2017-2018 Sierra Denali Engine Control Module ECM 12686382 | VIN Programmed

Restore Peak Performance to Your GM Truck or SUV

Is your 2017-2018 Sierra Denali, Silverado, Tahoe, or other compatible GM vehicle suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic symptoms of a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, the entire vehicle’s performance and reliability are compromised.

This direct-fit Engine Control Module, part number 12686382, is the definitive solution to get your vehicle back in top form. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using your VIN. This ensures it has the latest GM-certified software and calibrations, making the installation process as straightforward as possible.

Is Your Truck Showing Signs of ECM Failure?

A faulty ECM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine’s computer may be the culprit:

• ✔ Check Engine Light (CEL) is on with various trouble codes.
• ✔ Engine cranks but refuses to start.
• ✔ Unexplained drops in fuel economy.
• ✔ The engine runs rough, misfires, or stalls unexpectedly.
• ✔ Hesitation or stumbling during acceleration.
• ✔ Automatic transmission shifts erratically or harshly.
• ✔ Communication errors with diagnostic scan tools.

The Direct-Fit Solution: A Programmed Sierra Denali Engine Control Module

Don’t settle for a generic, unprogrammed module that will require expensive dealer intervention. Our process is designed for efficiency and accuracy. When you order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash this genuine GM-spec ECM with the exact software your vehicle requires. This critical step ensures all onboard systems recognize the new module, restoring factory performance and functionality.

This module is a direct replacement for several part numbers, including 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. By consolidating these numbers, we ensure you receive the correct, updated hardware for your application.

Installation and Required Procedures

Physically installing the ECM is typically a simple bolt-on, plug-in process. However, modern vehicles have sophisticated anti-theft systems. After installation, you or your mechanic must perform a Vehicle Theft Deterrent (VTD) relearn procedure. This synchronizes the new ECM with your vehicle’s security system and keys. Without this step, the vehicle will not start.

This procedure requires a professional-grade scan tool with access to GM’s TIS2Web or Techline Connect software. Additionally, other specific setups like a crankshaft position variation relearn or injector flow rate programming may be necessary depending on your exact vehicle configuration. These are standard procedures for any professional technician replacing a modern ECM.

Verified Vehicle Compatibility

This part will fit these makes and models with these options:

• ESCALADE 17 Electronic Control Module; (engine compartment)
• ESCALADE ESV 17 Electronic Control Module; (engine compartment)
• XTS 17 Electronic Control Module; (3.6L), VIN 8 (8th digit, opt LF3)
• TAHOE 17 Electronic Control Module; (LH front engine compartment)
• YUKON 17 Electronic Control Module; (LH front engine compartment)
• CTS 17 Electronic Control Module; 6.2L (supercharged)
• CORVETTE 17 Electronic Control Module; (RH cowl under dash)
• SIERRA 1500 PICKUP 16 Electronic Control Module; (LH front engine compartment), ID 12674472
• SUBURBAN 1500 17 Electronic Control Module; (LH front engine compartment)
• SILVERADO 1500 PICKUP 16 Electronic Control Module; (LH front engine compartment), ID 12674472
• CTS 17 Electronic Control Module; 3.6L, VIN 8 (8th digit, opt LF3, twin turbo)
• SIERRA 1500 PICKUP 17 Electronic Control Module; (LH front engine compartment)
• YUKON XL 1500 17 Electronic Control Module; (LH front engine compartment)
• SIERRA DENALI 1500 17 Electronic Control Module; (LH front engine compartment)
• ATS 17 Electronic Control Module; (LH engine compartment), 3.6L, VIN Y (8th digit, opt LF4)
• SILVERADO 1500 PICKUP 17 Electronic Control Module; (LH front engine compartment)
• SIERRA 1500 PICKUP 18 Electronic Control Module; (LH front engine compartment), ID 12686382
• SIERRA DENALI 1500 18 Electronic Control Module; (LH front engine compartment), ID 12686382
• SILVERADO 1500 PICKUP 18 Electronic Control Module; (LH front engine compartment), ID 12686382