Restore Peak Performance to Your GM Vehicle
Is your Cadillac Escalade, Chevy Tahoe, or GMC Sierra running rough, stalling, or displaying a persistent Check Engine Light? These are common indicators of a failing Engine Control Module (ECM), the central computer that governs your vehicle’s engine performance, fuel economy, and emissions. A faulty ECM can lead to a cascade of frustrating and potentially damaging issues. This replacement Engine Control Module, part number 12674052, is the definitive solution to restore your vehicle’s factory-specified operation and reliability.
We take the guesswork and hassle out of the replacement process. Unlike sourcing a used module from a junkyard that requires expensive dealer programming, this ECM is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. We load the latest GM-certified software and calibrations, ensuring that when you receive the part, it is ready for installation and the final security handshake with your vehicle. This critical service saves you time, money, and the frustration of dealing with incompatible software.
From the Diagnostic Bay
We had a 2017 Yukon Denali come into the shop with a very erratic problem. The customer complained of intermittent stalling at stoplights and a transmission that seemed to shift harshly for no reason. There were no consistent trouble codes, just a few random communication errors that would come and go. After hours of chasing wires and testing sensors, we hooked up a scope to the main data lines of the ECM. We saw a noisy, unstable signal that pointed directly to an internal failure in the module. A replacement ECM, programmed to the vehicle’s VIN, solved all the ghost-like issues immediately. It’s a reminder that the ECM is the brain, and when it’s not healthy, the entire vehicle suffers in unpredictable ways.
Is Your GM Vehicle’s ECM Failing?
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a faulty ECM could be the culprit. Proper diagnosis is always recommended, but these are the classic signs:
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication, sensor circuits, or processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially under load.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG can be caused by the ECM failing to properly manage the air-fuel mixture.
- ✔ No-Start Condition: The engine cranks but refuses to start. This can happen if the ECM is not firing the fuel injectors or ignition coils.
- ✔ Erratic Transmission Shifting: The ECM works with the Transmission Control Module (TCM). A faulty ECM can send bad data, causing harsh or incorrect shifts.
- ✔ Communication Issues: Your diagnostic scan tool may be unable to communicate with the engine control module.
Installation and Procedures for your 2017 Escalade ESV ECM
While we handle the complex programming, there is a crucial final step you or your technician must perform upon installation. This is a standard procedure for modern GM vehicles to maintain their security.
Vehicle Theft Deterrent System (VTDS) Relearn: After installing the new ECM, the vehicle’s security system will not recognize it, and the engine will not start. This is normal. A VTDS relearn procedure must be performed to sync the new ECM with your vehicle’s ignition keys and Body Control Module (BCM). This procedure requires a professional scan tool with access to GM’s programming software, such as TIS2Web or the newer Techline Connect system. This is NOT a procedure that can be done by simply turning the key.
Other Potential Relearns: Depending on your vehicle’s specific configuration and the issues you were experiencing, other system relearns may be necessary. These can include:
- Crankshaft Position Variation Relearn: Calibrates the ECM to minor variations in the crankshaft reluctor wheel for accurate misfire detection.
- Injector Flow Rate Programming: Ensures the ECM knows the exact flow rate of the injectors for precise fuel delivery.
- Throttle Body Relearn: Resets the idle and full-range values for the electronic throttle body.
It is the end user’s responsibility to ensure these relearn procedures are completed by a qualified technician with the appropriate equipment. We supply a component correctly programmed to your VIN; the final vehicle integration must be completed on-site.
Broad Compatibility Across the GM Lineup
This Engine Control Module is a direct replacement for multiple part numbers, including 12692068, 12704476, 12686382, 12674052, 12674472, and 12678815. It fits a wide range of popular GM trucks, SUVs, and performance cars. Please verify your part number and check the detailed fitment list below to ensure compatibility.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will load the latest GM software specific to your vehicle.
What is a ‘theft relearn’ and why is it required?
The theft relearn is a security procedure that syncs the new ECM to your vehicle’s existing security components, like the BCM and keys. Without this step, the vehicle assumes it is being stolen and will disable the engine. It’s a necessary step for almost all modern ECM replacements.
Can I perform the theft relearn myself?
Unless you are a professional technician with access to GM’s official diagnostic and programming software (like Techline Connect), you will not be able to perform the theft relearn. It must be done with a compatible high-end scan tool.
Where is the ECM located on my 2017 Escalade?
On the 2017 Cadillac Escalade and Escalade ESV, as well as most of the listed GM trucks and SUVs (Tahoe, Yukon, Silverado, Sierra), the ECM is typically located in the engine compartment on the left-hand (driver’s) side. Always disconnect the battery before attempting removal or installation.
How do I provide my VIN?
You can add your VIN in the notes section during checkout or send it to us in a message after you complete your purchase. Please double-check the VIN for accuracy, as the programming is based entirely on this number.