Restore Peak Transmission Performance in Your GM Truck
If you’re dealing with the frustration of a check engine light, harsh shifting, or your truck unexpectedly going into limp mode, you know how disruptive a faulty Transmission Control Module (TCM) can be. As a technician with over two decades of experience, I’ve seen firsthand how a failing TCM can make a powerful truck feel unreliable. This isn’t just an inconvenience; it’s a critical component that governs your transmission’s every move. This replacement TCM, part number 24289415, is the definitive solution to get your vehicle operating smoothly and dependably again.
The core of this offering is our complimentary VIN programming service. Before this module ships, we flash it with the latest official GM software specific to your truck’s Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with your vehicle’s other computers, like the ECM and BCM, right out of the box. You get to bypass the expensive and time-consuming trip to the dealership for programming, turning a complex repair into a straightforward component swap. This is the exact process we use in our shop to guarantee a successful repair and get customers back on the road with confidence.
A Technician’s Notebook: The Intermittent Shifting Mystery
A 2020 Silverado 3500 with the 10-speed transmission came into my bay with a complaint that stumped two other shops: intermittent, bone-jarring shifts between 3rd and 4th gear, but no consistent check engine light. The owner was frustrated, having been told they couldn’t find anything wrong. When I hooked up my professional scan tool, I noticed intermittent communication loss codes (U0101) stored in the history. While the TCM wasn’t completely dead, its internal processor was failing under load, causing it to momentarily drop communication. This is a classic symptom I’ve diagnosed on dozens of these GM platforms. We installed a VIN-programmed TCM, and after a 20-mile test drive, the truck shifted like it just rolled off the factory line. It’s not always about a hard failure; sometimes, it’s about restoring the precision your transmission needs.
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. Look out for:
- ✔ Erratic or harsh shifting between gears
- ✔ Vehicle stuck in one gear (limp mode)
- ✔ Delayed engagement when shifting into Drive or Reverse
- ✔ Check Engine Light illuminated on the dash
- ✔ “Service Transmission” message appearing in the driver information center
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, U0100, or U0101 stored in the system
A Straightforward Guide to Installation
Installing your new 2020-2021 Silverado 3500 TCM is a manageable job for a DIYer with basic tools. On most of these trucks, the module is located on the driver’s side (LH) core support, near the radiator.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the TCM: Find the Transmission Control Module. It’s a silver box with multiple electrical connectors, typically mounted to the radiator core support on the driver’s side.
- Disconnect Electrical Connectors: Carefully release the locking tabs on each of the wiring harness connectors and pull them straight out from the module. Do not force them.
- Unbolt the Old Module: Using an appropriate socket, remove the bolts or nuts securing the old TCM to its bracket.
- Install the New Module: Mount your new, pre-programmed TCM in place and tighten the mounting hardware securely.
- Reconnect Everything: Plug the wiring harness connectors back into the new module until they click, ensuring a solid connection. Reconnect the negative battery terminal.
- Final Steps: Start the vehicle and check for any warning lights. A short test drive will allow the transmission to complete its relearn process with the new module.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. We guarantee compatibility if your vehicle is listed below. This part replaces service numbers 24042698, 24043411, 24043413, 24289415, and 24296206.
SIERRA 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SIERRA 1500 PICKUP 20 Transmission Control; (LH core support)
SIERRA 2500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA 3500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA DENALI 1500 19-20 Transmission Control; (LH core support)
SIERRA DENALI 2500 20-22 Transmission Control; (LH core support)
SIERRA DENALI 3500 20-22 Transmission Control; (LH core support)
SILVERADO 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SILVERADO 1500 PICKUP 20 Transmission Control; (LH core support)
SILVERADO 2500 PICKUP 20-21 Transmission Control; (LH core support)
SILVERADO 3500 PICKUP 20-21 Transmission Control; (LH core support)
How does the VIN programming work?
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to download the latest GM-certified software for your specific vehicle and flash it onto the TCM. This ensures it works perfectly with your truck’s configuration upon arrival.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set and ratchet are all that’s typically needed to replace the module. Because the module comes pre-programmed, you do not need a dealership scan tool.
Is this a new or used part?
This is a high-quality, tested replacement part guaranteed to meet or exceed original equipment performance. We ensure every module is fully functional and ready for installation.
Will this fix my P0700 trouble code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While a faulty TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you’re also experiencing shifting problems or communication codes like U0100, replacing the TCM is the most probable fix.
What if I order the wrong part?
Our VIN programming process helps prevent incorrect orders. By matching the software to your VIN, we also verify compatibility. If you are unsure, please contact us with your VIN before ordering, and our expert team will confirm the correct part for your truck.