Restore Your Truck’s Shifting Performance
If you’re dealing with the frustration of a transmission that’s slamming into gear, refusing to shift, or putting your truck into a limp mode, you know how disruptive it can be. For a workhorse like a 2015-2016 GMC Sierra 3500, reliable transmission performance isn’t a luxuryâit’s a necessity. As a technician with over two decades of experience, I’ve seen countless transmission issues that weren’t caused by internal mechanical failure, but by a faulty Transmission Control Module (TCM). Heat cycles and vibrations, especially in a heavy-duty truck, take their toll on these sensitive electronics, leading to the erratic behavior you’re likely experiencing.
This isn’t just a replacement part; it’s a direct solution. We offer a genuine GM Transmission Control Module, part number 24276411, that arrives at your door completely programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the latest factory software and communicates flawlessly with your vehicle’s other systems, just as the original did. By providing your VIN at checkout, you eliminate the need for an expensive trip to the dealership for programming. You get a part that’s ready for installation right out of the box, saving you significant time and money.
Case Study: A Tricky Diagnosis
A customer brought in his 2016 Sierra 2500 with the 6-speed Allison, complaining of harsh 2-3 shifts and occasional loss of gear indication on the dash. His scanner was throwing a generic transmission code, P0700, and a solenoid performance code. The initial thought was a failing solenoid pack inside the transmissionâan expensive, labor-intensive job. However, experience has taught me to always check the controller first. After hooking up my professional scan tool, I noticed the TCM would intermittently drop communication. We tested the wiring and found it was solid. The root cause was the 2015-2016 Sierra 3500 TCM itself failing internally. By replacing the module with a VIN-programmed unit, we solved all the symptoms without ever needing to open the transmission pan, saving the customer over a thousand dollars and a full day of downtime.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, this module is the likely solution.
- â Harsh, delayed, or erratic shifting
- â Vehicle gets stuck in one gear (limp mode)
- â “Service Transmission” or Check Engine light is illuminated
- â Diagnostic Trouble Codes (DTCs) such as P0700, P0601, or U0100 (Lost Communication with TCM) are present
- â Incorrect gear display on the instrument cluster
- â Complete loss of drive or reverse gears
A Straightforward Guide to Installation
Installing your new 2015-2016 Sierra 3500 TCM is a manageable job for a DIYer with basic tools. The module is typically located on the driver’s side of the fan shroud, making it accessible from under the hood.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCM: Open the hood and find the TCM mounted to the left-hand (driver’s side) fan shroud.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket on the fan shroud.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure the bolts.
- Reconnect Everything: Plug the electrical connectors firmly back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and check for any warning lights. Take it for a test drive to confirm that shifting is smooth and correct. In some cases, a transmission adaptive pressure reset may be beneficial but is often not required.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please confirm your model and options below. This part is a compatible replacement for part numbers 24272004 and 24276411.
- Cadillac Escalade/ESV (2015-2017): 8-speed (opt M5U)
- Chevrolet Camaro (2016): Underhood, LH frame rail
- 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)
- GMC Yukon / Yukon XL 1500 (2015-2016): 8-speed (opt M5U)
- And more… See full fitment list for details.