Restore Your Truck’s Performance and Reliability
Is your 2016-2018 GMC Sierra 1500 running rough, throwing confusing check engine lights, or refusing to start? A failing Engine Control Module (ECM) is often the culprit behind these frustrating and complex issues. As the brain of your vehicle, the ECM governs everything from fuel injection and ignition timing to transmission shifts and emissions control. When it falters, the symptoms can be unpredictable and difficult to diagnose. This direct-fit replacement Sierra 1500 Engine Module is the definitive solution to restore your truck’s factory performance and get you back on the road with confidence.
We take the guesswork out of the repair. Unlike a generic module from a parts store, each unit we ship is professionally programmed with the latest GM-certified software specifically for your truck. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our experts will flash the module to match your vehicle’s exact configuration. This critical step ensures seamless communication between all vehicle systems, preventing the compatibility errors that plague un-programmed modules.
Case Study: A Tricky Diagnosis
I had a 2017 Sierra 1500 come into my shop with a bizarre set of problems. The owner complained of intermittent stalling at stoplights, a transmission that seemed to hunt for gears, and a check engine light that would come and go. His previous mechanic had replaced two sensors with no luck. After hooking up my scan tool, I saw a cascade of communication errors (U-codes) alongside a P0606 (ECM/PCM Processor Fault). Experience has taught me that when multiple, seemingly unrelated systems act up simultaneously, the central controller is the first place to look. We swapped in a VIN-programmed ECM, performed the security relearn, and the truck ran perfectly. It’s a classic example of how a single faulty Sierra 1500 Engine Module can mimic a dozen other problems, making a quality, pre-programmed part essential for an accurate fix.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
- ✔ Vehicle will not start or has trouble starting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough idling, engine stalling, or misfires.
- ✔ Transmission shifting issues or erratic behavior.
- ✔ Apparent loss of engine power and poor acceleration.
- ✔ Problems with other electronic systems due to communication loss.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the ECM: On most 2016-2018 Sierra 1500 models, the ECM is located in the engine compartment on the driver’s side (LH front).
- ✔ Disconnect and Remove: Carefully unplug the wiring harness connectors. Be gentle with the locking tabs. Then, unbolt the old module from its mounting bracket and remove it.
- ✔ Install the New Module: Mount the new, pre-programmed ECM in the same location. Securely reconnect all wiring harnesses, ensuring they click into place.
- ✔ Reconnect Battery: Re-attach the negative battery terminal.
- ✔ Perform Relearn Procedures: This is a critical final step. The vehicle’s security system must be synchronized with the new ECM. This is known as a “Vehicle Theft Deterrent Relearn” and requires a GM-compatible scan tool with access to TIS2Web or Techline Connect. Additional procedures like a crankshaft variation relearn may also be necessary. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module, part number 12674052, is a direct replacement for several original equipment part numbers including 12692068, 12704476, 12686382, 12674472, and 12678815. It is guaranteed to fit the following vehicles:
- ✔ 2016-2018 GMC Sierra 1500 / Sierra Denali 1500
- ✔ 2016-2018 Chevrolet Silverado 1500
- ✔ 2017 Cadillac Escalade / Escalade ESV
- ✔ 2017 Chevrolet Tahoe / Suburban 1500
- ✔ 2017 GMC Yukon / Yukon XL 1500
- ✔ 2017 Cadillac ATS (3.6L LF4)
- ✔ 2017 Cadillac CTS (6.2L Supercharged or 3.6L LF3 Twin Turbo)
- ✔ 2017 Cadillac XTS (3.6L LF3)
- ✔ 2017 Chevrolet Corvette
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN is essential for us to program the module with the correct software and calibrations for your specific engine, transmission, and options. This ensures it works perfectly right out of the box, avoiding compatibility issues.
What is a “theft relearn” and can I do it myself?
The theft relearn procedure synchronizes the new ECM with your vehicle’s anti-theft system. Without it, the truck will not start. This process requires a professional-grade scan tool with access to GM’s software (TIS2Web/Techline Connect). Most DIYers will need to have a qualified mechanic or dealership perform this step after installation.
Will this fix my check engine light?
If the check engine light and performance issues are caused by a faulty ECM (e.g., codes P0601, P0606), this part is the correct solution. However, you must ensure the root cause of the failure has been properly diagnosed. This module will not fix issues caused by other faulty sensors or mechanical problems.
Is this a simple plug-and-play part?
The physical installation is straightforward—it plugs right in. However, the mandatory security relearn and potential for other setup procedures (like crankshaft variation) mean it is not fully “plug-and-play.” Professional-level tools are required to complete the job correctly.
What other part numbers does this replace?
This module is a direct-fit replacement for part numbers 12692068, 12704476, 12686382, 12674472, and 12678815, covering a wide range of GM trucks and performance vehicles.