Restore Your Sierra’s Performance and Reliability
Is your 2014-2016 Sierra Denali 1500 suddenly giving you headaches? Maybe it’s a no-start condition that leaves you stranded, erratic shifting, a persistent Check Engine Light, or abysmal fuel economy. As a technician with over two decades of experience under the hood, I’ve seen these exact issues countless times. The culprit is often the Engine Control Module (ECM)—the sophisticated brain that manages everything from fuel injection and ignition timing to transmission control. When it fails, your powerful truck can feel unpredictable and unreliable.
Don’t let a faulty ECM keep you off the road or force you into an expensive trip to the dealership. This is a direct-replacement Engine Control Module (part number 12676230) that offers a simple, effective, and affordable solution. We take the guesswork and complexity out of the repair by pre-programming the module to your truck’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This means it arrives loaded with the latest GM factory software updates, ensuring optimal performance, fuel efficiency, and emissions compliance. It’s the same quality fix you’d get from a professional shop, made easy for the DIYer or independent mechanic.
Case Study: The Ghost in the Machine
A customer brought in his 2015 Sierra 1500 with a frustrating intermittent problem. It would randomly refuse to start, but then fire right up an hour later. He had multiple communication codes (U0100 – Lost Communication with ECM/PCM) and a P0606 (ECM/PCM Processor Fault). We checked all the wiring and grounds—they were perfect. Experience pointed straight to the ECM. The internal processor was failing intermittently, causing it to drop communication with the rest of the truck’s modules. Swapping in a pre-programmed ECM like this one resolved all the codes and the no-start condition instantly. It’s a classic failure mode for this platform.
Is Your Sierra Exhibiting These ECM Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention. This is especially true if you have diagnostic trouble codes (DTCs) pointing to internal module failure.
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Rough idling, stalling, or engine hesitation.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ Your scanner cannot communicate with the ECM.
- ✔ Apparent loss of engine power and poor acceleration.
A Straightforward Guide to Your ECM Installation
Replacing your 2014-2016 Sierra Denali ECM is a manageable job for a confident DIYer. By programming it for you, we’ve handled the most difficult part. After installation, you will need to perform a simple security relearn procedure, which does not require a special scan tool.
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the ECM: On most 2014-2016 Sierra/Silverado models, the ECM is located in the front of the engine compartment on the driver’s side, near the air filter box.
- Disconnect Connectors: Carefully release the locking tabs and unplug the electrical connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely fasten it.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click. Reconnect the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth cycle, the truck should start, completing the relearn process.
Verified Vehicle Compatibility List
This module is a guaranteed fit for a wide range of GM vehicles. Please verify your model and options below. This part is a direct replacement for part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318.
SILVERADO 1500 PICKUP 14-16
SIERRA 1500 PICKUP 14-16
TAHOE 15-16
SUBURBAN 1500 15-16
YUKON 15-16
YUKON XL 1500 15-16
ESCALADE & ESV 15-16
CAMARO 16 (6.2L)
CORVETTE 14-16
ATS 14-16 (3.6L)
CTS 14-16 (3.6L, 6.2L)
XTS 14-16 (3.6L)
CANYON 15-16 (3.6L)
COLORADO 15-16 (3.6L)
Frequently Asked Questions
Do I need to send my old ECM back (core charge)?
This purchase does not require a core return. You can keep your old module, though we always recommend recycling old electronics responsibly.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
Is any other programming required after I install it?
No. This ECM comes fully programmed with the latest GM software matched to your VIN. The only step required after installation is the security relearn procedure (also known as the key relearn), which is detailed in our installation guide and requires no special tools.
Will this fix my specific problem?
This module will correct issues directly caused by a failing ECM, such as internal processor faults (P0606) or communication failures. While it solves the most common problems, it’s essential to ensure your vehicle’s issues are not caused by other components like bad wiring, sensors, or fuel system parts. Proper diagnosis is key.
What is the warranty on this part?
This part comes with a standard warranty covering defects in the module itself. Please refer to our store’s warranty policy page for complete details on coverage and duration.