Restore Peak Performance to Your GM Truck or SUV
Is your Sierra, Silverado, or other GM vehicle acting up? Experiencing frustrating issues like a persistent check engine light, sudden stalling, rough idling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer of your vehicle. When the ECM falters, it can throw your engine’s entire operation into chaos, affecting everything from fuel delivery to transmission shifting. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s reliability and safety.
As a technician with over two decades of experience, I’ve seen countless vehicles sidelined by faulty electronics. A bad ECM can be tricky to diagnose, often mimicking other sensor failures. But once identified, the solution is clear. This replacement Engine Control Module, part number 12674472, is the definitive fix. We take the guesswork and hassle out of the replacement process by pre-programming the module to your vehicle’s specific VIN with the latest GM factory software. This ensures perfect communication between the new ECM and all other systems in your truck, just as the manufacturer intended.
From the Diagnostic Bay
I remember a 2017 Sierra Denali that came into the shop on a tow truck. The owner was frustrated; it would crank but not start, and two other shops had already replaced the fuel pump and crankshaft position sensor without success. The dashboard was lit up with communication error codes (U0100) and an internal processor fault (P0606). My scan tool couldn’t reliably communicate with the ECM. This intermittent communication is a dead giveaway. We confirmed power and ground to the module were good, pointing directly to an internal failure. By installing a VIN-programmed Sierra Denali 1500 ECM, we had it running perfectly after performing the security relearn. The customer was back on the road in an afternoon, saving hundreds over a dealership repair.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100
- ✔ Engine cranks but refuses to start
- ✔ Intermittent stalling or shutting off while driving
- ✔ Noticeable drop in fuel economy
- ✔ Poor engine performance, hesitation, or misfires
- ✔ Automatic transmission shifting erratically
- ✔ Other warning lights (e.g., traction control) appearing for no reason
Your Straightforward Installation Roadmap
Installing your new Sierra Denali 1500 ECM is a manageable job for a confident DIYer or a quick task for any professional technician. We handle the complex programming; you handle the physical swap.
- Provide Your VIN: After your purchase, you must send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have programmed it.
- 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 Sierra and Silverado, the ECM is located in the engine compartment, typically on the driver’s side near the fender or firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New ECM: Mount the new, pre-programmed module in place and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click firmly into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedures: Attempt to start the vehicle. If it does not start, a Vehicle Theft Deterrent System (VTDS) relearn is required. This must be done using a professional tool with access to GM’s TIS2Web or Techline Connect service. Other procedures like a crankshaft position variation relearn may also be necessary to ensure optimal performance. This is the responsibility of the installer.
Verified to Fit These GM Vehicles
This ECM is a direct replacement for part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It is confirmed to fit the following models. Please verify your part number or contact us with your VIN to ensure compatibility.
- Cadillac ATS (2017): 3.6L (VIN Y, LF4)
- Cadillac CTS (2017): 3.6L (VIN 8, LF3 Twin Turbo), 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 (2016-2018)
- GMC Sierra Denali 1500 (2017-2018)
- GMC Yukon / Yukon XL (2017)
Frequently Asked Questions
Sierra Denali 1500 ECM
What if my vehicle has different issues after installation?
If new or different symptoms appear, it often indicates that an additional procedure, like a crankshaft variation relearn or injector flow rate programming, is required. These are standard procedures after replacing a and are part of the normal installation process.