Restore Your Vehicle’s Brainpower and Performance
Is your Cadillac, Chevy, or GMC truck suffering from frustrating and intermittent issues? A check engine light that won’t go away, rough idling, stalling, or a sudden drop in fuel economy are all classic signs of a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the entire system can become unreliable. This pre-programmed Engine Control Module, part number 12663391, is the direct, reliable solution to get your vehicle running like new again.
From the Diagnostic Bay
We had a 2015 Silverado 1500 come into the shop with a persistent P0606 (ECM/PCM Processor Fault) code. The owner had already replaced the throttle body and multiple sensors chasing the problem, with no success. The truck would run fine for a few days, then suddenly go into reduced power mode. After verifying the wiring and power/ground circuits to the module were solid, we identified the internal processor of the original ECM as the culprit. We installed one of these VIN-programmed modules, performed the quick security relearn, and the truck was back on the road permanently fixed. It’s a reminder that sometimes the most complex symptoms point back to the central computer.
Is Your GM Vehicle Showing Signs of a Faulty ECM?
- ✔ Persistent Check Engine Light (CEL) with communication or processor-related codes.
- ✔ Engine stalling, stumbling, or hesitating for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic idling.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Transmission shifting problems or harsh shifts.
- ✔ Failure to pass state emissions testing.
The Plug-and-Play Solution: A Pre-Programmed 2014-2016 CTS Engine Module
One of the biggest hurdles in replacing a modern ECM is the need for expensive and complicated programming at a dealership. We eliminate that step entirely. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest, most stable GM-certified software specific to your exact vehicle build. This ensures that the module communicates perfectly with your car’s other systems right out of the box. It arrives at your door ready for installation, saving you time, money, and the hassle of a dealership appointment.
This module is a direct replacement for a wide range of popular GM vehicles, not just the Cadillac CTS. It’s the correct component for many trucks and SUVs that share this powerful engine management platform. Proper functionality is guaranteed when you provide a valid VIN for programming.
Wide-Ranging GM Compatibility
This ECM is compatible with an extensive list of General Motors vehicles. If your original part number matches any of the following, this module is the correct replacement for you:
Compatible Part Numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, 12669318.
Popular Vehicle Fitments Include:
- 2014-2016 Cadillac CTS (3.6L, 6.2L)
- 2014-2016 Chevrolet Silverado 1500
- 2014-2016 GMC Sierra 1500 / Sierra Denali 1500
- 2014-2016 Chevrolet Corvette
- 2015-2016 Cadillac Escalade / ESV
- 2015-2016 Chevrolet Tahoe & Suburban 1500
- 2015-2016 GMC Yukon / Yukon XL 1500
- 2014-2016 Cadillac ATS (3.6L)
- 2016 Chevrolet Camaro (6.2L)
- 2015-2016 Chevrolet Colorado / GMC Canyon (3.6L)
- 2014-2016 Cadillac XTS (3.6L)
Please verify your vehicle’s specific options and original part number to ensure a perfect match.
Frequently Asked Questions
Why do you need my VIN number?
Your Vehicle Identification Number (VIN) is essential because it contains specific information about your car’s engine, transmission, emissions system, and factory-installed options. We use the VIN to load the exact GM software and calibrations your vehicle needs to run correctly. This VIN-matching process ensures a seamless, plug-and-play installation without needing a trip to the dealer.
Is this module difficult to install?
For someone with basic mechanical skills, installation is straightforward. The ECM is typically located in the engine bay (e.g., LH front on a Silverado) or under the cowl. The process involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then reversing the process with the new one. Always disconnect the battery’s negative terminal before beginning work.
Will I need to do anything after I install the new ECM?
In most GM vehicles of this era, you will need to perform a simple security relearn procedure, also known as the Pass-Key or anti-theft relearn. This procedure syncs the new ECM to your vehicle’s security system and keys. It typically involves a sequence of turning the key to the ‘ON’ position for 10-15 minutes, three times in a row. Instructions are widely available online and are easy to follow.
How can I be sure this is the correct part for my vehicle?
The best way to confirm compatibility is to match the part number from your original, existing ECM to one of the numbers listed in this description (e.g., 12663391, 12672537, etc.). You can also use the detailed fitment list provided, but checking the physical part number on your old unit is the most accurate method.
What is the difference between an ECM, ECU, and PCM?
The terms are often used interchangeably. ECM stands for Engine Control Module. ECU stands for Electronic Control Unit, a more generic term. PCM, or Powertrain Control Module, typically refers to a unit that controls both the engine and the automatic transmission. For this application, the part functions as the primary engine computer and these terms all refer to the same component.