Is Your Sierra Denali Running Rough, Stalling, or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems in your 2017-2018 Sierra Denali 1500โlike erratic idling, poor fuel economy, a no-start condition, or persistent diagnostic trouble codes (DTCs) that won’t go awayโa failing Engine Control Module (ECM) is a very likely culprit. The ECM is the brain of your truck’s engine, and when it malfunctions, it can cause a cascade of issues that leave you stranded. Don’t let a faulty computer keep your powerful truck sidelined. This is the reliable, straightforward solution you need.
The Smart Solution: A VIN-Programmed ECM
Forget the hassle and high cost of a dealership visit. We simplify the repair process by providing a high-quality replacement ECM, part number 12678815, that is professionally programmed specifically for your truck. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our technicians will flash the module with the latest, most stable GM-approved software calibrations for your exact vehicle configuration. This ensures perfect communication between the ECM and all other vehicle systems.
Expert Pro Tip: Check This Before You Order
In my 20+ years of diagnostics, I’ve seen countless ECMs get replaced unnecessarily. Before you condemn your module, do a simple check. On these GM trucks, the main engine-to-chassis ground strap can corrode or break. It’s often a braided strap located near the front of the engine block. A poor ground connection can cause bizarre electrical issues that perfectly mimic a failed ECM, including communication errors and random warning lights. A quick visual inspection and cleaning of this connection can sometimes save you hundreds of dollars and a lot of diagnostic headaches.
Why Choose Our Pre-Programmed 2017-2018 Sierra Denali 1500 ECM?
- โ VIN-Specific Programming: We load the correct GM software for your truck’s engine, transmission, and options, ensuring optimal performance.
- โ Solves Common Problems: Effectively resolves issues like false sensor codes, harsh shifting, communication loss with scan tools, and intermittent stalling.
- โ Latest Software Updates: Your module arrives with the newest GM calibrations, which often include fixes for drivability and emissions that your old module may lack.
- โ Direct-Fit Replacement: This unit is a direct physical and electrical match for the original, making the physical swap straightforward.
Installation & Security Relearn Procedure
Physically installing this module is simple for a DIYer or any professional mechanic. However, it’s critical to understand the final step. After installation, your truck’s anti-theft system (Pass-Key III, Passlock, or GM VTD) needs to recognize the new ECM.
- Safety First: Disconnect the negative battery terminal.
- Locate the ECM: On most Sierra/Silverado models, it’s in the left-hand (driver’s side) front of the engine compartment.
- Disconnect & Remove: Carefully unplug the electrical connectors (they have locking tabs) and unbolt the old module.
- Install New ECM: Bolt the new module in place and securely reconnect the electrical harnesses.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: If the vehicle does not start, a Vehicle Theft Deterrent (VTD) relearn must be performed. This procedure requires a professional-grade scan tool with access to GM’s programming software (such as TIS2WEB or Techline Connect). This synchronizes the new ECM with your truck’s security system.
Please Note: The responsibility for performing the VTD relearn, as well as any other necessary procedures like a crankshaft position variation relearn or injector flow rate programming, lies with the installer. This is a standard procedure for this type of repair.
Guaranteed Compatibility
This ECM is a direct replacement for the following part numbers:
12692068, 12704476, 12686382, 12674052, 12674472, 12678815
It is designed to fit a wide range of GM vehicles, including:
- 2017-2018 Sierra 1500 / Sierra Denali 1500
- 2017-2018 Silverado 1500
- 2017 Escalade / Escalade ESV
- 2017 Tahoe / Suburban 1500
- 2017 Yukon / Yukon XL 1500
- And select 2017 Cadillac ATS, CTS, and XTS models with specific engines.
Verify your part number to ensure a perfect match. Restore your truck’s reliability and performance by ordering today!