2017-2018 Sierra ECM Engine Control Module 12674052

Is Your GM Truck or SUV Experiencing Engine Problems?

If your 2017-2018 Sierra, Silverado, Tahoe, or other compatible GM vehicle is suffering from issues like a persistent Check Engine Light, erratic engine behavior, poor fuel economy, or a no-start condition, a failing Engine Control Module (ECM) could be the culprit. The ECM is the central computer of your vehicle’s powertrain, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a cascade of frustrating and potentially damaging problems.

This is a direct replacement Engine Control Module, part number 12674052, designed to restore your vehicle’s original performance and reliability. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using the VIN you provide. This means it arrives with the latest, most stable software updates directly from GM, ensuring optimal function right out of the box.

Diagnosing a Faulty 2017-2018 Sierra ECM

A failing engine computer can manifest in various ways, often overlapping with symptoms of other component failures. However, if you’re experiencing several of the following issues simultaneously, it’s a strong indicator that your ECM needs attention.

Common Symptoms of ECM Failure

• ✔ Check Engine Light: The most common sign, often with codes related to module communication (U-codes) or processor faults (P06xx codes).
• ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the ECM fails to properly control spark and fuel.
• ✔ No-Start Condition: The vehicle may crank but refuse to start because the ECM is not activating the fuel pump or ignition coils.
• ✔ Poor Performance & Fuel Economy: Inaccurate sensor readings or incorrect calculations by a faulty ECM can lead to a noticeable drop in power and an increase in fuel consumption.
• ✔ Transmission Shifting Problems: The ECM works with the Transmission Control Module (TCM) to ensure smooth shifts. A faulty ECM can cause harsh shifting, delayed engagement, or getting stuck in one gear.
• ✔ Intermittent Electrical Issues: Seemingly unrelated electrical problems can sometimes be traced back to a failing central computer.

The Solution: A VIN-Programmed Replacement

This isn’t just a part; it’s a complete solution. By providing your Vehicle Identification Number (VIN) during checkout, you ensure that the module you receive is a perfect match for your vehicle’s specific configuration. Our process includes flashing the unit with the correct factory calibrations and the most recent software updates available from General Motors. This eliminates the need for expensive and time-consuming programming at a dealership.

Important Installation Information

Please Note: While the core engine programming is completed by us, modern vehicles have sophisticated anti-theft systems. Upon installation, the vehicle may not start until a “Vehicle Theft Deterrent Relearn” procedure is performed. This procedure syncs the new ECM with your vehicle’s security system and keys. This is a standard step for this repair and is the responsibility of the installer. This relearn, along with any other necessary setups like a crankshaft variation relearn or injector flow rate programming, must be done using a professional GM diagnostic tool like Tis2web or Techline Connect.

Broad Compatibility

This module is a direct replacement for a wide range of popular GM trucks and SUVs. It is a valid substitute for the following part numbers:

• 12692068
• 12704476
• 12686382
• 12674052
• 12674472
• 12678815

It fits models such as the Cadillac Escalade, Chevrolet Tahoe, Suburban, Silverado, GMC Yukon, Sierra, and various Cadillac sedans. Please verify your part number and check the detailed fitment list to ensure compatibility.