Is Your GM Truck or SUV Suffering from Mysterious Engine Problems?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition, a failing Engine Control Module (ECM) is often the culprit. As a technician with over 20 years of experience, I’ve seen how a faulty ECM can throw confusing diagnostic codes and make your vehicle unreliable. This isn’t just an inconvenience; it’s a critical failure that compromises performance and safety. This replacement Engine Control Module, part number 12674472, is the definitive solution to restore your vehicle’s factory operation.
The Smart Solution: Pre-Programmed for Your Vehicle
Forget the hassle and expense of a dealership visit for programming. We take care of the most critical step for you. Before this module ships, our experts will flash it with the latest official GM software calibrations, precisely matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between the new ECM and all other systems in your truck or SUV.
- ✔ VIN-Specific Programming: We load the correct software for your exact vehicle build, ensuring optimal performance.
- ✔ Latest GM Updates: Your new module will have the most current calibrations available, addressing potential factory bugs and improving efficiency.
- ✔ Direct-Fit Replacement: Guaranteed to interchange with part numbers 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815.
- ✔ Restores Core Functionality: Fixes common symptoms like false sensor codes, poor fuel economy, and intermittent stalling.
Expert Pro Tip: Check Your Grounds First!
Before condemning your ECM, I always tell my customers to perform one simple check. Locate the main engine-to-chassis ground strap. On many of these GM trucks, it’s a braided strap near the passenger side motor mount. Over time, it can corrode, causing high resistance. This poor ground can create bizarre electrical issues—like flickering lights and random communication codes—that perfectly mimic a failing ECM. A five-minute inspection with a wire brush can sometimes save you hundreds of dollars. If the ground is clean and tight, and the problems persist, the ECM is your next logical step.
Important Post-Installation Steps: A Heads-Up for a Smooth Repair
While we handle the main programming, modern GM vehicles have sophisticated security systems. Upon installing this 2017 Tahoe Engine Module, you or your mechanic will need to perform a few final setup procedures. This is a standard part of the repair process for these vehicles.
Please Note: The buyer is responsible for completing these final steps. Access to a professional scan tool or GM’s TIS2WEB/Techline Connect software is required.
- Vehicle Theft Deterrent System (VTDS) Relearn: If the vehicle cranks but does not start after installation, the security system must be relearned to the new ECM. This is the most common procedure you’ll need to perform.
- Crankshaft Position Variation Relearn (CASE Relearn): This procedure calibrates the ECM to minor variations in the crankshaft reluctor wheel to prevent misfire codes.
- Other Relearns: Depending on your vehicle’s specific options, other minor setups, like for fuel injectors, may be necessary.
Simple Installation Guide
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: On most Tahoes, Yukons, and Silverados, the ECM is located in the left-hand (driver’s side) front of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harnesses from the old module. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt the new ECM into place and securely reconnect the wiring harnesses. You should hear a click as they lock.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearns: Proceed with the necessary relearn procedures as outlined above.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for the following vehicles, but always verify your part number for a perfect match:
- Cadillac Escalade / ESV (2017): Electronic Control Module; (engine compartment)
- Cadillac XTS (2017): Electronic Control Module; (3.6L), VIN 8 (8th digit, opt LF3)
- Cadillac CTS (2017): Electronic Control Module; 6.2L (supercharged) or 3.6L, VIN 8 (twin turbo)
- Cadillac ATS (2017): Electronic Control Module; (LH engine compartment), 3.6L, VIN Y (8th digit, opt LF4)
- Chevrolet Corvette (2017): Electronic Control Module; (RH cowl under dash)
- Chevrolet Tahoe (2017): Electronic Control Module; (LH front engine compartment)
- Chevrolet Suburban 1500 (2017): Electronic Control Module; (LH front engine compartment)
- Chevrolet Silverado 1500 (2016-2017): Electronic Control Module; (LH front engine compartment)
- Chevrolet Silverado 1500 (2018): Electronic Control Module; (LH front engine compartment), ID 12686382
- GMC Yukon / Yukon XL 1500 (2017): Electronic Control Module; (LH front engine compartment)
- GMC Sierra 1500 / Denali 1500 (2016-2017): Electronic Control Module; (LH front engine compartment)
- GMC Sierra 1500 / Denali 1500 (2018): Electronic Control Module; (LH front engine compartment), ID 12686382