Is Your Truck Down? Get Back to Work with a Ready-to-Install Solution.
A failing Engine Control Module (ECM) in your Sierra, Silverado, or Express van isn’t just an inconvenience—it’s a roadblock. When your truck is your livelihood, downtime is lost money. If you’re dealing with a no-start condition, a persistent check engine light, or bizarre electrical issues that defy diagnosis, the problem often lies with the vehicle’s brain. This Programmed 12670335 Engine Control Module is the definitive, reliable fix to get your workhorse back on the road and running strong, without the excessive cost and scheduling headaches of a dealership.
Common Symptoms & Your Solution
A faulty ECM can manifest in numerous frustrating ways. You might be experiencing:
- Complete no-start or intermittent starting problems
- Check Engine Light (CEL) with communication-related codes (like U0100)
- Poor engine performance, hesitation, or stalling
- Reduced fuel economy
- Erratic automatic transmission shifting
- Issues with other electronic modules that rely on the ECM
Instead of chasing symptoms, address the root cause. We take the guesswork out of the equation by providing a high-quality ECM that is professionally programmed with the latest GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This isn’t just a part; it’s a complete, ready-to-install solution.
Features & Tangible Benefits
- ✔ VIN-Specific Programming Included: Your module arrives ready for installation. There’s no need for an expensive trip to the dealer for programming, saving you significant time and money.
- ✔ Loaded with Latest GM Updates: We flash the unit with the most current factory software, ensuring optimal engine performance, fuel efficiency, and transmission function.
- ✔ Direct-Fit Replacement: Engineered to be a direct replacement for a wide range of original part numbers, including 12668866, 12668994, 12643636, and more, guaranteeing a perfect fit.
- ✔ Plug-and-Play Installation: Once installed, your vehicle will start and run correctly. In most cases, a security relearn procedure may be required, which is a simple process you can often do yourself.
- ✔ Restored Drivability: Eliminate the frustrating performance issues and error codes caused by a failing computer, restoring the power and reliability you depend on.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Diagnostics
As a technician, one of the most challenging issues on these GM trucks is a ‘no-communication’ fault with the ECM. You can spend hours, and hundreds of dollars, checking wires and other modules only to find the ECM itself is the culprit. A pre-programmed module is the most efficient repair. By providing us with your VIN, you’re getting a part that’s not only mechanically correct but electronically identical to what the dealer would install, letting you bypass the diagnostic rabbit hole and get straight to the solution. This is how the pros get trucks back in service quickly.
This Programmed 12670335 Engine Control Module is the smart choice for owners who value their time and need their vehicle to perform flawlessly. Simply provide your VIN after purchase, and we’ll handle the complex programming. We ship you a component that’s ready to restore your vehicle’s core functionality.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot program and ship the module without this information, so please provide it promptly to avoid delays.
Will I need to do anything else after installation?
While the module is programmed to your vehicle, you may need to perform a security relearn procedure (also known as a CASE relearn or anti-theft relearn). This syncs the new ECM to your vehicle’s security system and can typically be done without special tools. Instructions are widely available online for your specific model.
Is this compatible if my old part number is different?
Yes. This ECM, part number 12670335, is the correct service replacement for several other part numbers, including 12668866, 12668994, 12643636, 12663405, and more as listed in the description. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.
What does ‘programmed with the newest updates’ mean?
Over the life of a vehicle, manufacturers like GM release software updates to improve things like fuel economy, transmission shifting, and emissions performance. We ensure your replacement ECM is loaded with the very latest software available for your specific VIN, giving you benefits you might not have had with your old unit.
What if I have questions during installation?
While we cannot provide vehicle-specific repair advice, we are here to support the product itself. We recommend installation be performed by a qualified technician. However, if you have questions about the programming or the module, please contact us.