Programmed 2012-2016 Silverado 2500 ECM 12663405 | VIN Matched & Ready

Restore Your Truck’s Brain and Get Back on the Road

Is your Silverado 2500 acting up? Unexplained stalling, a persistent check engine light, or erratic engine behavior can often be traced back to a failing Engine Control Module (ECM). As the central computer of your truck, a faulty ECM can cause a cascade of frustrating and hard-to-diagnose problems. With over 20 years of hands-on diagnostic experience, I’ve seen how a failing module can sideline even the toughest trucks. This isn’t just a replacement part; it’s a direct solution designed to restore your vehicle’s reliability and performance.

This is a genuine OEM replacement 2012-2016 Silverado 2500 ECM that comes fully programmed to your truck’s specific Vehicle Identification Number (VIN). We handle the complex part for you. By flashing the module with the latest official GM software updates before it ships, we eliminate the need for an expensive trip to the dealership. This means no extra programming fees or special scan tools are required for installation. It’s a straightforward, effective fix for the professional mechanic or the dedicated DIYer.

Is Your Silverado HD Showing These Signs?

A failing ECM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer may need replacement:

• ✔ Persistent Check Engine Light (CEL) that won’t clear.
• ✔ Engine stalling, stumbling, or hesitating for no apparent reason.
• ✔ Complete no-start condition where the engine cranks but won’t fire.
• ✔ Noticeable decrease in fuel economy and poor engine performance.
• ✔ Transmission shifting issues or harsh engagement.
• ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0606, or U0100 pointing to internal module failure or communication loss.

A Straightforward Guide to Installation

Installing your new 2012-2016 Silverado 2500 ECM is a manageable job for anyone with basic tools. Since it arrives pre-programmed, you skip the hardest part. Just follow these steps:

1. Safety First: Always disconnect the negative terminal from your truck’s battery and secure it away from the post.
2. Locate the ECM: On these Silverado and Sierra HD trucks, the ECM is typically found in the front of the engine bay on the driver’s side, near the fender and airbox.
3. Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
4. Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
5. Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts.
6. Reconnect Everything: Plug the electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
7. Final Step: Turn the key to the ‘ON’ position (without starting) for 10-15 seconds before starting the engine. This allows the other vehicle modules to recognize the new ECM. Your truck is now ready to drive.

Verified Vehicle Compatibility

This ECM is a direct replacement for multiple part numbers and fits a wide range of General Motors vehicles. Please verify your part number or match your vehicle from the list below. This unit is compatible with part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.