Restore Peak Performance to Your GM Vehicle
Is your truck or van running rough, stalling unexpectedly, or flashing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the computer that serves as your vehicle’s brain. This replacement ECM, part number 12692200, is the definitive solution to restore your vehicle’s factory performance, fuel efficiency, and reliability. We take the guesswork and high dealership costs out of the equation. Before we ship, we will program the module with the latest official GM software, specifically matched to your vehicle’s VIN. This ensures a seamless, plug-and-play installation process, getting you back on the road with confidence.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2014 Silverado 2500 with the 6.0L V8 that came into my shop with a problem that was driving the owner crazy. It would randomly stall at low speeds and sometimes refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a few sporadic U0100 (Lost Communication with ECM) history codes. We checked all the usual suspects: battery, alternator, grounds, and the wiring harness to the ECM. Everything looked pristine. On a hunch, I gently tapped the ECM housing with a rubber mallet while the engine was idling. The engine stumbled immediately. That confirmed it—an internal fault in the module was causing an intermittent open circuit. Swapping in a pre-programmed ECM like this one solved the problem instantly. It’s a reminder that not all electronic failures throw a clear code; sometimes, it’s about understanding the component’s failure points.
Is Your GM Vehicle Showing These Red Flags?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need. This is especially true if you have scanned for codes and found DTCs like P0601, P0606, or U0100.
- âś” Engine stalling or misfiring for no apparent reason
- âś” Difficulty starting the engine or a complete no-start condition
- âś” A noticeable decrease in fuel economy
- âś” Poor or erratic automatic transmission shifting
- âś” The Check Engine Light is illuminated and won’t go away
- âś” Loss of power and sluggish acceleration
- âś” Communication errors with diagnostic scan tools
A Straightforward Guide to Installation
Installing your new 2012-2016 Sierra Denali 3500 ECM is a manageable job for a DIYer with basic tools. Following these steps ensures a safe and effective replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the Module: On most Sierra, Silverado, and Express/Savana models, the ECM is located in the engine compartment, typically on the driver’s side near the fender or firewall.
- Disconnect the Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old ECM. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
- Remove the Old ECM: Unbolt the mounting hardware that secures the old module to the vehicle. Keep the bolts and any brackets safe, as you may need to reuse them.
- Install the New ECM: Mount your new, pre-programmed ECM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click into place. Reconnect the negative battery terminal. Your vehicle is now ready to start.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. Please verify your specific model and options below. This part replaces several original part numbers, including 12668866, 12668994, 12643636, and 12692200.
Trucks & SUVs
- âś” Sierra/Silverado 2500/3500 (2012-2016): 6.0L Engine
- âś” Sierra Denali 2500/3500 (2012-2016): 6.0L Engine
- âś” Suburban 3500 (2016)
- âś” Buick Encore (2013-2016): 1.4L Engine
- âś” Chevy Trax (2013-2016): 1.4L Engine
Cars & Vans
- âś” Chevy Spark (2014-2015): Gasoline models
- âś” Cadillac ELR (2014-2016)
- âś” Chevy Volt (2011-2015)
- âś” Express/Savana Van 2500/3500 (2016): 4.8L or 6.0L Engine
Frequently Asked Questions
Frequently Asked Questions
Do I need to program this module after I receive it?
No. This is the biggest benefit of our service. We program the ECM to your vehicle’s specific VIN using the latest GM software updates before it ships. It arrives ready for installation, with no extra trips to a mechanic or dealer required.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is crucial for us to load the correct software for your exact model, year, and options.
Where is the ECM located on my 2012-2016 Sierra Denali 3500?
On the 2012-2016 Sierra and Silverado HD trucks, the Engine Control Module is typically found in the engine bay, mounted on the driver’s side inner fender, near the air filter box.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM (Engine Control Module) traditionally managed only the engine. PCM (Powertrain Control Module) manages both the engine and the transmission. For most modern GM vehicles, including yours, this single unit functions as the PCM, but it is commonly called an ECM.
Will this fix my Check Engine Light?
If the Check Engine Light is on due to an internal failure of the original ECM (common codes P0601-P0606), then yes, this replacement part will resolve the issue once installed. If the light is on for another reason (e.g., a bad oxygen sensor), that separate issue will still need to be addressed.