Restore Your Truck’s Shifting Performance and Reliability
If you’re dealing with erratic shifting, a ‘Service Transmission’ warning, or your 2020-2021 Silverado 2500 has gone into limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good truck. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and safety. That’s why we offer this direct-fit, VIN-programmed TCM as a straightforward and reliable solution.
This isn’t just a part in a box. It’s a complete fix. We take the hassle out of the repair by pre-programming this module to your truck’s specific Vehicle Identification Number (VIN) before it even leaves our facility. This means it arrives with the latest GM software updates already installed, allowing you to bypass expensive dealership programming fees and complex tool requirements. You get a component that is ready for installation right out of the box, designed to restore the crisp, predictable shifting you expect from your GM truck.
From the Diagnostic Bay: The Intermittent Shifting Nightmare
A customer brought in a 2020 Sierra 2500—same platform as the Silverado—with a complaint that stumped two other shops. The truck would occasionally slam into gear, but then drive perfectly for days. No consistent check engine light, just random, harsh shifts. After hooking up my pro-level scan tool and monitoring live data, I noticed the TCM would momentarily drop communication right before a harsh shift event. It wasn’t setting a hard code like U0100 every time, making it incredibly tricky to diagnose. We confirmed the wiring was solid, which pointed directly to an internal failure in the original TCM. Installing a new, correctly programmed module like this one solved the problem instantly. It’s a classic example of how a failing 2020-2021 Silverado 2500 TCM can cause frustratingly intermittent issues.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh or delayed shifting between gears
- ✔ Vehicle stuck in one gear (limp mode)
- ✔ “Service Transmission” or Check Engine Light illuminated
- ✔ Inaccurate gear indicator on the dashboard
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0606, or the dreaded U0100 (Lost Communication With TCM)
- ✔ A noticeable decrease in fuel economy due to inefficient shifting
A Straightforward Guide to Installation
Replacing the TCM on these trucks is a job most DIYers with basic tools can handle. The module is typically located on the driver’s side (LH) core support in the engine bay. Always consult a service manual for your specific vehicle, but here is a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the systems to discharge.
- Locate the TCM: Find the module on the driver’s side of the radiator core support. It will have several electrical connectors attached.
- Disconnect Connectors: Carefully release the locking tabs on each electrical harness and pull them straight out. Do not force them.
- Remove Mounting Bolts: Unbolt the old TCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the bolts.
- Reconnect Everything: Plug the electrical connectors firmly back 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 is smooth and responsive. No further programming is required!
Guaranteed Fitment for Your GM Vehicle
This module, service part number 24289415, is the correct replacement for original part number 24042698 and other service numbers listed below. It is guaranteed to fit the following makes and models:
- ✔ CAMARO: 2022-2023
- ✔ SIERRA 1500 PICKUP: 2019 (New Style), 2020
- ✔ SIERRA 2500 PICKUP: 2020-2022
- ✔ SIERRA 3500 PICKUP: 2020-2022
- ✔ SIERRA DENALI 1500: 2019-2020
- ✔ SIERRA DENALI 2500/3500: 2020-2022
- ✔ SILVERADO 1500 PICKUP: 2019 (New Style), 2020
- ✔ SILVERADO 2500 PICKUP: 2020-2021
- ✔ SILVERADO 3500 PICKUP: 2020-2021
This is the definitive solution for your 2020-2021 Silverado 2500 TCM and a wide range of other modern GM trucks and cars.
Do I need to do anything after installing this TCM?
Do I need to do anything after installing this TCM?
No. Because we program the module to your VIN before shipping, it is a true plug-and-play installation. No additional programming or relearn procedures are required. Just install it and drive.
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 will provide clear instructions on how to do this. We cannot ship the part until we receive your VIN for programming.
What is the difference between all the part numbers listed?
GM often uses multiple service numbers (like 24042698, 24289415, etc.) for the same physical part over its production life. This module is a direct replacement for all the compatible service numbers listed, ensuring it will function correctly in your vehicle.
Will this fix a U0100 code?
In the vast majority of cases, yes. The U0100 code indicates a loss of communication with the TCM. Provided the vehicle’s wiring and connectors are intact, a faulty TCM is the root cause, and replacing it with this pre-programmed unit will resolve the code and restore communication.