Restore Your GM Vehicle’s Performance and Reliability
Is your truck, SUV, or performance car suffering from baffling electrical issues, a persistent check engine light, or poor engine performance? A failing Engine Control Module (ECM) is often the culprit, leaving you stranded and frustrated. This genuine GM Engine Control Module, part number 12633055, is the definitive, hassle-free solution to get your vehicle back on the road. The best part? It arrives at your door fully programmed to your vehicle’s specific VIN, eliminating the need for an expensive trip to the dealership for programming.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty ECM is the likely cause. This module is the direct fix for:
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U-codes.
- Engine stalling, stumbling, or misfiring.
- No-start or intermittent starting conditions.
- Poor fuel economy and reduced engine power.
- Erratic transmission shifting or behavior.
- Other seemingly unrelated electrical issues.
Installing our Programmed 12633055 ECM for Sierra 1500 and other compatible GM vehicles restores the critical link between your engine’s sensors and its operating systems, bringing back the smooth, reliable performance you depend on.
Features & Benefits
- ✔ Plug & Play Installation: This ECM is pre-flashed with the latest GM software using your VIN. No dealership visit or special tools are required for programming.
- ✔ Peak Performance Restored: With up-to-date calibrations, your engine will regain its original power, efficiency, and responsiveness.
- ✔ OEM Direct Replacement: Guaranteed to fit and function perfectly, this unit replaces part numbers 12633055 and 12633238, ensuring seamless integration with your vehicle’s systems.
- ✔ Cost-Effective Solution: Save hundreds of dollars in dealership programming fees and diagnostic time with a unit that’s ready to install right out of the box.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
As a technician with over 20 years of experience, I can’t stress this enough: simply swapping an ECM from another vehicle will not work. Modern vehicles use the ECM to manage everything from the engine and transmission to the anti-theft system (VATS). Each module is coded to a specific VIN. Our programming service isn’t just a convenience—it’s essential. We ensure the module we send you is a perfect digital match for your vehicle, preventing immobilization issues and ensuring all systems communicate correctly from the moment you turn the key.
Frequently Asked Questions
Is this ECM truly plug-and-play?
Yes. Because we program the module to your specific VIN before shipping, it is ready to be installed without any further programming. In some cases, a simple crankshaft variation relearn procedure may be required, which can be done with many common scan tools.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as it is required for the programming process.
Will this fix my specific problem or check engine light?
This module will correct issues directly caused by a faulty ECM. While it resolves many common DTCs, it’s crucial to ensure your vehicle’s problem has been properly diagnosed. This part will not fix underlying mechanical or wiring issues.
What’s the difference between part numbers 12633055 and 12633238?
These are interchangeable OEM part numbers for the same hardware. As long as your original module is one of these two numbers, our unit will be a correct replacement once programmed to your vehicle.
Do I need to send my old ECM (core) back?
No core charge or return is required for this purchase. You can keep or responsibly dispose of your old module.