Restore Your Truck’s Shifting Performance and Reliability
Is your 2020-2021 Silverado 3500 experiencing erratic shifting, getting stuck in gear, or throwing transmission-related error codes? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your transmission, the TCM is responsible for every gear change. When it falters, it can cripple your truck’s performance and leave you stranded. I’ve seen it countless times in my 20+ years in the shop—a powerful truck brought to its knees by one small, but critical, electronic module.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We offer this genuine GM TCM, part number 24289415, fully programmed to your truck’s specific Vehicle Identification Number (VIN). This means you can skip the expensive and time-consuming trip to the dealership for programming. We handle it all before we ship, loading the latest GM software updates to ensure optimal performance and compatibility. This is the most direct path to getting your heavy-duty truck back to shifting smoothly and reliably, just like it did from the factory.
From the Diagnostic Bay: The Intermittent Shifting Nightmare
A customer brought in his 2020 Sierra 2500, a sister truck to the Silverado, with a frustrating problem. He said it would occasionally slam into gear, but other times it shifted perfectly. There were no consistent warning lights, just a generic U0101 (Lost Communication with TCM) code stored in history. We checked the wiring harness and connectors—all pristine. We couldn’t replicate the issue in the bay. Instead of just throwing parts at it, we monitored live data on a long test drive. Sure enough, we saw the TCM data stream drop out for a split second right before a harsh shift. The internal circuitry of the original module was failing intermittently under load. Replacing it with a properly programmed 2020-2021 Silverado 3500 TCM like this one solved the issue permanently. The customer was thrilled to have his smooth, predictable truck back.
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 for your GM truck.
- ✔ Harsh or delayed gear engagement
- ✔ Transmission feels like it’s slipping or hunting for gears
- ✔ Vehicle is stuck in one gear (often called “limp mode”)
- ✔ “Service Transmission” or “Check Engine” light is on
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, U0100, or U0101 are present
- ✔ Inaccurate gear display on the instrument cluster
A Straightforward Guide to Installation
Installing your new 2020-2021 Silverado 3500 TCM is a manageable job for a confident DIYer or any professional technician. The module is typically located on the driver’s side of the vehicle for easy access.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Module: On most Silverado and Sierra HD trucks, the TCM is mounted to the left-hand (driver’s side) core support in the engine bay.
- Disconnect Wiring: Carefully unclip the electrical connectors from the old TCM. Press the release tabs firmly and pull straight out. Do not force them.
- Unbolt the Old TCM: Remove the mounting bolts that secure the module to its bracket. Keep the hardware in a safe place.
- Mount the New TCM: Position your new, pre-programmed TCM and secure it using the original mounting bolts.
- Reconnect and Secure: Plug the wiring harnesses back into the new module until they click securely into place. Give them a gentle tug to ensure they’re locked.
- Final Step: Reconnect the negative battery terminal. The vehicle may need to complete a drive cycle for all systems to re-learn, but no additional programming is required.
Verified Vehicle Compatibility
This module, part number 24289415, is a direct replacement for service numbers 24042698, 24043411, 24043413, and 24296206. It is guaranteed to fit the following vehicles:
SIERRA 1500 PICKUP 2019 (New Style) & 2020 (LH core support)
SIERRA 2500 PICKUP 2020-2022 (LH core support)
SIERRA 3500 PICKUP 2020-2022 (LH core support)
SIERRA DENALI 1500 2019-2020 (LH core support)
SIERRA DENALI 2500 2020-2022 (LH core support)
SIERRA DENALI 3500 2020-2022 (LH core support)
SILVERADO 1500 PICKUP 2019 (New Style) & 2020 (LH core support)
SILVERADO 2500 PICKUP 2020-2021 (LH core support)
SILVERADO 3500 PICKUP 2020-2021 (LH core support)
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming work?
After you place your order, simply provide us with your 17-digit VIN. Our technicians will use official GM equipment to flash the module with the exact software and calibrations for your specific vehicle. This ensures it works perfectly right out of the box.
Is any additional programming needed after installation?
No. Because we program the module to your VIN before shipping, no further dealer visits or special tool programming are required. It’s a true plug-and-play installation.
Will this fix a U0101 ‘Lost Communication with TCM’ code?
In most cases, yes. The U0101 code indicates the other modules in the vehicle cannot communicate with the TCM. This is most often caused by an internal failure of the TCM itself. As long as your wiring is intact, this new module should resolve the communication error.
Is this a genuine GM part?
Yes, this is a genuine GM part, ensuring the highest quality, reliability, and perfect compatibility with your vehicle’s systems. We load it with the latest software available from GM.
What is the difference between a TCM and a PCM?
The TCM (Transmission Control Module) specifically controls transmission functions like shift points and torque converter lockup. The PCM (Powertrain Control Module) is the main computer that controls the engine. In many modern trucks like yours, they are separate modules that communicate with each other.