Restore Your Truck’s Shifting Performance and Reliability
If you’re dealing with the frustration of a transmission that’s slamming into gear, refusing to shift, or has put your truck into a crippling “limp mode,” you know how disruptive it can be. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can bring even the toughest trucks to a standstill. This isn’t just an annoyance; it’s a critical failure that compromises your vehicle’s performance and safety. This genuine GM Transmission Control Module, service part number 24289415, is the definitive solution for your 2020-2021 Silverado 3500 TCM and other compatible GM vehicles.
The TCM is the brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, communication between the engine and transmission breaks down, leading to the erratic behavior you’re likely experiencing. Our service takes the guesswork and high costs out of the equation. We provide a module that is professionally programmed with the latest GM software, matched specifically to your vehicle’s VIN. This means you get a part that is ready for installation right out of the box, saving you from a costly trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in his 2020 Sierra 2500 with a complaint that was driving him crazy. The truck would intermittently get stuck in 3rd gear, and the check engine light was on. He’d already been to another shop that couldn’t pinpoint the issue. When I connected my scan tool, I found a U0100 (Lost Communication With TCM) code. After verifying the wiring and connectors were solid—a crucial first step—I knew the module itself was the culprit. These newer TCMs are sensitive. We ordered this exact part, had it programmed to his VIN before it arrived, and installed it. The total time in my bay was less than an hour. The customer called a week later, thrilled that his heavy-duty truck was finally shifting like new again. This pre-programmed solution saved him time, money, and a massive headache.
Is Your GM Truck Exhibiting These Telltale Signs?
A failing TCM often gives clear warnings. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh or delayed shifting between gears
- ✔ The transmission seems stuck in one gear (limp mode)
- ✔ An illuminated Check Engine Light with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0100
- ✔ Inaccurate gear indicator display on the dashboard
- ✔ A noticeable drop in fuel economy due to inefficient shifting
A Straightforward Guide to Installation
Replacing the TCM is a job most DIYers with basic mechanical skills can handle. On most GM trucks, it’s located on the left-hand (driver’s side) core support, making it relatively accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: Find the TCM, typically mounted near the radiator on the driver’s side frame rail or core support.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out. Avoid pulling on the wires themselves.
- Remove Mounting Bolts: Unbolt the old TCM from its mounting bracket. There are usually two or three bolts holding it in place.
- Install the New TCM: Mount your new, pre-programmed module in place and tighten the bolts securely.
- Reconnect Everything: Plug the electrical connectors back into the new TCM until they click, and then reconnect your battery terminal.
- Final Check: Start the vehicle and check for proper gear engagement and ensure the check engine light is off. A short drive will confirm the repair is successful.
Verified Vehicle Compatibility List
This module is a direct replacement for service numbers 24042698, 24043411, 24043413, 24289415, and 24296206. It is guaranteed to fit the following vehicles:
- CAMARO 2022-2023 (underhood, LH frame rail)
- SIERRA 1500 PICKUP 2019 (new style, mirrors on door skin)
- SIERRA 1500 PICKUP 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, mirrors on door skin)
- SILVERADO 1500 PICKUP 2020
- SILVERADO 2500 PICKUP 2020-2021
- SILVERADO 3500 PICKUP 2020-2021
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you simply provide us with your vehicle’s 17-digit VIN. We use this information to load the latest official GM software for your specific vehicle onto the module before we ship it. This ensures perfect compatibility.
Is any additional programming needed after installation?
No. Because this module arrives pre-programmed to your VIN, no further dealer visits or special scan tools are required for programming. It is designed to be a plug-and-play solution.
Is this the correct part for my truck?
This module replaces several common service numbers. Please check your original part number or consult our compatibility list. If your vehicle and year are listed, and you are experiencing TCM-related symptoms, this is the correct part for a reliable fix.
What tools do I need for installation?
You will typically only need basic hand tools, such as a socket set and a wrench to disconnect the battery. No specialized electronic equipment is necessary for this installation.
Will this fix my check engine light?
If your check engine light is on due to a fault within the TCM (like codes U0100 or P0700), replacing it with this correctly programmed unit will resolve the issue and allow the code to be cleared.