Restore Peak Performance to Your GM Vehicle
Is your 2015-2016 Cadillac Escalade ESV, Chevy Silverado, or GMC Sierra running rough, stalling unexpectedly, or displaying a persistent check engine light? These are classic signs 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 12656993, is the definitive solution to restore your vehicle’s factory performance and reliability.
This isn’t just a generic part off the shelf. We provide a crucial service that sets our modules apart: we professionally program the unit to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the ECM has the latest GM software updates and is calibrated precisely for your vehicle’s engine, transmission, and factory options. This VIN-specific programming eliminates the need for an expensive trip to the dealership for flashing, saving you significant time and money and simplifying the installation process.
From the Diagnostic Bay
We had a 2015 Silverado 1500 come in with a complaint of intermittent stalling and a P0606 (Internal Control Module Processor Error) code. The owner had already replaced the throttle body and mass airflow sensor with no success. Before condemning the ECM, we performed a full power and ground check at the module’s connectors. We found a corroded ground wire on the engine block, barely making contact. After cleaning and securing the ground, the code cleared and the truck ran perfectly. While in this case the ECM was fine, it highlights a crucial step: always verify power and grounds to the ECM before replacement. A weak connection can mimic the symptoms of a failed module, and overlooking this simple check can lead to unnecessary expense.
The Critical Role of Your 2015-2016 Escalade ESV ECM
The Engine Control Module is the undisputed brain of your vehicle’s powertrain. It processes data from dozens of sensors throughout the engine and chassis—monitoring everything from crankshaft position and oxygen levels in the exhaust to throttle position and ambient air temperature. Using this data, it makes thousands of calculations per second to precisely control fuel injection timing, ignition spark, variable valve timing, and transmission shift points. When the ECM begins to fail, these critical calculations become erratic, leading to a wide range of performance problems.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light: Often the first indicator, with codes related to internal processor failure, sensor circuits, or communication errors.
- ✔ Engine Stalling or Misfiring: The engine may stall for no reason, either at idle or while driving. Misfires and rough idling are also common.
- ✔ No-Start Condition: A completely failed ECM can prevent the engine from starting at all by cutting power to the fuel pump or ignition coils.
- ✔ Poor Fuel Economy: Inefficient engine operation caused by incorrect fuel and air calculations will lead to a noticeable drop in MPG.
- ✔ Reduced Engine Power: The vehicle may feel sluggish, hesitate on acceleration, or enter a ‘limp mode’ with severely restricted power.
- ✔ Transmission Shifting Issues: The ECM works with the Transmission Control Module (TCM), and a fault can cause harsh shifting, delayed engagement, or incorrect gear selection.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for a wide range of popular GM trucks and SUVs. It is compatible with multiple original part numbers, ensuring a perfect fit and function. Please verify your vehicle’s fitment from the list below.
This module directly replaces the following part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318
Vehicle Fitment List:
- 2015-2016 Escalade & Escalade ESV
- 2014-2016 Silverado 1500 & Sierra 1500
- 2014-2015 Sierra Denali 1500
- 2015-2016 Tahoe, Suburban 1500, Yukon & Yukon XL 1500
- 2014-2016 Corvette
- 2016 Camaro (6.2L)
- 2014-2016 CTS (3.6L, 6.2L)
- 2014-2016 ATS (3.6L)
- 2014-2016 XTS (3.6L)
- 2015-2016 Colorado & Canyon (3.6L)
Note: While this part is programmed to your VIN, some vehicles may require a security relearn procedure (often called a CASE relearn or anti-theft relearn) after installation. This can typically be done by a qualified technician with a capable scan tool or, in some cases, with a simple key-cycling procedure.
Frequently Asked Questions
Do I need to get this ECM programmed?
No. We handle the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM-certified software for your specific vehicle. This makes the installation process much smoother.
Where is the ECM located on my vehicle?
On most trucks and SUVs like the Escalade, Silverado, and Sierra, the ECM is located in the engine compartment, typically on the driver’s side front fender area. On other vehicles like the Corvette, it may be located under the dash on the passenger side cowl. Always consult a repair manual for your specific model to confirm the location before beginning work.
Is this a difficult part to install?
The physical replacement is straightforward for someone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the module. The most critical part is ensuring the connectors are clean and seat properly. Some vehicles may require an additional security relearn procedure to sync the new ECM with the vehicle’s anti-theft system.
How do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this part fix my check engine light?
If the check engine light is on due to an internal failure of your original ECM (e.g., codes like P0601, P0606), then this replacement module will resolve the issue. However, if the light is on for another reason, such as a faulty sensor or wiring problem, you will still need to diagnose and repair that separate issue.