Is your Sierra 3500’s transmission acting possessed? Unpredictable shifts, a stubborn refusal to go into gear, or a glaring check engine light can bring your workday to a screeching halt. These are classic signs that the brain of your transmission, the TCM, has failed. Don’t let a faulty module sideline your heavy-duty truck. This direct-replacement Transmission Control Module is the definitive solution, arriving at your door fully programmed with the latest GM software specifically for your vehicle’s VIN. This eliminates the need for expensive dealership programming, saving you both time and money.
Restore Peak Transmission Performance with a Reliable 2015-2016 Sierra 3500 TCM
Your GMC Sierra 3500 is built for tough jobs, and its transmission is a critical part of that capability. The TCM orchestrates every shift, ensuring smooth power delivery whether you’re hauling a heavy load or cruising on the highway. When it falters, you’ll feel it immediately. Our module restores that crisp, factory-new shifting logic. We handle all the complex programming in-house; simply provide your VIN during checkout, and we’ll flash the unit with the correct calibration files for your specific truck. This isn’t just a replacement part—it’s a complete, ready-to-install fix that gets you back to work with confidence.
A Mechanic’s Field Tale: The Downed Fleet Truck
I once had a landscaping company owner in a panic. His 2015 Sierra 3500, the backbone of his operation, was stuck in limp mode. It would shift hard from 1st to 2nd and then stay there. He was losing money every hour the truck was down. The dealer quoted him a week-long wait just for diagnostics. He found us, ordered a pre-programmed TCM, and we shipped it overnight. The next morning, he called me from the job site. He’d swapped the module in the parking lot in under 30 minutes. The truck was running perfectly, his crew was back to work, and he avoided a massive bill and a week of lost revenue. That’s the real-world value of a plug-and-play solution.
Key Symptoms of a Failing TCM
- ✔ Erratic or harsh shifting between gears
- ✔ Transmission getting stuck in one gear (limp mode)
- ✔ “Service Transmission” or “Service StabiliTrak” warnings on the dash
- ✔ Check Engine Light with diagnostic trouble codes (DTCs) like P0700, P0751, or U0101
- ✔ Complete loss of communication with the transmission module
- ✔ Delayed engagement when shifting into Drive or Reverse
Quick Installation Guide
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the TCM: On most 2015-2016 Sierra HD models, the TCM is mounted on the driver’s side of the fan shroud in the engine bay.
- Disconnect Connectors: Carefully release the locking tabs and unplug the large electrical connectors from the old module.
- Swap the Module: Unbolt the old TCM from its bracket and mount the new, pre-programmed module in its place.
- Reconnect Everything: Securely plug the electrical connectors into the new TCM until they click. Reconnect the battery terminal.
- Final Steps: Start the engine. The vehicle may need to go through a brief adaptive learning cycle. Drive the vehicle normally for 15-20 minutes to allow the transmission to adapt to the new module.
Compatibility Check: Does It Fit Your Vehicle?
This module is a direct fit for the following vehicles equipped with the 6-speed (MW7) or 8-speed (M5U) automatic transmission. It is compatible with part numbers 24272004 and 24276411.
- 2016 Cadillac CTS
- 2016 Chevrolet Camaro
- 2015-2017 Cadillac Escalade & ESV
- 2015-2016 GMC Sierra 1500 / Denali 1500
- 2015-2016 Chevrolet Silverado 1500
- 2015-2016 GMC Sierra 2500/3500 & Denali 2500/3500
- 2015-2016 Chevrolet Silverado 2500/3500
- 2015-2016 GMC Yukon & Yukon XL 1500
Note: After purchase, please reply to your order confirmation email with your vehicle’s 17-digit VIN to ensure precise programming.
Your Questions Answered about the 2015-2016 Sierra 3500 TCM
Do I need to do any programming myself?
Absolutely not. We handle all the programming before the module ships. It will arrive flashed with the latest GM software matched to your VIN, making it ready for installation right out of the box.
Why do you need my VIN?
The Vehicle Identification Number (VIN) allows us to access the exact factory calibration files for your truck’s specific configuration, including engine, transmission, and differential gearing. This ensures perfect communication and optimal performance.
Is this a difficult part to install for a DIYer?
For most individuals with basic mechanical skills, this is a straightforward installation. The module is typically easy to access in the engine bay, requiring only basic hand tools to swap. Following our guide should make the process manageable in under an hour.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause, this code can also be triggered by other transmission issues. It’s best to scan for more specific codes (like P07xx or U-codes) to confirm the TCM is the root cause.
What is the difference between part numbers 24272004 and 24276411?
These are often superseded part numbers from GM. Functionally, they are interchangeable for the listed applications. Our module is compatible with systems requiring either of these part numbers.