Restore Peak Performance to Your GM Vehicle
Is your Chevrolet or Pontiac suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are common indicators of a failing Engine Control Module (ECM), the central computer responsible for managing your engine’s performance. This direct-fit ECM, part number 12636386, is the reliable, straightforward solution to get your vehicle running smoothly again. It arrives at your door fully programmed to your specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership programming and ensuring a simple, plug-and-play installation.
From the Diagnostic Bay
We had a 2012 Chevy Sonic come into the shop with a ghost of a problem. The owner complained of random stalling at stoplights, but there were no consistent trouble codes. We checked fuel pressure, sensors, and wiring, but everything seemed fine. On a hunch, we monitored the live data stream from the ECM and noticed the injector pulse width would erratically drop to zero just before a stall. We swapped in a known-good, programmed ECM, and the problem vanished instantly. The original module had an internal fault that only appeared under specific thermal conditions. It’s a perfect example of how a failing ECM can cause baffling issues that a simple replacement can solve.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Unexplained decrease in fuel efficiency
- ✔ Engine misfires, stumbles, or runs rough
- ✔ Intermittent or complete failure to start
- ✔ Hesitation or lack of power during acceleration
- ✔ Erratic or harsh automatic transmission shifting
- ✔ Inability for diagnostic scan tools to communicate with the module
Why Choose Our Programmed Chevy Trax ECM?
This isn’t just a part; it’s a complete solution. The biggest hurdle in replacing a modern ECM is the complex vehicle-specific programming required for it to function. We handle that for you. Using the VIN you provide at checkout, we load the latest GM-certified software and calibrations directly onto the module. This ensures that the ECM communicates perfectly with your vehicle’s other systems—from the transmission to the anti-lock brakes—right out of the box. You get a component that performs to original factory specifications, restoring lost power, efficiency, and reliability.
Simple, VIN-Matched Programming Process
Our process is designed for simplicity and accuracy:
- Place Your Order: Add this ECM to your cart and complete the checkout process.
- Provide Your VIN: After your purchase, reply to your order confirmation email with your 17-digit VIN. This is critical for us to program the module correctly.
- We Program & Ship: Our technicians will flash the module with the precise software for your vehicle. We then ship the ready-to-install part directly to you.
Guaranteed Fitment & Compatibility
This module is a direct replacement for several original equipment part numbers and fits a wide range of GM vehicles. Please verify that your vehicle is on the list below and that your original part number is a match.
Compatible Part Numbers: 12679199, 12642927, 12636386, 12621466, 12630789
This part will fit these makes and models with these options:
- CHEVROLET CRUZE: 2011-2012 (1.8L)
- CHEVROLET AVEO: 2009-2011
- CHEVROLET SPARK: 2013
- CHEVROLET TRAX: 2013-2014 (1.8L)
- CHEVROLET SONIC: 2012 (1.8L)
- PONTIAC G3: 2009-2010
- PONTIAC WAVE: 2009-2010
Frequently Asked Questions
Why do I need to provide my VIN?
Your VIN (Vehicle Identification Number) is essential because it allows us to load the exact software and calibrations your specific vehicle requires. This includes settings for the engine, transmission, emissions equipment, and other options, ensuring a seamless, error-free installation.
Is any additional programming required after I install it?
No. This ECM comes fully programmed and ready for installation. In most cases, a security relearn procedure may be required, which can typically be done without special tools and instructions can be found online or in a service manual. This syncs the new ECM with your vehicle’s anti-theft system.
How can I be sure my ECM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed by a qualified mechanic. They can rule out other potential causes like faulty sensors, wiring issues, or fuel delivery problems before you replace the module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original ECM, then yes, this replacement part will resolve the issue. However, if the light is on due to a problem with another component (like an oxygen sensor or catalytic converter), that issue will still need to be addressed.
What tools are needed for installation?
Installation is typically straightforward and requires basic hand tools, such as a socket set and ratchet, to disconnect the battery and unbolt the old ECM. Always disconnect the negative battery terminal before beginning any work.