Is your 2015-2016 GMC Sierra 3500 HD giving you trouble? If you’re experiencing hard, erratic shifting, getting stuck in gear, or seeing a persistent Check Engine Light, a failing Transmission Control Module (TCM) is the likely culprit. As the brain of your automatic transmission, a faulty TCM can make your powerful truck feel unreliable and unsafe. Don’t let shifting problems sideline your workhorse. This direct-replacement TCM, part number 24276411, is the definitive solution to restore your transmission’s performance and your peace of mind.
Over my 20 years in automotive diagnostics, I’ve seen countless heavy-duty trucks come into the shop with transmission issues that owners feared would lead to a multi-thousand dollar rebuild. More often than not, the root cause was a failing electronic module. This isn’t just a part; it’s a solution that saves you from expensive dealership visits and complex programming procedures. We handle the critical step for you: each module is professionally programmed with the latest GM software, specifically matched to your truck’s Vehicle Identification Number (VIN). This ensures seamless communication with your vehicle’s other systems right out of the box.
A Technician’s Notebook: The Intermittent Shifting Nightmare
A customer brought in his 2016 Sierra 3500 with the 6-speed Allison. The complaint was maddeningly intermittent: most days it drove fine, but then, without warning, it would slam into gear or refuse to shift out of 3rd. No consistent codes were stored, just a history of U0100 (Lost Communication with TCM). We checked wiring and connectors, which all looked pristine. After swapping in a test module, the problem vanished. The original TCM had an internal fault that only appeared under specific temperature and vibration conditions. Replacing it with a pre-programmed unit like this one was the key. It saved the customer from days of diagnostic labor and the uncertainty of just ‘living with it’.
Is Your Truck Exhibiting These TCM Failure Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Harsh or delayed gear engagement
- ✔ Vehicle gets stuck in one gear (limp mode)
- ✔ Unpredictable upshifting or downshifting
- ✔ Check Engine Light is on with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) like P0700, P0751, or U0100
- ✔ Decreased fuel economy due to inefficient shifting
A Straightforward Guide to TCM Installation
Installing your new 2015-2016 Sierra 3500 TCM is a manageable job for a confident DIYer or any professional technician. Since we program it beforehand, you won’t need any special scan tools for setup.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- Locate the TCM: On most 2015-2016 Sierra HD trucks, the TCM is located on the driver’s side, attached to the fan shroud or near the core support. It’s a silver metal box with large electrical connectors.
- Disconnect the Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight off the module. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the bolts. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. In some cases, a transmission relearn procedure may be beneficial, but the truck should be operational immediately.
Verified Vehicle Compatibility List
This module is a direct replacement for part numbers 24276411 and 24272004. It is guaranteed to fit the following GM vehicles with the specified options:
- 2016 Cadillac CTS: (LH front rail), ID 24276411
- 2016 Chevrolet Camaro: (Underhood, LH frame rail)
- 2015-2017 Cadillac Escalade / Escalade ESV: (LH radiator), 8-speed (opt M5U)
- 2015-2016 GMC Sierra 1500 / Denali 1500: (LH core support), 8-speed (opt M5U)
- 2015-2016 GMC Sierra 2500 HD / Denali 2500: (LH fan shroud), 6-speed (opt MW7)
- 2015-2016 GMC Sierra 3500 HD / Denali 3500: (LH fan shroud), 6-speed (opt MW7)
- 2015-2016 Chevrolet Silverado 1500: (LH core support), 8-speed (opt M5U)
- 2015-2016 Chevrolet Silverado 2500 HD: (LH fan shroud), 6-speed (opt MW7)
- 2015-2016 Chevrolet Silverado 3500 HD: (LH fan shroud), 6-speed (opt MW7)
- 2015-2016 GMC Yukon / Yukon XL 1500: (LH radiator), 8-speed (opt M5U)
By purchasing this 2015-2016 Sierra 3500 TCM, you are choosing a reliable, hassle-free repair that restores your truck’s factory performance. Simply provide your VIN at checkout, and we’ll ship a module that’s ready to install.