, starter, ignition switch—checked out perfectly. After hours of chasing wires, we noticed the cooling fans would run at full blast when the no-start condition occurred, even with a cold engine. This is a classic tell-tale sign of an ECM that’s not communicating. The module was failing internally when it got warm, creating an open loop that prevented the start sequence. Swapping in a VIN-programmed 2013-2016 Trax Engine Module like this one solved the problem instantly. The customer went from facing a massive diagnostic bill to a simple, effective repair.
Is Your Trax Showing These ECM Failure Signs?
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or inconsistent idling and stalling.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the ECM: On the Chevy Trax, the Engine Control Module is typically located in the engine bay. Consult your vehicle’s service manual for the exact position.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the old module. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original bolts.
- ✔ Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Steps: In many cases, a security relearn procedure is required. This often involves turning the key to the ‘ON’ position for 10-15 minutes. While this unit is programmed, it’s always best practice to consult a service manual for any vehicle-specific relearn steps.
Will This Fit My Vehicle?
This Engine Control Module is a direct replacement for part number 12668866 and is compatible with a wide range of GM vehicles. Please verify your part number or match your vehicle from the list below to ensure proper fitment. This module is guaranteed to fit the following models with the specified options:
CRUZE 15 (Gasoline, ID 12643636 or 12668866)
CRUZE 16 (VIN P, Limited)
ELR 14-16
ENCORE 13-14 (1.4L)
ENCORE 15 (1.4L, ID 12643636 or 12668866)
ENCORE 16 (1.4L, VIN B)
EXPRESS/SAVANA 2500/3500 VAN 16 (4.8L or 6.0L)
SIERRA/SILVERADO 2500/3500 PICKUP 12-16 (6.0L)
SIERRA DENALI 2500/3500 12-16 (6.0L)
SONIC 12-16 (1.4L or specified IDs)
SPARK 14-15 (Gasoline)
SUBURBAN 3500 16
TRAX 13-16
VOLT 11-15
Frequently Asked Questions
What exactly is VIN programming?
VIN programming means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest factory software onto the module before we ship it. This ensures it works correctly with your engine, transmission, and security system, eliminating the need for an expensive trip to the dealer for programming.
Do I need to do anything after installing this module?
This module is sent ready for installation. However, some vehicles may require a simple, non-scan tool procedure like a security or crankshaft position sensor relearn. We recommend checking your vehicle’s service manual for any specific post-installation steps, which can often be done in your driveway.
How do I find my original part number?
Your original part number is printed on a sticker on the housing of your current ECM. Matching this number is the best way to guarantee compatibility. This module replaces several part numbers, including 12668866, 12668994, 12643636, and more, as listed in the description.
Is this a brand new part?
This is a high-quality, tested, and verified recycled OEM part. Each unit is inspected and programmed by our expert technicians to meet or exceed original factory specifications, providing a reliable and cost-effective solution.
What’s the difference between an ECM and a PCM?
ECM (Engine Control Module) and PCM (Powertrain Control Module) are often used interchangeably. A PCM controls both the engine and the transmission, while an ECM typically controls only the engine. For most modern vehicles like your Trax, this single unit manages all powertrain functions.