Get Your Heavy-Duty Truck Back in Command
The Transmission Control Module (TCM) is the nerve center of your 2015-2016 GMC Sierra 3500’s automatic transmission. When it begins to fail, it can turn your dependable workhorse into a source of frustration with unpredictable shifting, warning lights, and even a complete inability to drive. This replacement TCM, part number 24276411, is the definitive solution to restore your truck’s performance and reliability. We take the guesswork out of the repair by programming the module with the latest GM software specifically for your truck’s VIN before it ever leaves our facility. This means no extra trips to the dealer for expensive programming—it’s ready for installation right out of the box.
Is Your Sierra 3500 Showing These Symptoms?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Harsh, delayed, or erratic gear shifts.
- ✔ The transmission getting stuck in one gear (limp mode).
- ✔ Check Engine Light or Transmission Warning Light illumination.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0101 (Lost Communication With TCM).
- ✔ Inaccurate gear indicator on the dashboard.
- ✔ Complete loss of communication with the transmission.
Step-by-Step Guide for Your 2015-2016 Sierra 3500 TCM
Installing your new TCM is a straightforward process for a DIYer with basic tools. Following these steps will get your truck shifting smoothly again in no time.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCM: On your Sierra 3500, the TCM is typically mounted on the driver’s side of the fan shroud in the engine bay.
- Disconnect Wiring: Carefully release the locking tabs and unplug the main electrical connectors from the old module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket. Keep the hardware, as you will need it for the new module.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the engine and let it idle for a few minutes. Check for any warning lights. Take the truck for a test drive to confirm that shifting is smooth and responsive. The transmission may go through a brief re-learning period.
A Mechanic’s Field Tale: The Contractor’s Lifeline
A contractor brought in his ’15 Sierra 3500, a critical part of his business. It was stuck in third gear, and he was losing money every hour it was down. The dealership quoted him a long wait time just for diagnostics, plus the cost of a new module and programming. He was looking at days of lost work. We provided him with one of these VIN-programmed TCMs. He installed it himself in his company’s parking lot in under an hour. The truck fired right up, shifted perfectly, and he was back on his way to a job site that same afternoon. It’s not just about fixing a part; it’s about providing a solution that minimizes downtime and keeps people productive.
Compatibility Check: Does It Fit Your Vehicle?
This module is a direct fit for a wide range of GM trucks and SUVs. Please verify your vehicle is on this list:
- Cadillac Escalade/ESV: 2015-2017 (8-speed, opt M5U)
- Chevrolet Camaro: 2016
- Chevrolet Silverado 1500: 2015-2016 (8-speed, opt M5U)
- Chevrolet Silverado 2500/3500: 2015-2016 (6-speed, opt MW7)
- GMC Sierra 1500/Denali 1500: 2015-2016 (8-speed, opt M5U)
- GMC Sierra 2500/3500 & Denali 2500/3500: 2015-2016 (6-speed, opt MW7)
- Cadillac CTS: 2016 (ID 24276411)
- GMC Yukon/Yukon XL 1500: 2015-2016 (8-speed, opt M5U)
This module is compatible with part numbers 24272004 and 24276411.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. It arrives ready for installation, saving you time and money.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we have this information to program it correctly.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills and tools, this is a very manageable job. It typically involves removing a few bolts and unplugging connectors. Always disconnect the battery before starting.
Will this fix my check engine light?
If the check engine light was caused by a faulty TCM and related transmission codes (like P0700 or U0101), this replacement part should resolve the issue and allow the light to be cleared.
What is the transmission re-learn process?
After installation, your vehicle’s transmission may need a short period of normal driving to adapt to the new module. This is an automatic process where the system fine-tunes shift points for optimal performance. You may notice subtle changes in shifting for the first 20-30 miles of driving.