Restore Peak Performance to Your GM Vehicle
Is your Cadillac, Silverado, or Corvette suffering from baffling issues like intermittent stalling, a persistent Check Engine Light, or poor fuel economy? As a technician with over two decades of experience, I’ve seen firsthand how a failing Engine Control Module (ECM) can be the hidden culprit behind a host of frustrating problems. It’s the brain of your engine, and when it falters, the symptoms can mimic a dozen other component failures, leading to expensive and incorrect repairs. This Engine Control Module, part number 12669318, is the definitive solution to restore your vehicle’s reliability and performance.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store, this unit arrives at your door fully programmed with the latest GM-certified software, specifically matched to your vehicle’s VIN. This means no expensive trips to the dealership for programming. It’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence. By providing us with your VIN at checkout, you ensure that this 2014-2016 CTS Engine Control Module will communicate flawlessly with your vehicle’s other systems right out of the box.
Case Study: A Tricky Diagnosis
I once had a 2015 Cadillac CTS in my bay with a complaint that stumped two other shops. The car would randomly refuse to start, but only on warm days. It threw a mix of communication codes (U0100) and random sensor faults. We checked wiring, grounds, and even replaced the battery. Nothing worked. Finally, we monitored the ECM’s internal temperature data and saw it spiking right before a no-start event. The processor was failing under heat soak. We installed a VIN-programmed module just like this one, and the car has run perfectly ever since. This isn’t just a part; it’s a permanent fix for complex electronic issues.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Your vehicle experiences unexplained stalling or hesitation while driving.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Engine cranks but refuses to start.
- ✔ Communication errors with scan tools or other modules (U-codes).
- ✔ Harsh or erratic automatic transmission shifting.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the ECM: On most compatible vehicles like the Silverado or CTS, the ECM is found in the engine compartment, often on the driver’s side fender or firewall. It’s a metal box with several large electrical connectors.
- ✔ Disconnect and Remove: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn: You will need to perform a simple anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new ECM to sync with your vehicle’s security system.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM cars and trucks. While this is the correct 2014-2016 CTS Engine Control Module, it also fits many other models. Please verify your vehicle is on this list. It is compatible with part numbers: 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, 12663391, 12672963, and 12669318.
- ✔ ATS (2014-2016)
- ✔ CAMARO (2016)
- ✔ CANYON (2015-2016)
- ✔ COLORADO (2015-2016)
- ✔ CORVETTE (2014-2016)
- ✔ CTS (2014-2016)
- ✔ ESCALADE / ESV (2015-2016)
- ✔ SIERRA 1500 / DENALI (2014-2016)
- ✔ SILVERADO 1500 (2014-2016)
- ✔ SUBURBAN 1500 (2015-2016)
- ✔ TAHOE (2015-2016)
- ✔ XTS (2014-2016)
- ✔ YUKON / XL 1500 (2015-2016)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. We use it to load the exact, correct GM software for your vehicle’s specific options, engine, and transmission. This ensures perfect compatibility and function without requiring a trip to the dealer.
Is this a plug-and-play part?
Yes, for the most part. Because we pre-program it, you will not need a dealership scan tool. However, you will need to perform a simple ‘Anti-Theft Relearn’ or ‘Security Relearn’ procedure, which takes about 30 minutes and only requires the vehicle’s key. Instructions are included.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the old ECM (e.g., codes P0601, P0606), then yes, this module is the correct fix. It’s crucial to properly diagnose the issue first, as the light can be triggered by many other failing sensors or components.
Is this module compatible with other part numbers?
Yes. This ECM, part number 12669318, directly supersedes and replaces a long list of previous GM part numbers, including 12692067, 12676230, 12656993, and more. If your old module has any of the part numbers listed in our description, this unit will work perfectly.
What if I have a different problem, like a transmission issue?
The ECM is the central computer and heavily influences transmission behavior, such as shift points and line pressure. A faulty ECM can often be misdiagnosed as a transmission problem. Replacing a known-bad ECM can resolve these types of symptoms.