Restore Peak Performance to Your GM Truck or Van
Is your GMC Savana, Chevy Express, Silverado, or Sierra suffering from frustrating and unpredictable issues? A faulty Engine Control Module (ECM) is often the culprit behind problems like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition. The ECM is the brain of your vehicle, controlling everything from fuel mixture and ignition timing to transmission shift points. When it fails, the entire system suffers. This replacement Engine Control Module, part number 12633238 (interchangeable with 12633055), is the definitive solution to get your vehicle back on the road and running reliably.
The Plug-and-Play Solution Your Vehicle Needs
Forget expensive dealership visits and the hassle of finding a local shop with the right programming tools. We take the guesswork out of the repair. When you purchase this ECM, we flash it with the latest, most stable software updates directly from GM, programmed specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect communication between the ECM and all other modules in your vehicle, restoring its original performance and efficiency. It arrives at your door ready for installation.
From the Diagnostic Bay
We had a 2014 Express 3500 work van come into the shop with a complaint of intermittent stalling and a flashing check engine light. The driver said it would die at stoplights without warning, making his delivery route a nightmare. We scanned it and found a slew of communication error codes pointing towards a failing ECM. Instead of a lengthy and costly diagnostic process at the dealer, the owner opted for one of our VIN-programmed modules. We swapped it out in under an hour, performed the security relearn, and the van was back on the road the same day, running smoother than it had in years. This isn’t just a part; it’s a solution that minimizes downtime and gets you back to work.
Symptoms of a Failing GM ECM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling or shutting off unexpectedly
- ✔ Rough or inconsistent idling
- ✔ Noticeable decrease in fuel efficiency
- ✔ Hesitation or stumbling during acceleration
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Complete no-start or no-crank condition
- ✔ Communication errors with diagnostic scan tools
Why Choose Our 2010-2015 Savana 3500 ECM?
This module is the heart of your vehicle’s engine management system. Our process ensures you receive a fully functional component that integrates seamlessly with your vehicle. We handle the critical programming step, a service that dealerships often charge hundreds of dollars for. By providing us with your VIN at checkout, you guarantee that the module you receive is calibrated for your specific engine, transmission, and emissions equipment. This is the most reliable and cost-effective way to solve complex electronic issues and restore the dependability you expect from your GM vehicle.
Installation and Relearn Procedure
Physical installation is straightforward for anyone with basic mechanical skills. The ECM is typically located in the engine bay. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. After installation, a security relearn procedure (often called a CASE relearn or anti-theft relearn) may be required to sync the new ECM with your vehicle’s ignition keys and anti-theft system. This procedure can often be done without special tools and instructions are widely available online, or it can be completed by any qualified mechanic.
Frequently Asked Questions
What exactly is an ECM?
The Engine Control Module (ECM), also known as the Engine Control Unit (ECU), is a powerful computer that acts as the central command for your vehicle’s engine. It takes data from sensors all over the engine and uses it to control fuel injection, spark timing, and other critical functions to ensure optimal performance, fuel economy, and emissions.
Is this part truly plug-and-play?
Yes, for the most part. Because we program the module to your specific VIN before shipping, it eliminates the need for dealer-level programming. However, you may need to perform a simple, key-on/key-off security relearn procedure to sync the new ECM with your vehicle’s anti-theft system. This process typically does not require any special tools.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle. You can typically find your VIN on your dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
What if this doesn’t fix my problem?
While this ECM resolves a wide range of common issues, proper vehicle diagnosis is key. We recommend confirming the ECM is the point of failure before ordering. If you install the part and your issue persists, the problem may lie with another component, such as a sensor, wiring, or another module. We guarantee the functionality of the module itself.
Will this work for other GM models besides the Savana?
Absolutely. This ECM, part number 12633238, is a direct replacement for a vast number of GM trucks, vans, and performance cars from this era, including the Chevy Silverado, GMC Sierra, Tahoe, Yukon, Escalade, and even the Camaro and Corvette with specific engines. The key is that we program it specifically for the vehicle VIN you provide.