2015-2016 Tahoe Engine Module 12663391 | Programmed to Your VIN

As a technician with over two decades of experience under the hood, I’ve seen firsthand the frustration a failing Engine Control Module (ECM) can cause in a 2015-2016 Chevy Tahoe. It’s the brain of your vehicle, and when it starts to falter, you get unpredictable stalling, a persistent check engine light, and performance that just isn’t right. You’re not just buying a part; you’re buying a solution to get your trusted SUV back on the road with confidence.

This isn’t just a generic, off-the-shelf computer. This is a direct-fit Engine Control Module, part number 12663391, that we professionally program to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This critical step ensures complete compatibility with your Tahoe’s systems. We load it with the latest, most stable software updates directly from GM, which often resolve underlying drivability issues the original software might have had. This means no expensive trip to the dealership for programming—a savings of both time and money.

Is Your Tahoe Showing These Signs?

A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs:

• ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
• ✔ Your engine cranks but refuses to start.
• ✔ Unexplained drops in fuel economy.
• ✔ The engine runs rough, misfires, or stalls unexpectedly.
• ✔ Automatic transmission shifts harshly or at the wrong times.
• ✔ Loss of communication with the scan tool or other modules (U-codes).
• ✔ Your vehicle is in “limp mode,” with reduced power.

The Benefits of a Pre-Programmed 2015-2016 Tahoe Engine Module

Choosing our VIN-programmed module provides a significant advantage for both professional installers and DIY mechanics. You receive a component that is truly ready for installation, eliminating the need for specialized, expensive programming tools. This ensures that all factory settings, from the anti-theft system (VATS) to transmission shift points, are correctly calibrated for your specific vehicle, restoring original performance and reliability.

Your Straightforward Installation Guide

1. ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
2. ✔ Locate the ECM: On your 2015-2016 Tahoe, the ECM is found in the front of the engine compartment on the driver’s side (LH side), typically near the air filter housing.
3. ✔ Disconnect and Remove: Carefully unplug the electrical connectors. There are usually locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
4. ✔ Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical connectors, ensuring they click securely into position.
5. ✔ Reconnect Battery: Reattach the negative battery terminal.
6. ✔ Perform Security Relearn: You will need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new ECM to sync with your vehicle’s anti-theft system. Consult your owner’s manual for the exact procedure for your vehicle.

Verified Vehicle Compatibility

This module is a direct replacement for part number 12663391 and is also compatible with part numbers 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12672963, and 12669318. It fits a wide range of GM vehicles, including: