Restore Peak Performance to Your GM Truck or SUV
Is your 2015-2016 Chevrolet Tahoe running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s performance, fuel economy, and emissions. A faulty ECM can be a frustrating problem, but the solution is straightforward. This direct-replacement ECM, part number 12662034, is the reliable fix you need to get your vehicle back on the road and running smoothly.
As a technician with over 20 years of experience, I’ve seen firsthand how a failing ECM can mimic other issues, leading to costly and incorrect repairs. This module isn’t just a part; it’s a complete solution. We professionally program it with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This critical step ensures perfect communication between all of your vehicle’s systems, restoring the precise performance and efficiency you expect from your GM vehicle.
From the Diagnostic Bay: The Intermittent Stall Case
A customer brought in a 2015 Yukon XL with an intermittent stalling problem that was driving them crazy. It would die at stoplights, but then start right back up. Another shop had already replaced the fuel pump to no avail. After hooking up my scan tool and monitoring live data, I noticed the 5-volt reference signal to several key sensors would drop out just before the stall. This is a tell-tale sign of an internal ECM failure. We installed one of these pre-programmed modules, performed the security relearn, and the problem was solved permanently. It saved the customer from another expensive misdiagnosis.
Common Signs of a Failing Engine Computer
If you’re experiencing any of the following, a faulty ECM is a likely culprit. Replacing your 2015-2016 Tahoe ECM can be the definitive solution.
- ✔ Check Engine Light is on (with codes like P0601, P0606, or U0100)
- ✔ Engine stalling or misfiring
- ✔ Rough or inconsistent idling
- ✔ Vehicle won’t start at all
- ✔ Noticeable decrease in fuel economy
- ✔ Poor acceleration or loss of power
- ✔ Transmission shifting issues
A Straightforward Guide to Installation
Installing your new ECM is a manageable job for a confident DIYer. Just follow these general steps. Note: A security relearn procedure may be required after installation, which can often be done without special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the ECM: On most GM trucks and SUVs like the Tahoe and Silverado, the ECM is located in the front of the engine compartment on the driver’s side, near the airbox.
- Disconnect Connectors: Carefully release the locking tabs and unplug the large electrical wiring harnesses from the old module. Avoid forcing them.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket and remove it from the vehicle.
- Install the New ECM: Mount your new, pre-programmed module in place and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click securely in place. Reconnect the negative battery terminal.
- Perform Security Relearn: Start the vehicle. If it starts and then immediately stalls, you will need to perform the vehicle’s 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.
Will This Fit My Vehicle?
This ECM is a direct replacement for a wide range of GM vehicles and is compatible with multiple part numbers, including 12692067, 12676230, 12656993, 12662034, 12672537, 12673195, and more. While this is a perfect fit for the 2015-2016 Tahoe ECM, please verify your vehicle in the list below:
CAMARO 16 (6.2L)
CANYON 15-16 (3.6L)
COLORADO 15-16 (3.6L)
CORVETTE 14-16
CTS 14-16 (3.6L, 6.2L)
ESCALADE & ESV 15-16
SIERRA 1500 PICKUP 14-16
SIERRA DENALI 1500 14-16
SILVERADO 1500 PICKUP 14-16
SUBURBAN 15-16
TAHOE 15-16
YUKON & YUKON XL 15-16
XTS 14-16 (3.6L, LF3)
Note: Please check the specific ID on your original module if listed for your model.
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 factory software for your vehicle’s specific engine, transmission, and options. This ensures 100% compatibility and proper function without a trip to the dealer.
Is this a plug-and-play part?
Yes, for the most part. Because we program it to your VIN, it eliminates the most difficult step. However, on many GM vehicles, you will need to perform a simple security/anti-theft relearn procedure after installation, which typically takes about 30 minutes and requires no special tools.
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 will resolve the issue. It’s always best to have the codes read first to confirm the diagnosis.
What if my original part number isn’t 12662034?
This module is a hardware equivalent for many different GM part numbers. As long as your vehicle model and year are on our compatibility list and your original part number is one of the listed compatible numbers (like 12692067, 12676230, etc.), this module will work perfectly.
Do I need to send my old ECM (core) back?
No core charge or return is required for this particular module. You can purchase it outright.