Programmed 2014-2016 Sierra 1500 ECM 12672963 | VIN Matched

Restore Your Truck’s Performance and Reliability

As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can bring a powerful truck like your 2014-2016 Sierra 1500 to a dead stop. It’s the brain of your engine, and when it malfunctions, you can experience a host of frustrating issues, from a persistent check engine light and poor fuel economy to a no-start condition that leaves you stranded. Don’t let a faulty computer dictate your truck’s performance. This genuine GM ECM is the definitive solution to get you back on the road with confidence.

We take the guesswork and high dealership costs out of the equation. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest GM factory software, specifically matched to your vehicle using your VIN. This ensures all engine, transmission, and emissions parameters are set correctly for a seamless installation and immediate performance restoration. This is the same level of precision you’d get from a dealer, without the hefty bill for programming and labor.

Is Your Sierra Showing These Red Flags?

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

• ✔ Persistent Check Engine Light (CEL)
• ✔ Engine stalling, stumbling, or running rough
• ✔ Vehicle won’t start or has a crank-no-start issue
• ✔ Noticeable decrease in fuel mileage
• ✔ Poor acceleration or loss of power
• ✔ Communication error codes stored, such as U0100
• ✔ Internal module failure codes like P0601, P0603, or P0606

A Straightforward Guide to Installation

Installing your new 2014-2016 Sierra 1500 ECM is a manageable job for a confident DIYer. Following these steps will ensure a smooth process.

1. Safety First: Always disconnect the negative terminal from your truck’s battery before beginning any electrical work.
2. Locate the ECM: On the Sierra 1500, the ECM is typically found in the LH (driver’s side) front of the engine compartment.
3. Disconnect the Harnesses: 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 and remove it from the vehicle.
5. Install the New Module: Bolt your new, pre-programmed ECM into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
6. Reconnect Battery: Re-attach the negative battery terminal.
7. Perform Security Relearn: In many cases, you will need to perform a simple security relearn procedure (often called a ‘key-on/key-off’ cycle) to sync the new ECM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require special tools. Instructions are readily available online or in your owner’s manual.

Verified Vehicle Compatibility

This module is a direct replacement for part number 12672963 and is also compatible with several other part numbers. It is guaranteed to fit the following GM vehicles, among others. Please verify your part number or contact us with your VIN to confirm.