Restore Peak Performance to Your GM Vehicle
Is your truck or car suffering from baffling issues like a persistent check engine light, poor fuel mileage, rough idling, or even a no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine performance, fuel delivery, and emissions. A faulty ECM can create a cascade of problems that are often difficult and expensive to diagnose. This pre-programmed ECM, part number 12670335, is the definitive solution to restore your vehicle’s factory performance and reliability.
The Brain of Your Engine, Restored
The ECM is arguably the most critical component in your modern vehicle. It processes data from dozens of sensors in real-time to precisely control fuel injection, ignition timing, and transmission shifting. When it begins to fail, the symptoms can be intermittent and confusing. You might replace sensors and other components only to find the problem persists. Our service eliminates the guesswork by providing a quality-tested module programmed specifically for your vehicle’s unique Vehicle Identification Number (VIN). We install the latest, most stable software updates from GM, which often correct underlying drivability issues you may not have even known were software-related. This isn’t just a replacement; it’s a comprehensive fix.
From the Diagnostic Bay
We had a 2014 Silverado 2500 with the 6.0L V8 come in with a complaint of intermittent stalling at stoplights and a P0606 (Internal Control Module Processor Error) code that would come and go. The owner had already replaced the throttle body and crankshaft position sensor with no luck. After verifying all power and ground circuits to the ECM were solid, we knew the module itself was the culprit. A failing internal processor was causing the random shutdowns. We installed one of our VIN-programmed modules, performed the quick security relearn procedure, and the truck ran perfectly. The customer was thrilled to have his dependable workhorse back without spending another dime on unnecessary parts.
Is Your ECM Failing? Common Symptoms
- ✔ Persistent or flashing Check Engine Light (CEL)
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Rough or unstable engine idle
- ✔ Hesitation or stumbling during acceleration
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
Why Choose Our VIN-Programmed Sierra Denali 3500 ECM?
When you order this Sierra Denali 3500 ECM, you’re getting more than just a part. You’re getting a plug-and-play solution designed for reliability. We take your vehicle’s VIN and program the module to match the exact factory specifications and options it was built with. This critical step ensures all systems—from the engine and transmission to the anti-lock brakes and security system—communicate correctly. An improperly programmed module can cause more problems than it solves. We handle the complex programming on our end, so you receive a part that is ready for installation and a final security relearn procedure.
This module is a direct replacement for multiple GM part numbers, including 12668866, 12668994, 12643636, 12663405, 22819494, and 12692200, ensuring broad compatibility across a wide range of GM trucks, vans, and cars. Please verify your part number and check the extensive fitment list to confirm this is the correct component for your vehicle.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for programming the ECM correctly. The VIN contains specific information about your vehicle’s engine, transmission, emissions systems, and factory-installed options. We use it to load the exact GM-certified software your vehicle needs to run properly, ensuring seamless integration and performance.
Is this part truly ‘plug and play’?
For the most part, yes. The module arrives programmed for your vehicle’s engine and transmission operation. However, after installation, you will likely need to perform a security relearn procedure, also known as a ‘key relearn’ or ‘anti-theft relearn’. This procedure syncs the new ECM with your vehicle’s existing keys and security system. It can often be done without special tools and instructions can be found online, or a mechanic with a capable scan tool can perform it in minutes.
Will this fix my check engine light?
If the check engine light and associated diagnostic trouble codes (DTCs) are caused by a faulty ECM, then yes, this will resolve the issue. It’s crucial to properly diagnose the problem first. If the light is on due to a bad sensor or wiring issue, replacing the ECM will not fix the underlying problem.
What if I install it and my vehicle still doesn’t start?
First, ensure the security relearn procedure has been completed successfully, as the anti-theft system will prevent the engine from starting if it’s not synced. Second, double-check all electrical connections to the ECM, and verify that your battery is fully charged and the terminals are clean. A weak battery can prevent the module from operating correctly.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit VIN. We cannot program and ship your module until we receive this information. The fastest way to get your part is to provide the VIN immediately after ordering.