Restore Peak Performance to Your GM Vehicle
Is your 2017 GMC Yukon or other compatible GM truck suffering from baffling electrical issues, poor performance, or a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can wreak havoc. It’s the central computer of your vehicle, and when it starts to go, you’ll notice problems like rough idling, stalling, decreased fuel economy, or even a no-start condition. This isn’t just an inconvenience; it’s a critical component for your vehicle’s safety and reliability.
This direct-fit 2017 Yukon Engine Control Module, part number 12704476, is the definitive solution. We take the guesswork and dealership hassle out of the equation. Before we ship, our experts will program the module with the latest official GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between the ECM and all other systems in your truck, restoring the precise engine management it had from the factory.
Case Study: A Tricky Diagnosis
A customer brought in their 2017 Sierra 1500 with a complaint that stumped two other shops: intermittent stalling at red lights and a random collection of communication error codes (U-codes). The truck would run fine for days, then suddenly die. After checking the usual suspects—battery, alternator, and grounds—I focused on the ECM. Using a scope, I noticed a voltage drop within the module’s internal processor under load, a classic sign of internal failure. Replacing the ECM with a pre-programmed unit like this one solved the problem instantly. The key was having a module flashed with the correct, updated software for that specific VIN, which prevented any new communication conflicts.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or erratic engine idling and stalling.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Problems with automatic transmission shifting.
- ✔ Communication errors with other vehicle modules.
Your Straightforward Installation Guide
Installing your new 2017 Yukon Engine Control Module is a manageable job for a confident DIYer or a quick task for any professional mechanic. Follow these steps carefully for a successful installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the ECM: On most compatible trucks and SUVs like the Yukon and Tahoe, the ECM is found in the engine compartment on the driver’s side (LH side).
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harnesses from the old module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New ECM: Mount your new, pre-programmed ECM securely onto the bracket.
- Reconnect Everything: Plug the wiring harnesses firmly back into the new module, ensuring the locking tabs click into place. Reconnect the negative battery terminal.
- Perform Relearn Procedures: This step is critical. The vehicle will likely not start until a Vehicle Theft Deterrent System (VTDS) relearn is performed using a compatible GM diagnostic tool (like TIS2Web/Techline Connect). Other procedures, such as a crankshaft position variation relearn, may also be necessary to ensure optimal performance. This is the responsibility of the installer.
Verified Vehicle Compatibility
This module is a guaranteed fit for a wide range of GM vehicles. It is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. Please confirm your vehicle is on the list below:
- Cadillac ATS (2017): 3.6L (VIN Y, LF4)
- Cadillac CTS (2017): 3.6L Twin Turbo (VIN 8, LF3) or 6.2L Supercharged
- Cadillac Escalade / ESV (2017)
- Cadillac XTS (2017): 3.6L (VIN 8, LF3)
- Chevrolet Corvette (2017)
- Chevrolet Silverado 1500 (2016-2018)
- Chevrolet Suburban (2017)
- Chevrolet Tahoe (2017)
- GMC Sierra 1500 / Denali 1500 (2016-2018)
- GMC Yukon / Yukon XL (2017)
Frequently Asked Questions
Do I need to send my old ECM to you?
Do I need to send my old ECM to you?
No core charge or return is required. This is a direct purchase, saving you time and shipping costs.
What information do you need from me?
After you complete your purchase, you MUST provide us with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Will my truck start immediately after installation?
In most cases, no. You or your mechanic will need to perform a Vehicle Theft Deterrent System (VTDS) relearn. This security procedure syncs the new ECM to your vehicle and is a standard step for this repair.
Can I install this myself?
The physical installation is straightforward. However, the final relearn procedures require a professional scan tool with GM software capabilities (like Techline Connect). We recommend this part for experienced DIYers with the right tools or for professional installation.
Is this a brand new part?
This is a high-quality, tested, and verified component that is guaranteed to function to OEM specifications. We program it with the newest software available from GM for your specific vehicle.
What if I have other part numbers?
This ECM, part 12704476, also replaces part numbers 12692068, 12686382, 12674052, 12674472, and 12678815. If your module has one of these numbers, this part is the correct fit.