Restore Peak Performance to Your GM Vehicle
Is your truck or SUV suffering from baffling electrical gremlins, poor fuel economy, or a frustrating no-start condition? The Engine Control Module (ECM), the vehicle’s central computer, is often the root cause. When it fails, it can create a cascade of problems that are difficult to diagnose. This isn’t just a replacement part; it’s a direct solution. We provide a genuine GM Engine Control Module, part number 12674472, that comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN) with the latest factory software. This eliminates the expensive and time-consuming trip to the dealership for programming, getting you back on the road faster.
A Technician’s Notebook: The Ghost in the Machine
I recall a 2017 Sierra 1500 that came into my bay with a laundry list of complaints from the owner: intermittent stalling at red lights, hard starting, and a check engine light that would come and go. The codes were all over the place—a random misfire, an O2 sensor code, and even a transmission communication fault. A less experienced tech might have started throwing parts at it. But after 20 years, you learn to spot the pattern. When multiple, seemingly unrelated systems are acting up, the first place I look is the central command: the ECM. We confirmed with a scope that the module’s 5-volt reference was dropping out intermittently. Swapping in a pre-programmed 2017 Escalade Engine Control Module like this one (it’s a common part across the platform) and performing the security relearn solved every single issue instantly. The ‘ghost’ was just a faulty computer.
Is Your GM’s Brain Failing? Common Symptoms
A failing ECM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs.
- ✔ Check Engine Light is illuminated with communication-related Diagnostic Trouble Codes (DTCs) such as U0100, P0601, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable loss of power, hesitation, or stumbling during acceleration.
- ✔ A significant and sudden drop in fuel mileage.
- ✔ Harsh or erratic shifting from the automatic transmission.
- ✔ Stalling for no apparent reason, either while driving or at idle.
Your Straightforward Installation Path
Installing your new ECM is a manageable job for a confident DIYer or any professional technician. We handle the complex programming; you handle the installation and final setup. Please note the critical final steps.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the ECM: On most GM trucks and SUVs like the Escalade, Tahoe, and Sierra, the ECM is located in the engine compartment on the driver’s side, near the firewall or fuse box. On vehicles like the Corvette, it may be under the dash on the passenger side.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that must be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- CRITICAL – Security Relearn: The vehicle will likely NOT start at this point due to the anti-theft system. You or your mechanic MUST perform a Vehicle Theft Deterrent (VTD) relearn using a GM-specific diagnostic tool with access to TIS2Web or Techline Connect.
- Additional Setups: Depending on your vehicle, other procedures like a Crankshaft Position Variation relearn may be necessary to ensure optimal performance. This is the responsibility of the installer.
Verified Compatibility for Your Vehicle
This module is a direct-fit replacement for a wide range of General Motors vehicles. It replaces part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. Please verify your vehicle is on the list below.
- CADILLAC ATS 2017 (3.6L, VIN Y)
- CADILLAC CTS 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8)
- CADILLAC ESCALADE & ESCALADE ESV 2017
- CADILLAC XTS 2017 (3.6L, VIN 8)
- CHEVROLET CORVETTE 2017
- CHEVROLET SILVERADO 1500 PICKUP 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- CHEVROLET SUBURBAN 1500 2017
- CHEVROLET TAHOE 2017
- GMC SIERRA 1500 & SIERRA DENALI 1500 2016 (ID 12674472), 2017, 2018 (ID 12686382)
- GMC YUKON & YUKON XL 1500 2017
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
What is a Vehicle Theft Deterrent (VTD) relearn?
The VTD relearn is a security procedure that syncs your new ECM to your vehicle’s ignition key and other security components. Without this step, the vehicle’s anti-theft system will prevent it from starting. This procedure requires a professional scan tool with GM software (TIS2Web/Techline Connect).
Can I perform the VTD relearn myself?
Unless you are a professional technician with access to GM’s subscription-based Techline Connect software, you will not be able to perform this procedure. Most customers have the installation and relearn performed by their trusted local repair shop.
What happens if I install the ECM without doing the relearn procedures?
The vehicle will not start. The security system will remain active until the VTD relearn is successfully completed. Additionally, without other potential relearns like the crankshaft variation, the engine may not run smoothly or efficiently.
Is this part difficult to install physically?
The physical installation is straightforward. It typically involves removing a few bolts and disconnecting electrical connectors. The main challenge is not the physical swap but ensuring the required post-installation electronic relearn procedures are performed correctly.
Does this part come with a warranty?
Yes, all our electronic modules are backed by a comprehensive warranty. We stand by the quality of our parts and programming service. Please refer to the warranty section for full details.