Restore Your Truck’s Smooth Shifting and Reliability
Is your 2015-2016 GMC Sierra 1500 suffering from harsh, unpredictable shifting, a check engine light, or a frustrating “Service Transmission” message on the dash? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your transmission, the TCM is responsible for every shift, and when it falters, it can make your powerful truck feel unreliable and difficult to drive. This isn’t just an annoyance; it’s a critical component failure that can lead to further transmission damage if ignored.
This replacement TCM, part number 24276411, is the definitive solution. We take the guesswork and extra cost out of the repair by programming the module specifically for your truck using your Vehicle Identification Number (VIN). It arrives at your door loaded with the latest GM factory software, ready for a straightforward installation. You get a reliable fix that restores the crisp, decisive shifting you expect from your Sierra, without the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The 8-Speed Shift Problem
Just last week, a 2015 Sierra 1500 with the 8-speed transmission (RPO code M5U) was towed to my bay. The owner was fed up with what he called ‘violent’ 1-2 shifts and the truck occasionally going into limp mode on the highway. A quick scan pulled a U0101 (Lost Communication with TCM) and a P0700 (Transmission Control System Malfunction). In my 20+ years of experience, this combination on these GM trucks almost always points directly to an internal failure in the TCM. Heat cycles and vibration take their toll on the delicate internal circuit board. We replaced it with one of our VIN-programmed modules, performed the quick install, and the truck was shifting like it just rolled off the factory floor. This isn’t a complicated diagnosis, but it requires the right part—one that’s correctly programmed from the start.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Harsh or delayed shifting, especially between 1st and 2nd gear.
- ✔ Vehicle stuck in one gear (limp mode).
- ✔ “Service Transmission” or “Shift to Park” message on the instrument cluster.
- ✔ Check Engine Light illuminated with transmission-related codes.
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, U0101, P060B, or P0751.
- ✔ Inaccurate gear indicator on the dashboard.
A Straightforward Guide to Installation
Replacing the TCM on your Sierra is a manageable job for a confident DIYer or any professional technician. Our pre-programmed module makes the process much simpler.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: On the 2015-2016 Sierra 1500, the TCM is typically mounted on the driver’s side of the radiator core support, near the fan shroud.
- Disconnect Connectors: Carefully release the locking tabs and unplug the electrical connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New Module: 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 vehicle and check for any warning lights. Take it for a test drive to confirm that shifting performance has been restored. While not always required, some vehicles benefit from a transmission adaptive pressure reset with a capable scan tool to speed up the relearning process.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number (24276411 or 24272004) and model. This part is confirmed to fit:
- ✔ 2016 Cadillac CTS
- ✔ 2016 Chevrolet Camaro
- ✔ 2015-2017 Cadillac Escalade / ESV (8-speed, M5U)
- ✔ 2015-2016 GMC Sierra 1500 / Denali 1500 (8-speed, M5U)
- ✔ 2015-2016 Chevrolet Silverado 1500 (8-speed, M5U)
- ✔ 2015-2016 GMC Sierra 2500/3500 & Denali (6-speed, MW7)
- ✔ 2015-2016 Chevrolet Silverado 2500/3500 (6-speed, MW7)
- ✔ 2015-2016 GMC Yukon / Yukon XL 1500 (8-speed, M5U)
Frequently Asked Questions
Do I need to do any extra programming after I install this?
No. This is the biggest benefit of our service. We program the TCM with the latest GM software using your vehicle’s VIN before we ship it. It arrives ready to be installed, saving you a trip to the dealer and expensive programming fees.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information to ensure correct programming.
Will this fix my truck’s harsh shifting?
If the harsh shifting is caused by a faulty TCM, then yes, this part is the correct solution. It’s one of the most common symptoms of TCM failure in these GM trucks, especially those with the 8-speed transmission.
Where is the TCM located on my 2015 Sierra 1500?
On the 2015-2016 Sierra 1500, the Transmission Control Module is typically mounted on the driver’s side (LH) of the radiator core support.
Is this part compatible with part number 24272004?
Yes, this module (24276411) is a fully compatible and updated replacement for the older part number 24272004.