Restore Peak Performance to Your Cadillac Escalade ESV
Is your 2015-2016 Cadillac Escalade ESV suffering from puzzling performance issues, a persistent check engine light, or a no-start condition? The Engine Control Module (ECM), the master computer of your vehicle’s powertrain, is often the source of these frustrating problems. This genuine GM Engine Control Module, part number 12663391, is the definitive solution to restore your luxury SUV’s engine health, drivability, and reliability. We take the guesswork out of the repair by programming the module specifically to your vehicle’s VIN before it ships, ensuring a seamless, plug-and-play installation.
The Brain of Your Engine: Why a Healthy ECM Matters
The ECM is responsible for managing a complex network of sensors and actuators that control everything from fuel injection and ignition timing to transmission shifting and emissions systems. When it begins to fail, the symptoms can be widespread and difficult to diagnose. Internal component failure, often caused by heat, vibration, or voltage irregularities, can lead to incorrect calculations and commands, throwing your entire powertrain out of sync. Replacing a faulty module with a correctly programmed unit is critical for restoring the precise factory-specified operations that your Escalade’s advanced engine demands.
From the Diagnostic Bay
We had a 2015 Escalade towed in that had every mechanic who looked at it stumped. The vehicle would start and run fine for about 10 minutes, then suddenly stall and refuse to restart for an hour. There were no consistent trouble codes, just a slew of intermittent communication errors. After exhausting all other possibilities—checking wiring harnesses, grounds, and fuel pressure—we focused on the ECM. By monitoring live data, we noticed the processor temperature reading would spike just before the stall. The ECM was internally shorting out as it warmed up. Swapping in a VIN-programmed module like this one had the Escalade running perfectly within minutes. It’s a classic example of how a failing ECM can create symptoms that mimic a dozen other problems.
Signs Your 2015-2016 Escalade ESV Engine Control Module is Failing
A failing ECM can manifest in various ways. If you’re experiencing any of the following, your engine’s computer may be the culprit. This module is the direct solution for these common issues.
- ✔ Check Engine Light: The most common indicator, often with codes related to module communication (U-codes) or processor faults (P06xx codes).
- ✔ No-Start or Hard Starting: The engine cranks but won’t start, or takes an unusually long time to fire up, due to incorrect fuel or spark commands.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling can all point to a faulty ECM.
- ✔ Reduced Fuel Economy: If the ECM isn’t managing the air-fuel mixture correctly, your gas mileage can drop significantly.
- ✔ Erratic Transmission Shifting: The ECM works with the TCM to control shift points. A failing module can cause harsh or delayed shifts.
- ✔ Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
Plug-and-Play Solution with VIN Programming
The biggest hurdle in replacing a modern ECM is programming. This module eliminates that problem. Simply provide us with your vehicle’s 17-digit VIN during checkout. Our technicians will use official GM equipment to flash the module with the latest, most stable software specific to your Escalade ESV’s configuration. This ensures that the module communicates flawlessly with all other systems in your vehicle right out of the box. No expensive trip to the dealership for programming is required. In most cases, a simple security relearn procedure may be necessary after installation, which can be done without special tools.
Guaranteed Compatibility
This Engine Control Module is a direct replacement for a wide range of GM trucks and SUVs. It is compatible with multiple original part numbers, including: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318. It fits the following vehicles:
- 2015-2016 Cadillac Escalade & Escalade ESV
- 2014-2016 Chevrolet Silverado 1500
- 2014-2016 GMC Sierra 1500 & Sierra Denali 1500
- 2015-2016 Chevrolet Suburban 1500 & Tahoe
- 2015-2016 GMC Yukon & Yukon XL 1500
- 2014-2016 Cadillac CTS (3.6L, 6.2L)
- 2014-2016 Cadillac ATS (3.6L)
- 2014-2016 Cadillac XTS (3.6L)
- 2014-2016 Chevrolet Corvette
- 2016 Chevrolet Camaro (6.2L)
- 2015-2016 Chevrolet Colorado (3.6L)
- 2015-2016 GMC Canyon (3.6L)
Please verify the part number and vehicle fitment to ensure proper function. If you are unsure, contact us with your VIN, and we will confirm compatibility for you.
Frequently Asked Questions
Do I need to do any programming after I receive this module?
No. We program the module to your specific VIN before shipping. It arrives ready to be installed. In some cases, a security or anti-theft relearn procedure may be necessary, which typically involves a sequence of key cycles and can be done by you without any special tools.
Where is the ECM located on my 2015-2016 Escalade ESV?
On the 2015-2016 Escalade ESV, as well as most GM trucks and SUVs from this era, the Engine Control Module is located in the engine compartment on the left-hand (driver’s) side, often near the firewall or inner fender.
How do I provide my VIN number?
You can add your 17-digit Vehicle Identification Number (VIN) in the notes section during checkout. If you forget, we will contact you via email to request it before we can program and ship your part.
Is this a genuine GM part?
Yes, this is a genuine GM electronic control module, ensuring perfect fitment, function, and communication with your vehicle’s other onboard systems. We load it with the latest GM-certified software for your vehicle.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to have your vehicle properly diagnosed to confirm the ECM is the point of failure, as other sensor or wiring issues can sometimes cause similar symptoms.