Restore Your Truck’s Shifting and Reliability
Is your 2015-2016 Sierra Denali 2500 suffering from erratic shifting, delayed gear engagement, or a persistent “Service Transmission” warning? You’re not alone. The Transmission Control Module (TCM) is the electronic brain of your automatic transmission, and when it fails, it can cause a host of frustrating and concerning problems. This isn’t just an annoyance; it’s a critical component for your truck’s performance and safety. Driving with a faulty TCM can lead to further transmission damage and leave you stranded.
We offer a straightforward, reliable solution: a replacement TCM, part number 24272004, that arrives at your door fully programmed to your specific vehicle. Using the Vehicle Identification Number (VIN) you provide, we flash the module with the latest, most stable software updates directly from GM. This process ensures perfect communication between the TCM, the engine, and the transmission, restoring the crisp, predictable shifting you expect from your truck. By handling the programming beforehand, we eliminate the need for an expensive trip to the dealership, saving you time, towing fees, and high labor costs.
From the Diagnostic Bay: A Common Sierra Scenario
I’ve seen this exact issue hundreds of times in my 20+ years as a technician. A customer brings in a 2016 Sierra 2500 with the 6-speed Allison (RPO code MW7). The complaint is harsh 2-3 shifts and an intermittent check engine light. A quick scan reveals code P0700 (Transmission Control System Malfunction) and sometimes U0101 (Lost Communication with TCM). While other issues can cause these codes, a failing TCM is the most common culprit on these trucks. In the past, this meant a new module and a tow to the dealer for programming. Now, with this pre-flashed module, the repair is a simple swap. The customer is back on the road in under an hour, without the dealership hassle. It’s the most efficient fix for one of the most common problems on these GM HD trucks.
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 the likely solution.
- ✔ Check Engine Light or “Service Transmission” warning is illuminated.
- ✔ Storing diagnostic trouble codes (DTCs) like P0700, P0751, or U0101.
- ✔ Harsh, erratic, or delayed shifting between gears.
- ✔ Getting stuck in one gear (limp mode).
- ✔ Inaccurate gear indicator on the dashboard.
- ✔ Complete loss of forward or reverse gears.
A Straightforward Guide to Installation
Because we handle the programming, installation is a direct swap. This process can typically be completed with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the TCM: On the 2015-2016 Sierra Denali 2500/3500, the TCM is typically 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. 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: Firmly plug the electrical connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and allow it to idle. The check engine light should be off. Test drive the vehicle to confirm that shifting is smooth and correct. No further programming is required!
Verified Vehicle Compatibility
This module is a direct-fit replacement for part numbers 24272004 and 24276411. It is guaranteed to fit the following GM vehicles with the specified options:
- Cadillac Escalade/ESV (2015-2017): 8-speed (M5U)
- Chevrolet Camaro (2016): (underhood, LH frame rail)
- Chevrolet Silverado 1500 (2015-2016): 8-speed (M5U)
- Chevrolet Silverado 2500/3500 (2015-2016): 6-speed (MW7)
- GMC Sierra 1500 / Denali 1500 (2015-2016): 8-speed (M5U)
- GMC Sierra 2500/3500 / Denali 2500/3500 (2015-2016): 6-speed (MW7)
- GMC Yukon / Yukon XL 1500 (2015-2016): 8-speed (M5U)
- Cadillac CTS (2016): ID 24276411
IMPORTANT: After your purchase, please send us a message with your vehicle’s 17-digit VIN to ensure we can program the module correctly before shipment.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN is essential for us to load the correct GM-certified software for your specific truck. This includes details about the transmission type, axle ratio, and tire size, ensuring perfect operation right out of the box.
Is any additional programming needed after I install it?
No. This is the biggest benefit of our service. The TCM arrives fully programmed and ready for installation. Simply plug it in, and you’re ready to go. No need for expensive scan tools or a trip to the dealer.
Will this fix a “No Communication” issue with my old TCM?
In most cases, yes. A complete internal failure of the module is a common cause for communication loss codes like U0100 or U0101. This replacement module will restore that communication link.
What happens if I forget to provide my VIN?
To prevent shipping delays, we will reach out to you to request the VIN. We cannot ship the module until it has been programmed, so providing the VIN at the time of purchase is the fastest way to get your part.
Is this compatible with both the 6-speed and 8-speed transmissions?
Yes, this module hardware is used across various GM platforms with both 6-speed (like in the HD trucks) and 8-speed transmissions (like in the 1500-series trucks and SUVs). The VIN-specific programming we perform ensures it works correctly for your exact transmission type.