Restore Peak Performance and Reliability to Your GM Truck or SUV
Is your 2017 Yukon XL 1500 acting up? Experiencing frustrating issues like random stalling, a persistent Check Engine Light, poor fuel economy, or a complete no-start condition? As a technician with over 20 years in the bay, I’ve seen these exact symptoms hundreds of times, and they often point directly to a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, and when it falters, the entire system suffers. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.
We offer a straightforward, dependable solution. This genuine GM Engine Control Module, part number 12704476, is the correct replacement for your vehicle. The best part? We take the biggest hassle out of the equation. Before we ship it, we program the module with the latest GM software calibrations specifically for your vehicle using the VIN you provide. This means you get a component that’s ready for the final installation steps, saving you a costly trip and programming fee at the dealership. Get your truck back to running the way it was designed to.
Case Study: A Tricky Diagnosis
I remember a 2017 Sierra 1500 that came into my shop with a bizarre, intermittent no-start problem. The owner had already replaced the battery and starter. We scanned it and found a U0100 (Lost Communication with ECM) code that would only appear when the engine was hot. After hours of tracing wires, we found the ECM itself was failing internally under heat soak. We replaced it with a pre-programmed unit just like this one. After a quick crankshaft variation relearn, the truck started perfectly every time. This simple part solved a problem that had stumped others for weeks.
Is Your Vehicle Showing These Telltale Signs?
A failing ECM can manifest in various ways. If you’re noticing any of the following, it’s a strong indicator that the brain of your engine needs attention. Confirming your diagnosis is the first step to a successful repair.
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601, P0606, or U0100.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable drop in fuel efficiency.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Erratic transmission shifting behavior.
A Straightforward Guide to Your ECM Installation
Replacing your 2017 Yukon XL 1500 ECM is a manageable job for an experienced DIYer or any professional technician. Following these steps will ensure a smooth process. Please note the critical post-installation procedures.
- 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, the ECM is found in the left-hand (driver’s side) front of the engine compartment. Consult a service manual for your specific model if unsure.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical harnesses securely, ensuring they click and lock into position.
- Reconnect Battery: Re-attach the negative battery terminal.
- CRITICAL – Theft Deterrent Relearn: Attempt to start the vehicle. If it does not start, you MUST perform a Vehicle Theft Deterrent System (VTDS) relearn. This procedure requires a GM-specific scan tool or access to GM’s TIS2Web/Techline Connect service. This is the responsibility of the installer.
- Additional Relearns: Depending on your vehicle, other procedures like a Crankshaft Position Variation Relearn or injector flow rate programming may be necessary to clear all codes and ensure optimal performance.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your vehicle and options below. This part replaces several original part numbers, including 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815.
- Cadillac ATS: 2017 (3.6L, VIN Y, LF4)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8, LF3)
- Cadillac Escalade / ESV: 2017
- Cadillac XTS: 2017 (3.6L, VIN 8, LF3)
- Chevrolet Corvette: 2017
- Chevrolet Silverado 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- Chevrolet Suburban 1500: 2017
- Chevrolet Tahoe: 2017
- GMC Sierra 1500 / Denali 1500: 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- GMC Yukon / Yukon XL 1500: 2017
Frequently Asked Questions
Do I need to program this ECM?
No. We handle the initial programming for you. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the correct, updated software from GM before shipping.
What is a “theft relearn” and why do I need it?
The Vehicle Theft Deterrent System (VTDS) links your vehicle’s key, ignition, and ECM. When you install a new ECM, the system sees it as a potential theft and prevents the engine from starting. The relearn procedure re-establishes this security handshake. It requires a professional scan tool with GM software access (like Techline Connect).
Is this a used or repaired part?
This is a high-quality, tested, and verified genuine GM part guaranteed to function correctly. It is not a repaired or rebuilt unit.
What if my original part number is slightly different but my vehicle is on the list?
This ECM is a direct replacement for multiple part numbers, including 12692068, 12686382, and others listed. As long as your vehicle model and year are listed in the compatibility chart, this module is the correct fit.
Who is responsible for the additional relearn procedures?
The end-user or installer is responsible for performing the theft relearn and any other necessary setup procedures like the crankshaft variation relearn. We provide the correctly programmed part; the final vehicle-specific integration must be completed upon installation.