Restore Your Vehicle’s Brainpower and Performance
Is your GM truck, van, or performance car suffering from baffling engine problems? Issues like a persistent check engine light, rough idling, stalling, or a no-start condition often point to a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, orchestrating everything from fuel injection and spark timing to transmission shifts and emissions control. When it falters, the entire vehicle’s performance and reliability are compromised.
This replacement Engine Control Module, part number 12633055 (also compatible with 12633238), is the definitive solution to get your vehicle running correctly again. We take the guesswork and high dealership costs out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM-certified software specific to your vehicle’s configuration. This ensures seamless integration and restores the precise operational parameters your engine was designed for.
From the Diagnostic Bay
We had a 2012 Sierra 1500 in the shop with an intermittent stalling issue that was driving the owner crazy. It would run fine for days, then suddenly die at a stoplight. No consistent codes were being stored, just a few random communication faults. After checking all the usual suspects—fuel pump, sensors, wiring—we hooked up a scope to the injector driver circuits on the ECM. We found that the driver for cylinder 3 was intermittently dropping out when the module got hot. A new, correctly programmed ECM solved the problem instantly. It’s a reminder that these complex electronic modules can fail in ways that don’t always throw a clear diagnostic code.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine stalling or shutting off unexpectedly
- ✔ Rough or erratic idle
- ✔ Noticeable decrease in fuel economy
- ✔ Vehicle entering ‘limp mode’ with reduced power
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
Why Choose Our Programmed ECM 12633055?
Choosing the right replacement part is critical. Our Programmed ECM 12633055 offers a reliable and cost-effective path back to factory performance. We handle the complex programming, so you don’t have to pay for expensive tools or dealership labor. The module arrives at your door ready for installation. In most cases, a simple security relearn procedure (which you can often do yourself) is all that’s needed to finalize the installation. By using your VIN, we ensure all factory options and calibrations are correctly loaded, from engine and transmission specs to emissions equipment, providing a true plug-and-play repair.
This module is a direct replacement for a vast range of popular GM vehicles, including the Silverado, Sierra, Camaro, Corvette, Express, Savana, Tahoe, Yukon, and Escalade. Please verify your part number and consult the detailed fitment list to ensure compatibility with your exact model and year.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to load the exact, factory-correct software for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and performance, eliminating the need for further programming at a dealership.
Is this ECM difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new one, you will likely need to perform a security relearn procedure, which can often be done without special tools. Instructions are widely available online for this process.
What is a security relearn or anti-theft relearn?
This is a simple procedure that syncs the new ECM with your vehicle’s anti-theft system and keys. It usually involves a sequence of turning the key to the ‘ON’ position for about 10-15 minutes, then off, and repeating this two more times. This tells the vehicle to accept the new module.
Will this part fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty ECM, then this part will resolve the issue. However, it’s crucial to properly diagnose the problem first, as other failing sensors or components can also trigger a check engine light.
Is this a new or used part?
This is a high-quality, genuine OEM part that has been thoroughly tested to ensure it meets or exceeds original factory specifications. It is then programmed with the latest software for your vehicle to provide reliable, long-lasting service.