Restore Your Truck’s Heartbeat and Performance
As a technician with over two decades of experience under the hood, I know the frustration that comes with a vehicle you can’t rely on. When your Sierra 3500 starts acting up—stalling unexpectedly, running rough, or flashing a stubborn Check Engine Light—the problem often points to a failing Engine Control Module (ECM). This isn’t just a component; it’s the brain of your engine, managing everything from fuel injection to spark timing. A faulty ECM can cripple your workhorse, leaving you stranded and costing you time and money.
This replacement Engine Control Module is the definitive solution to get your truck back in prime condition. We take the biggest headache out of the repair process: programming. Simply provide your vehicle’s VIN at checkout, and our experts will flash this module with the latest, most stable GM software specific to your truck. It arrives at your door ready for a straightforward installation, saving you a costly trip to the dealership and the hassle of complex programming procedures.
Case Study: The Intermittent No-Start
I once had a 2014 Sierra 3500 in my bay that was baffling its owner, a local contractor. The truck would randomly refuse to start, but only after it was warm. No codes were stored consistently, just a few random communication errors that would disappear. We checked the battery, starter, and fuel pump—all were fine. After hours of tracing wiring diagrams, we focused on the ECM. On a hunch, we monitored the ECM’s internal temperature and processor activity. We discovered the processor was failing under heat soak. We replaced it with a pre-programmed module just like this one. The truck fired up every single time afterward, and the contractor was back on the job site the next day. This isn’t just a part; it’s a reliable fix for those ghost-in-the-machine problems.
Is Your Truck Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL), especially with codes like P0601, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Unexpected stalling or engine hesitation while driving.
- ✔ Noticeable decrease in fuel efficiency and power.
- ✔ Erratic automatic transmission shifting behavior.
- ✔ Failure to communicate with diagnostic scan tools.
A Straightforward Guide to Your ECM Installation
Replacing your 2012-2016 Sierra 3500 Engine Control Module is a job most DIYers can handle with basic tools. Follow these steps to get your truck running smoothly again.
- Safety First: Always begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On most GMT900 and K2XX trucks, the ECM is located in the engine bay, on the driver’s side near the fender or firewall.
- Disconnect Wiring: Carefully release the locking tabs on the large electrical connectors and pull them straight out from the module. Take a moment to inspect the pins for any signs of corrosion or damage.
- Remove Old ECM: Unbolt the old module from its mounting bracket. It’s typically held in by a few bolts (commonly 10mm or 13mm).
- Install New ECM: Mount your new, VIN-programmed module in place and tighten the bolts. Re-insert the wiring harness connectors, making sure they click securely into place.
- Finalize the Job: Reconnect the negative battery terminal. In some cases, a security relearn procedure is necessary. This can often be done by cycling the key and can be completed in your driveway. Start the engine and confirm the check engine light is off and the engine runs smoothly.
Will This Fit My Vehicle?
This ECM, part number 12692200, is a direct replacement for a wide range of General Motors vehicles. While it is the correct 2012-2016 Sierra 3500 Engine Control Module for models with the 6.0L gas engine, it also fits the following applications. Please verify your original part number or contact us with your VIN to confirm compatibility.
Compatible Models:
BUICK ENCORE 13-16
CADILLAC ELR 14-16
CHEVROLET CRUZE 12-16
CHEVROLET EXPRESS 2500/3500 VAN 16 (4.8L, 6.0L)
CHEVROLET SILVERADO 2500/3500 PICKUP 12-16 (6.0L)
CHEVROLET SONIC 12-16
CHEVROLET SPARK 14-15
CHEVROLET SUBURBAN 3500 16
CHEVROLET TRAX 13-16
CHEVROLET VOLT 11-15
GMC SAVANA 2500/3500 VAN 16 (4.8L, 6.0L)
GMC SIERRA 2500/3500 PICKUP 12-16 (6.0L)
GMC SIERRA DENALI 2500/3500 12-16 (6.0L)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the ECM with the exact software and calibrations your specific vehicle requires. This ensures perfect compatibility with your engine, transmission, and other systems, making the installation truly plug-and-play.
Is this part difficult to install?
For most individuals with basic mechanical skills and common hand tools, this is a straightforward installation. As outlined in our guide, the process involves disconnecting the battery, swapping the module, and reconnecting everything. The pre-programming we perform eliminates the most difficult step.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the ECM (common codes include P0601-P0606), then yes, this part is the correct fix. However, it’s always best to have the codes professionally diagnosed to ensure the ECM is the root cause and not a separate sensor or wiring issue.
What is a security relearn?
A security relearn, or anti-theft relearn, syncs the new ECM with your vehicle’s anti-theft system. On many GM vehicles, this is a simple procedure that involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. It does not typically require a special scan tool.