Restore Peak Performance to Your GM Truck or SUV
Is your 2015-2016 GMC Yukon XL 1500 running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the computer that manages your vehicle’s engine performance, fuel economy, and emissions. A faulty ECM can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it affects your vehicle’s reliability and safety. This replacement ECM, part number 12669318, is the definitive solution to restore your vehicle’s factory performance and dependability.
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 programmed with the latest official GM software, specifically matched to your vehicle’s VIN. This means no expensive trip to the dealership for programming. It’s a direct-fit, ready-to-install solution designed for both professional technicians and capable DIYers who want to get the job done right the first time. By providing your VIN at checkout, you ensure this 2015-2016 Yukon XL 1500 ECM will communicate flawlessly with your vehicle’s existing systems.
Common Symptoms of a Failing ECM
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601, P0606, or other communication errors (U-codes).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Other warning lights on the dash, such as for the traction control system.
Case Study: A Tricky Diagnosis
I had a 2015 Sierra 1500 in the shop last month with a bizarre issue. The owner complained of random stalling at stoplights and a transmission that felt like it was shifting with a sledgehammer. He’d already replaced a few sensors with no luck. The scanner showed a communication fault code (U0100) that would come and go. Instead of just throwing more parts at it, we checked the power and ground circuits to the ECM—they were perfect. That’s the key. When the wiring is good but communication is bad, the module itself is often the culprit. We installed a VIN-programmed 2015-2016 Yukon XL 1500 ECM (the same family of module) and performed the security relearn. The truck ran perfectly, shifting smoothly and the codes never returned. It saved the customer hundreds over what a dealership would have charged for the same diagnosis and repair.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
- ✔ Locate the ECM: On most GM trucks and SUVs like the Yukon XL, the ECM is located in the engine compartment, typically on the driver’s side near the firewall or inner fender.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will reuse it.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- ✔ Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will need to perform a security relearn procedure (often called a ‘key-on/key-off’ cycle) to sync the new ECM with your vehicle’s anti-theft system. This procedure is simple and instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12669318 and is interchangeable with several other GM part numbers, including 12692067, 12676230, 12656993, and more. It fits a wide range of GM vehicles. Please verify your vehicle is on this list before ordering:
SIERRA 1500 PICKUP 14-16
SIERRA DENALI 1500 14-16
TAHOE 15-16
SUBURBAN 1500 15-16
YUKON 15-16
YUKON XL 1500 15-16
ESCALADE & ESCALADE ESV 15-16
CAMARO 16 (6.2L)
CORVETTE 14-16
CTS 14-16 (3.6L, 6.2L)
ATS 14-16 (3.6L)
XTS 14-16 (3.6L)
COLORADO 15-16 (3.6L)
CANYON 15-16 (3.6L)
Note: For some models, fitment depends on the ID number printed on your original module. Please match part numbers for guaranteed compatibility.
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and the module will arrive with the latest GM software specific to your vehicle.
Is this a difficult part to install for a DIYer?
The physical replacement is straightforward for anyone comfortable working on their vehicle. It involves basic hand tools. The only additional step is a simple security relearn procedure, which does not require special scan tools.
What is the security relearn procedure?
It’s a process that allows your vehicle’s anti-theft system to recognize the new ECM. Typically, it involves a sequence of turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for a few seconds, repeated three times. Your vehicle will not start until this is completed.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606), then yes, this part will resolve the issue. However, you should always ensure your vehicle has been properly diagnosed, as other faulty sensors or wiring can also cause a check engine light.
How do I find my original part number?
The part number is printed on a sticker on the case of your current ECM. You may need to unbolt it to see the label clearly. Matching the part number is the best way to ensure compatibility.