Restore Peak Performance to Your Cadillac or GM Vehicle
Is your vehicle suffering from frustrating issues like a persistent Check Engine Light, sudden stalling, poor fuel economy, or a no-start condition? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as the brain of your engine. When it falters, the entire vehicle’s performance suffers. This isn’t just an annoyance; it’s a critical component failure that can leave you stranded. This replacement ECM is the reliable, straightforward solution to get your vehicle running smoothly and efficiently again.
We take the guesswork and dealer expense out of the equation. Each 2014-2016 CTS ECM is meticulously programmed with the latest official GM software updates specific to your vehicle’s VIN. This means it arrives at your door ready for installation, saving you a costly trip to the dealership for programming services. You’re not just getting a part; you’re getting a complete, plug-and-play solution designed to restore factory function and clear those stubborn diagnostic trouble codes for good.
Case Study: A Tricky Diagnosis
I once had a 2015 Cadillac CTS in the bay with an intermittent no-start and random stalling that no one could figure out. The owner had already replaced the battery and fuel pump. Scans showed a loss of communication code (U0100) that would come and go. After checking the wiring harness for chafing—a common issue on these platforms—I focused on the ECM itself. By monitoring power and ground signals to the module during a wiggle test, I found the internal power control circuit was failing intermittently, especially when hot. Replacing the ECM with a properly programmed unit like this one solved the problem permanently. It’s a reminder that not all electronic issues are in the wiring; the module itself can be the root cause.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0606, or P062B
- ✔ Intermittent or complete no-start condition
- ✔ Engine stalling or stumbling unexpectedly
- ✔ Noticeable decrease in fuel mileage
- ✔ Erratic automatic transmission shifting
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge completely.
- ✔ Locate the ECM: On most compatible vehicles like the CTS, Silverado, or Sierra, the ECM is found in the engine compartment, often on the driver’s side near the firewall or fuse box.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical harness connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are typically a few 10mm bolts holding it in place.
- ✔ Install the New ECM: Mount your new, pre-programmed ECM securely onto the bracket and tighten the bolts.
- ✔ Reconnect Everything: Plug the electrical connectors back into the new module until they click firmly into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: Many GM vehicles require a security relearn procedure to sync the new ECM with the vehicle’s anti-theft system. This can often be done without special tools by cycling the key. A common method is to turn the key to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times. Consult your vehicle’s service information for the exact procedure.
Verified Vehicle Compatibility
This module, part number 12663391, is a direct replacement for a wide range of GM vehicles and supersedes multiple part numbers, including 12692067, 12676230, and 12656993. Please ensure your vehicle is on the list below. Providing your VIN at checkout is required so we can ensure perfect programming for your specific make, model, and options.
CAMARO 16 (6.2L)
CANYON 15-16 (3.6L)
COLORADO 15-16 (3.6L)
CORVETTE 14-16
CTS 14-15 (Sdn, 3.6L)
CTS 16 (3.6L, opt LF3 or 6.2L)
ESCALADE & ESV 15-16
SIERRA 1500 PICKUP 14-16
SIERRA DENALI 1500 14-16
SILVERADO 1500 PICKUP 14-16
SUBURBAN 1500 15-16
TAHOE 15-16
YUKON & YUKON XL 1500 15-16
XTS 14-16 (3.6L, opt LF3)
Frequently Asked Questions
Do I need to do anything after installing this ECM?
Because we program the module to your VIN, it is ready for installation. However, you will likely need to perform a simple ‘Security Relearn’ or ‘Anti-Theft Relearn’ procedure, which typically involves a few key cycles and does not require a scan tool.
Is this a new or used part?
This is a high-quality, inspected, and tested OEM component guaranteed to function to factory specifications. It comes programmed with the latest GM software for your vehicle.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information.
Will this fix my specific problem?
This ECM will correct issues directly caused by a faulty engine computer, such as internal processor faults (P0606) or communication errors. While it solves many common problems, always ensure a proper diagnosis has been performed, as other components like wiring or sensors can cause similar symptoms.
What if I have the wrong part number?
This module is compatible with multiple part numbers, including 12692067, 12676230, 12656993, and more. As long as your vehicle is on the compatibility list, this part will work when programmed to your VIN.