Is Your Sierra Denali Experiencing Frustrating Engine Problems?
If you’re dealing with a persistent check engine light, a no-start condition, erratic engine performance, or false sensor codes, a failing Engine Control Module (ECM) is often the culprit. As the central computer for your truck’s powertrain, its health is critical. In my 20+ years in the shop, I’ve seen countless vehicles sidelined by faulty ECMs, leaving owners with a reliable truck that simply won’t run right. This isn’t just an inconvenience; it’s a complex diagnostic headache. You need a solution that is both reliable and straightforward.
A Real-World Scenario from My Shop
“A customer’s 2017 Sierra 1500 came in last week with a baffling intermittent no-start. All the vitals—battery, starter, fuel pressure—checked out perfectly. The scan tool showed a loss of communication with the ECM, but only sometimes. After hours of tracing wires, we swapped in a known-good ECM, and the truck fired up instantly. The original module had an internal failure on one of the main processor circuits, a common issue I’ve seen on dozens of these GM platforms. Replacing the module was the only correct fix.”
The Direct Solution: A VIN-Programmed 2017-2018 Sierra Denali Engine Control Module
Forget the high costs and scheduling delays at the dealership. We provide a dependable Engine Control Module, part number 12674472, that arrives at your door programmed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures that the computer is perfectly matched to your truck’s specific configuration and options.
- ✔ VIN Programmed & Ready: We handle the complex programming for you, loading the correct GM calibration for your exact vehicle.
- ✔ Restores Peak Performance: Eliminates issues caused by a faulty computer, such as poor fuel economy, hesitation, and shifting problems.
- ✔ Clears Stubborn DTCs: A direct fix for a wide range of engine and communication-related Diagnostic Trouble Codes.
- ✔ Broad Compatibility: This module is a direct replacement for multiple part numbers, ensuring a perfect match.
Important Installation & Relearn Procedures
While this module is programmed to your VIN, modern vehicle security systems require a final handshake procedure after installation. This is a standard part of the repair process.
- Safety First: Disconnect the negative battery terminal and wait 15 minutes for the system capacitors to discharge.
- Locate and Replace: The ECM is typically located in the engine compartment on the driver’s side. Carefully disconnect the electrical harnesses and unbolt the old module. Install the new module and reconnect everything securely.
- Reconnect Battery: Re-attach the negative battery terminal.
- Vehicle Theft Deterrent System (VDS) Relearn: THIS IS A CRITICAL STEP. If the vehicle does not start after installation, you or your mechanic will need to perform a VDS relearn. This procedure requires a GM-compatible scan tool with access to their programming software (e.g., Tis2web/Techline Connect). This synchronizes the new ECM with your vehicle’s anti-theft system.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary to ensure optimal performance. These are also performed with a professional scan tool.
Please Note: The responsibility for performing these post-installation relearn procedures lies with the end-user or their certified mechanic. We guarantee the ECM is correctly programmed to your VIN; you are responsible for the final vehicle integration.
Guaranteed Fitment & Part Number Compatibility
This Engine Control Module is a direct replacement for the following part numbers: 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815.
It is confirmed to fit the following vehicles:
- 2017 Cadillac Escalade & Escalade ESV
- 2017 Cadillac XTS (3.6L Twin Turbo LF3)
- 2017 Cadillac CTS (6.2L Supercharged & 3.6L Twin Turbo LF3)
- 2017 Cadillac ATS (3.6L LF4)
- 2017 Chevrolet Corvette
- 2017 Chevrolet Tahoe & Suburban 1500
- 2016-2018 Chevrolet Silverado 1500
- 2016-2018 GMC Sierra 1500 & Sierra Denali 1500
- 2017 GMC Yukon & Yukon XL 1500