Restore Peak Performance to Your GM Truck or SUV
Is your Silverado, Sierra, or Tahoe suffering from frustrating issues like a persistent check engine light, erratic shifting, poor fuel mileage, or a dreaded no-start condition? As a technician with over two decades of experience under the hood, I’ve seen these symptoms countless times. More often than not, the culprit is a failing Engine Control Module (ECM)—the computer that acts as your vehicle’s brain. When it falters, the entire system can descend into chaos. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded.
This Engine Control Module, part number 12674472, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures it arrives with the latest GM software updates, ready for installation. You’re not just buying a part; you’re getting a direct-fit, correctly calibrated component designed to restore your vehicle’s factory performance and efficiency.
Is Your Truck’s Brain on the Fritz? Common ECM Failure Signs
- ✔ Check Engine Light (CEL) is on with codes like P0601, P0606, or other internal processor faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or inconsistent engine idle.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ Communication errors with other modules (U-codes).
- ✔ Stalling for no apparent reason while driving or at a stop.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2017 Silverado 1500 that came into my shop with an issue that was driving the owner crazy. It would start and run perfectly for days, then suddenly refuse to start. No crank, no click, nothing. After a tow, it would start right up at the shop. We checked the battery, starter, and ignition switch—all were fine. The problem was intermittent and left no clear codes initially. After digging into the live data stream during one of its ‘episodes,’ we noticed the ECM wasn’t communicating properly. It was like a ghost in the machine. Replacing the original module with a quality, VIN-programmed 2016-2018 Silverado 1500 ECM solved the problem for good. That’s the kind of hard-to-diagnose issue a failing computer can cause.
Your Straightforward ECM Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the ECM: On most Silverado and Sierra models, the ECM is located in the engine compartment on the driver’s side, near the firewall or inner fender.
- ✔ Disconnect Connectors: Carefully release the locking tabs and unplug all electrical connectors from the old ECM. Avoid forcing them.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely re-fasten the bolts.
- ✔ Reconnect Everything: Plug all electrical connectors firmly into the new ECM until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Relearn Procedures: As noted, the vehicle may not start until a Vehicle Theft Deterrent System (VTDS) relearn is completed using a compatible scan tool with GM software (like TIS2WEB/Techline Connect). Other procedures, such as a crankshaft variation relearn, may also be necessary for optimal performance. This final step is the responsibility of the installer.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is confirmed to fit the following vehicles:
- ✔ 2016-2018 Chevrolet Silverado 1500
- ✔ 2016-2018 GMC Sierra 1500 / Sierra Denali 1500
- ✔ 2017 Cadillac Escalade / Escalade ESV
- ✔ 2017 Chevrolet Suburban 1500
- ✔ 2017 Chevrolet Tahoe
- ✔ 2017 GMC Yukon / Yukon XL 1500
- ✔ 2017 Cadillac ATS (3.6L LF4)
- ✔ 2017 Cadillac CTS (3.6L LF3 Twin Turbo / 6.2L Supercharged)
- ✔ 2017 Cadillac XTS (3.6L LF3)
- ✔ 2017 Chevrolet Corvette
Note: Please provide your VIN upon purchase to ensure we flash the module with the correct calibration for your specific vehicle and its options.
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the ECM with the exact software and calibrations specified by GM for your truck’s engine, transmission, and factory options. This ensures seamless integration and proper function, saving you a costly trip to the dealer for programming.
What is a ‘theft relearn’ and why do I need to do it?
The Vehicle Theft Deterrent System (VTDS) links your key, ignition, and ECM. When you install a new ECM, the system sees it as a potential theft and prevents the engine from starting. A relearn procedure, performed with a professional scan tool, syncs the new ECM with your vehicle’s security system, allowing it to start and run. This is a standard security feature on all modern GM vehicles.
Can I install this myself if I’m a DIYer?
Yes, the physical installation is straightforward for most DIYers with basic tools. However, you or your mechanic must have access to a professional-grade scan tool with GM software (like Techline Connect) to perform the mandatory security relearn and any other necessary setup procedures after installation.
Will this 2016-2018 Silverado 1500 ECM fix my check engine light?
If the check engine light is caused by an internal failure of the original ECM (e.g., codes P0601-P0606), then yes, this part is the correct fix. However, if the light is on due to a faulty sensor or another component, you must fix that underlying issue first. This module will not fix problems with other parts of the vehicle.
What other part numbers does this replace?
This module is a direct replacement for several part numbers, including 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. Ordering this part ensures you get a compatible unit for any of these original numbers.