Is Your Silverado 2500 Running Rough?
If your 2012-2016 Silverado 2500 is suffering from perplexing issues like a persistent check engine light, poor fuel economy, stalling, or a no-start condition, the problem may lie with a failing Engine Control Module (ECM). The ECM is the central computer of your truck, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose.
This is a direct-fit replacement Engine Control Module, part number 12668866, for your truck. We take the guesswork out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that it has the latest GM-certified software and communicates perfectly with all other systems in your truck, restoring its original performance and reliability.
From the Diagnostic Bay
We had a 2014 Silverado 2500 with the 6.0L V8 come into the shop. The owner had already replaced the throttle body, mass air flow sensor, and all eight spark plugs chasing an intermittent stalling issue and a P0606 (ECM Processor Fault) code. The truck would run fine for days, then suddenly die at a stoplight. After confirming all power and ground circuits to the module were solid, we knew the internal processor of the original ECM was the culprit. We installed one of our VIN-programmed modules, performed the security relearn, and the truck has been running flawlessly ever since. It’s a classic case where chasing sensors can cost more time and money than addressing the root cause: the vehicle’s main computer.
Solving Your Engine Problems with a 2012-2016 Silverado ECM
A faulty ECM doesn’t just affect performance; it can leave you stranded. Our VIN-programmed modules are the most reliable and straightforward solution to get your truck back in service. By providing us with your Vehicle Identification Number (VIN) during checkout, we ensure the unit arrives ready for installation, loaded with the correct software calibration for your specific engine, transmission, and emissions equipment. This eliminates the need for expensive trips to the dealership for programming.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, misfiring, or running rough.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Difficulty starting or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
Simple Installation Process
Once you receive your pre-programmed module, the physical installation is straightforward. It is typically located in the front, left-hand side of the engine compartment. After swapping the hardware, you may need to perform a simple security relearn procedure, also known as the ‘key-on/key-off’ method, which can be done in your driveway without any special tools. This procedure pairs the new ECM to your vehicle’s anti-theft system. Instructions for this are readily available online or can be provided upon request.
Cross-Reference Part Numbers:
This module is a direct replacement for a wide range of GM part numbers, ensuring broad compatibility. It replaces: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. Please verify one of these numbers on your original module to guarantee fitment.
While this listing is focused on the 2012-2016 Silverado ECM, this versatile module also fits an extensive list of other GM vehicles, including the Sierra 2500/3500, Express/Savana vans, Cruze, Sonic, and more. Your VIN is the key to ensuring we load the precise software for your exact make and model.
Frequently Asked Questions
Do I need to send my old ECM (core) back?
No core charge or return is required for this part. You can keep your old module.
Is this ECM difficult to install?
The physical installation is typically simple, involving disconnecting the battery and swapping the module. The only additional step is a security relearn procedure, which can be done by the owner without special tools in most cases.
What information do you need from me?
After your purchase, we require your 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct, updated GM software for your truck’s specific configuration.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM, then yes, this part will resolve the issue. It’s crucial to ensure that the codes are not being caused by other faulty sensors or wiring before replacing the ECM.
What if my part number isn’t listed?
Please contact us with your vehicle’s VIN and the part number from your original module. We can verify compatibility and ensure you receive the correct part for your application.