Restore Peak Performance to Your GM Vehicle
Is your GMC Savana, Chevy Express, or other GM truck or van suffering from perplexing issues like a persistent check engine light, erratic idling, stalling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, orchestrating critical functions like fuel delivery, spark timing, and emissions control. When it falters, your vehicle’s reliability and performance suffer dramatically. This replacement ECM, part number 12633238, is the definitive solution to get your workhorse back on the road and running smoothly.
The Plug-and-Play Advantage: VIN-Programmed for Your Vehicle
Don’t waste time and money on a trip to the dealership for expensive programming. We take the hassle out of the repair process. Before this module ships, our technicians will flash it with the latest official GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once you receive the part, it’s ready for a straightforward installation. It will communicate seamlessly with your vehicle’s other modules, restoring the original factory performance and efficiency you depend on.
From the Diagnostic Bay
We recently had a 2012 Express 3500 work van towed in. The complaint was intermittent stalling, but only after it had been running for over an hour on hot days. There were no stored trouble codes, making it a diagnostic nightmare. After verifying fuel pressure and sensor data, we suspected the ECM was failing internally due to heat soak. We installed a VIN-programmed module like this one, and the problem was solved instantly. The driver was back on the job the same day, saving his business from costly downtime.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason
- ✔ Noticeable decrease in fuel economy
- ✔ The vehicle cranks but refuses to start
- ✔ Unpredictable automatic transmission shifting behavior
- ✔ Inability for diagnostic scan tools to communicate with the module
- ✔ Performance issues like hesitation or lack of power
Your Direct-Fit Savana 2500 ECM Solution
This module is a direct replacement for OEM part numbers 12633238 and 12633055. It fits a wide range of popular GM trucks, vans, and performance cars from 2010 to 2017, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Camaro, and Corvette. By providing your VIN upon purchase, you guarantee that you receive a component perfectly configured for your vehicle’s specific engine, transmission, and options. This is not a generic, one-size-fits-all part; it’s a tailored solution for a lasting repair.
Installation is typically straightforward. Simply disconnect the battery, locate and unbolt the old ECM, disconnect the wiring harnesses, and install the new unit in its place. After reconnecting the battery, some vehicles may require a simple security relearn procedure, which can often be completed in your driveway without any special tools. Restore your vehicle’s brain and get back to confident driving.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming involves loading your vehicle’s specific factory software and calibration files onto the ECM. This ensures the computer knows your engine size, transmission type, tire size, and other options, allowing it to function perfectly as the manufacturer intended.
Do I need to do anything after I install this part?
In most cases, this is a plug-and-play installation. However, some GM vehicles may require a security relearn procedure (often called Passlock or Passkey) to allow the vehicle to start. This procedure can typically be done without special tools and instructions are widely available online.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number. We cannot program and ship your ECM without it. You can find your VIN on your vehicle’s dashboard (visible through the windshield) or on your registration and insurance documents.
Will this fix my specific problem?
This ECM will resolve issues directly caused by a faulty engine computer. While the symptoms listed are common indicators of ECM failure, it’s always recommended to have a proper diagnosis performed by a qualified mechanic to rule out other potential causes like sensor or wiring problems.
Is this part compatible with my vehicle even if it’s not a Savana 2500?
Yes, this ECM fits a very wide range of GM vehicles. Please review the detailed fitment list on this page to confirm compatibility with your specific year, make, model, and engine option. Matching the part number is the most reliable way to ensure a correct fit.