Restore Your Vehicle’s Core Performance and Reliability
Is your GM vehicle plagued by frustrating electrical issues, a persistent check engine light, or unpredictable performance? A failing Engine Control Module (ECM) is often the culprit, acting as the vehicle’s brain and controlling everything from fuel mixture to transmission shifting. This replacement Programmed 12633055 Engine Control Module is the definitive solution to get your truck, SUV, or performance car running like new again. We take the guesswork and hassle out of the repair by programming the unit specifically to your vehicle’s VIN before it ever leaves our facility.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty ECM is the likely cause. This module is designed to resolve these exact problems:
- Persistent Check Engine Light (CEL) with codes like P0601, P0606, or other internal processor faults.
- Unexplained stalling or rough idling.
- Difficulty starting the engine or a complete no-start condition.
- Poor fuel economy and noticeable loss of power.
- Erratic transmission shifting or communication errors with other modules.
By replacing your old unit with this professionally programmed module, you are restoring the central command system of your vehicle to its optimal factory specifications.
Features & Benefits
- ✔ Arrives Ready for Installation: We program this module to your vehicle’s specific VIN, ensuring it communicates perfectly with your existing systems right out of the box.
- ✔ Updated with the Latest GM Software: Your ECM will be flashed with the most current GM-released calibrations for your vehicle, often improving performance and efficiency over the original.
- ✔ Guaranteed OEM Compatibility: A direct replacement for part numbers 12633055 and 12633238, guaranteeing a perfect fit and function across a wide range of GM models.
- ✔ Cost-Effective Dealer Alternative: Avoid the high costs and scheduling delays associated with dealership programming and repair. This is a direct, efficient solution.
- ✔ Drive with Confidence: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
In modern vehicles, the ECM is more than just a part; it’s a security hub. It’s tied to your specific vehicle’s VIN, immobilizer system, and unique option set. Simply swapping a used module from another vehicle won’t work—the car won’t start. Our pre-programming service handles this critical step for you. We write your vehicle’s unique identity into the module, which dramatically simplifies the installation process. While a security relearn procedure may still be required (a simple process you can often do yourself), the core programming is done, saving you hundreds of dollars and a trip to the dealer.
This Programmed 12633055 Engine Control Module is the most reliable way to solve complex electronic issues and restore the dependable performance you expect from your vehicle. Simply provide your VIN after purchase, and we’ll handle the rest.
Frequently Asked Questions
How does the programming process work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this VIN to access the latest official GM software for your specific make, model, and year. We then flash this software onto the ECM, ensuring it is perfectly matched to your vehicle’s requirements before we ship it.
Will I need to do anything after installing the ECM?
In many cases, you may need to perform a simple security relearn procedure, also known as a key relearn or anti-theft relearn. This process syncs the new ECM with your vehicle’s keys and can typically be done without special tools. Instructions are widely available online for specific models. Some vehicles may also require a Crankshaft Variation (CASE) relearn, which requires a capable scan tool.
How do I know if this part will fit my vehicle?
This ECM is a direct replacement for original part numbers 12633055 and 12633238. Please check the extensive fitment list on this page. The most important step is to verify the part number on your current ECM. If it matches one of these numbers, this unit is the correct replacement.
What is the difference between part numbers 12633055 and 12633238?
These are interchangeable service numbers from GM. Functionally, they are the same component and our programming ensures they will work identically in any vehicle that calls for either part number. You can confidently order this module if your vehicle requires either 12633055 or 12633238.
What if my original part number is not listed?
It is crucial to match the part number from your original ECM. If your number is different, this module may not be compatible. Please contact us with your vehicle’s VIN and original part number, and our experts can assist you in finding the correct component for your needs.