Restore Peak Performance to Your GM Truck or SUV
Is your 2017 Chevy Tahoe or other GM vehicle suffering from perplexing issues like random stalling, a persistent check engine light, or a complete no-start condition? As a technician with over two decades of experience, I’ve seen countless drivers frustrated by these exact symptoms, which often point directly to a failing Engine Control Module (ECM). The ECM is the brain of your engine, and when it falters, the entire vehicle’s performance and reliability are compromised. This isn’t just an inconvenience; it’s a critical failure that needs a dependable solution.
We offer a straightforward, reliable fix: a genuine GM Engine Control Module, part number 12674472, delivered to your door already programmed with the latest official GM software for your specific vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will handle the complex programming. This saves you a costly trip to the dealership and ensures the module you receive is ready for the final installation steps, getting you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in a 2017 Sierra 1500 with an intermittent no-crank, no-start issue that had stumped two other shops. The battery was new, the starter checked out, and there were no obvious wiring faults. The only clue was a U0100 (Lost Communication with ECM) code that would pop up sporadically. After checking network integrity, we focused on the ECM. On the surface, it seemed fine, but under load and heat soak conditions, the processor would drop communication. Swapping in this pre-programmed ECM and performing the security relearn solved the problem instantly. It’s a classic example of how a failing module can cause ghost-in-the-machine problems that are difficult to pin down without experience.
Is Your Vehicle Showing These Symptoms?
A faulty ECM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Check Engine Light is on with communication codes (e.g., U0100) or internal processor codes (e.g., P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially after the engine warms up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Issues with automatic transmission shifting, as the ECM communicates with the TCM.
A Straightforward Guide to Your ECM Installation
Replacing the ECM is a manageable job for an experienced DIYer or any professional technician. Following these steps ensures a smooth process. Please note the critical final step requiring a GM diagnostic tool.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- Locate the ECM: On most trucks and SUVs like the Tahoe and Silverado, the ECM is found in the engine compartment on the driver’s side, often near the firewall or inner fender.
- Disconnect and Remove: Carefully unplug the wiring harness 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 wiring harnesses, ensuring they click securely into position.
- Reconnect Battery: Reattach the negative battery terminal.
- CRITICAL – Perform Relearn Procedures: The vehicle will NOT start until a Vehicle Theft Deterrent System relearn is completed. This procedure pairs the new ECM to your vehicle’s security system. This requires a professional scan tool with access to GM’s TIS2Web or Techline Connect software. Additional procedures like a Crankshaft Variation Relearn may also be necessary. This is the responsibility of the installer.
Will This Fit My Vehicle?
This Engine Control Module is a direct replacement for part number 12674472 and other interchangeable numbers. It is guaranteed to fit the following vehicles:
- Cadillac ATS: 2017 (3.6L, VIN Y)
- Cadillac CTS: 2017 (6.2L Supercharged or 3.6L Twin Turbo VIN 8)
- Cadillac Escalade / ESV: 2017
- Cadillac XTS: 2017 (3.6L, VIN 8)
- 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
Note: This module also replaces part numbers 12692068, 12704476, 12686382, 12674052, and 12678815.
What do I need to do after I place my order?
What do I need to do after I place my order?
After your purchase is complete, you must send us your vehicle’s 17-digit VIN. We cannot program and ship your module without it. This ensures the ECM has the correct software and calibrations for your specific vehicle configuration.
Will my truck start immediately after installation?
No. Because the ECM is a core part of the security system, the vehicle will be immobilized until a Vehicle Theft Deterrent relearn is performed. This is a mandatory step.
What tools do I need for the final relearn procedures?
You or your mechanic will need a professional-grade diagnostic tool that can access the official GM programming system, such as TIS2Web or Techline Connect. Standard OBD-II code readers cannot perform these functions.
Is this a guaranteed fix for my check engine light?
This module will resolve any issues and diagnostic trouble codes (DTCs) directly caused by a failing ECM. However, if your check engine light is on due to other failing components (like sensors or wiring), those issues will still need to be addressed separately.
Why is getting a pre-programmed module better?
Receiving a module that is already flashed with the latest GM software for your VIN saves significant time and money compared to buying a blank module and having a dealership program it from scratch. It streamlines the repair process, leaving only the final on-vehicle relearn procedures.