Is your 2020-2022 Sierra 2500 HD experiencing harsh, delayed, or erratic shifting? Are you stuck in limp mode or staring at a frustrating check engine light? A failing Transmission Control Module (TCM) is one of the most common culprits behind these drivability issues. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline even the toughest trucks. This isn’t just an inconvenience; it affects your truck’s performance, fuel economy, and reliability.
This is a direct-fit replacement Transmission Control Module, part number 24289415, designed to restore the precise, smooth shifting you expect from your GM truck. The biggest challenge with replacing a modern TCM is the complex programming required. We eliminate that headache entirely. Before this module ships, we flash it with the latest official GM software, specifically programmed to your truck’s unique Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming and no special scan tools required for setup. It’s a straightforward solution designed to get you back on the road with confidence.
From the Diagnostic Bay: The Intermittent Shifting Nightmare
A customer brought in his 2021 Sierra 2500 with a perplexing issue. He said, ‘Some days it shifts like a dream, other days it slams into gear.’ There were no consistent codes, just a history log of a U0100 (Lost Communication with TCM). We checked the wiring harness and connectors—all pristine. On a hunch, we monitored the TCM’s live data during a long test drive. Sure enough, we saw the module’s internal temperature spike just before it would drop communication and cause a harsh shift. The internal circuitry was failing under load. Replacing the module was the only fix. This pre-programmed 2020-2022 Sierra 2500 TCM would have saved him hours of diagnostic time and got his work truck back on the job faster.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module may need replacement:
- ✔ Harsh or clunky gear engagement
- ✔ Delayed shifting or getting stuck in one gear
- ✔ Vehicle entering ‘Limp Mode’ with reduced power
- ✔ Check Engine Light illuminated with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0100
- ✔ Inaccurate gear indicator on the dashboard
- ✔ Poor fuel economy due to inefficient shifting
A Straightforward Guide to Installation
Installing your new 2020-2022 Sierra 2500 TCM is a manageable job for a DIY enthusiast or a quick task for a professional. For most Sierra and Silverado models, the module is located on the driver’s side (LH) core support behind the headlight.
- Safety First: Always disconnect the negative terminal from your truck’s battery and wait a few minutes to ensure the system is fully discharged.
- Locate the TCM: On your Sierra/Silverado, find the module mounted to the LH core support. You may need to remove the air intake box for easier access.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out. Never tug on the wires themselves. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the original bolts.
- Reconnect and Secure: Plug the electrical connectors firmly into the new module until they click into place. Reconnect your battery terminal.
- Final Check: Start the vehicle and allow it to idle. Check for any warning lights and take it for a test drive to confirm smooth shifting has been restored. No further programming is needed.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for multiple service numbers, including 24042698, 24043411, 24043413, 24289415, and 24296206. 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: 2020-2022
- ✔ SIERRA DENALI 3500: 2020-2022
- ✔ SILVERADO 1500 PICKUP: 2019 (New Style), 2020
- ✔ SILVERADO 2500 PICKUP: 2020-2021
- ✔ SILVERADO 3500 PICKUP: 2020-2021
By providing your VIN upon purchase, you ensure this 2020-2022 Sierra 2500 TCM arrives ready for installation, with the correct software for your truck’s specific configuration.
How does the VIN programming work?
How does the VIN programming work?
After you complete your purchase, you’ll need to provide us with your 17-digit Vehicle Identification Number (VIN). Our technicians use this VIN to access the official GM service database and load the exact software and calibrations your vehicle requires. This ensures perfect communication between the TCM and your truck’s other modules.
Is any additional programming needed after installation?
No. Because we program the module to your VIN before shipping, it is a true plug-and-play solution. You will not need to visit a dealer or use a high-end scan tool for setup, saving you significant time and money.
What if I have a different service number on my old part?
This module, 24289415, is the latest iteration and replaces several older service numbers, including 24042698, 24043411, and 24043413. As long as your vehicle is on our compatibility list, this part will function correctly.
Will this fix a ‘No Communication’ code like U0100?
In many cases, yes. A U0100 code often indicates an internal failure of the TCM itself. While you should always check the wiring and connectors first, a faulty module is a very common cause for this code. Replacing it with this tested unit is a reliable fix.
Where is the TCM located on my 2021 Sierra 2500?
For the 2020-2022 Sierra 2500/3500 and Silverado 2500/3500, the TCM is typically mounted on the left-hand (driver’s side) radiator core support, often near the air filter housing.