Restore Peak Performance to Your Chevrolet Trax
If you’re dealing with frustrating issues like a persistent check engine light, stalling, rough idling, or a no-start condition in your 2013-2016 Chevrolet Trax, a failing Engine Control Module (ECM) is often the culprit. As the central computer of your vehicle, the ECM governs everything from fuel mixture and ignition timing to transmission shifting. When it falters, the symptoms can be unpredictable and difficult to diagnose. This is a direct-fit, reliable solution to get your vehicle back on the road and running smoothly.
A Technician’s Notebook: The Intermittent No-Start
I once had a 2014 Chevy Cruze with the 1.4L engine—which uses this exact same family of ECMs—come into my bay with a maddening intermittent no-start. The owner had replaced the battery, starter, and checked all the fuses. It would start fine for a week, then nothing. No codes were stored. After hours of tracing wires, I noticed the fuel pump relay wasn’t getting its ground signal from the ECM, but only when the engine bay was hot. The ECM’s internal processor was failing under thermal stress. Swapping in a properly programmed module like this one solved the problem instantly. It’s a classic example of how a failing ECM can create ghost-like issues that defy simple diagnosis.
Is Your Trax Exhibiting These Symptoms?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution you need. Look out for:
- âś” Check Engine Light (CEL) illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” Unexplained stalling or engine hesitation during acceleration.
- âś” Complete no-start condition where the engine cranks but won’t fire up.
- âś” Poor fuel economy and a noticeable drop in engine power.
- âś” Communication errors with scan tools, often showing U-codes.
- âś” Harsh or erratic automatic transmission shifting.
The Critical Advantage: VIN-Specific Programming
Don’t make the mistake of installing a used ECM from a junkyard. Modern vehicles have complex security systems (like Immobilizer) that are tied to the vehicle’s specific VIN. This 2013-2016 Trax Engine Control Module arrives at your door pre-programmed with the latest GM software specifically for your vehicle. All we need is your VIN during checkout. This process ensures the module communicates perfectly with your car’s other systems, saving you a costly trip to the dealership for programming.
A Straightforward Guide to Installation
While professional installation is always an option, this is a job a confident DIYer can handle. The pre-programming makes it significantly simpler.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning.
- Locate the ECM: On the Chevrolet Trax, the ECM is typically located in the engine bay, often near the battery or firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new ECM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Power: Reattach the negative battery terminal.
- Final Steps: In some cases, a Crankshaft Position System Variation Learning Procedure may need to be performed with a capable scan tool to ensure optimal performance and prevent certain trouble codes. The vehicle will start and run without this, but for perfect operation, it is recommended.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12668866 and is interchangeable with several other part numbers, offering broad compatibility across the GM lineup. Please verify your vehicle is on this list:
CHEVROLET:
CRUZE 12-14 (1.4L), CRUZE 15 (Gasoline), CRUZE 16 (VIN P, Limited), ELR 14-16, EXPRESS 2500/3500 VAN 16 (4.8L, 6.0L), SILVERADO 2500/3500 PICKUP 12-16 (6.0L), SONIC 12-16, SPARK 14-15 (Gasoline), SUBURBAN 3500 16, TRAX 13-16, VOLT 11-15
BUICK:
ENCORE 13-16 (1.4L)
GMC:
SAVANA 2500/3500 VAN 16 (4.8L, 6.0L), SIERRA 2500/3500 PICKUP 12-16 (6.0L), SIERRA DENALI 2500/3500 12-16 (6.0L)
Frequently Asked Questions
What do I need to do after I purchase this ECM?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We use this to load the correct, factory-updated software onto the module before we ship it to you. This ensures it’s a perfect match for your vehicle’s configuration.
Is this part truly plug-and-play?
Because we program it to your VIN, it is as close to plug-and-play as possible. It will start and run the vehicle upon installation. However, for 100% optimal performance, some vehicles may require a Crankshaft Position Variation Relearn procedure using a compatible scan tool to clear potential codes and fine-tune engine operation.
Where can I find my VIN?
Your Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard, visible through the windshield.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601, P0606, etc.), then yes, this will resolve the issue. It is always best to have your vehicle properly diagnosed to confirm the ECM is the point of failure before ordering.
My original part number is 12643636. Will this work?
Yes. This ECM, part number 12668866, is a direct replacement for several part numbers, including 12643636. We list all compatible interchange numbers in the fitment section for your reference.