Restore Crisp, Confident Shifting to Your GM Truck
If you’re dealing with erratic shifting, a check engine light, or a “Service Transmission” warning on your 2020-2021 Silverado 2500, a failing Transmission Control Module (TCM) is the likely culprit. As a technician with over 20 years of experience, I’ve seen these symptoms countless times. A faulty TCM can turn a powerful, reliable truck into a source of constant frustration, leaving you stuck in limp mode or guessing what gear you’ll get next. This isn’t just an annoyance; it’s a safety concern. This genuine GM TCM, part number 24289415, is the definitive solution to get your truck’s transmission performing exactly as the factory intended.
The biggest hurdle in replacing a modern TCM is the complex programming required. Without it, the new module is just a paperweight. That’s where we come in. We eliminate the need for an expensive trip to the dealership by professionally programming this module to your truck’s specific Vehicle Identification Number (VIN) before it ships. We load it with the very latest GM-released software, ensuring all known bugs are addressed and performance is optimized. This gives you a true plug-and-play repair, saving you time, money, and the headache of scheduling a dealer appointment.
Case Study: A Tricky Diagnosis
A customer brought in a 2020 Sierra 2500 with a complaint that was tough to pin down. He said it would occasionally slam into gear from a stop, but not always. No check engine light was on. After a long test drive, I finally felt it—a harsh 1-2 shift that shook the whole truck. Back in the bay, I scanned for codes and found a stored history code, U0100 (Lost Communication with TCM), that hadn’t triggered the light. These intermittent communication drops are a classic sign of a TCM on its way out. The internal electronics begin to fail under certain heat or vibration conditions. We replaced his module with a VIN-programmed unit like this one, and the problem was solved completely. It’s often these subtle, intermittent issues that point directly to the module itself.
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:
- ✔ Harsh, delayed, or erratic shifting
- ✔ Vehicle stuck in one gear (limp mode)
- ✔ “Service Transmission” or “Shift to Park” message on the dash
- ✔ Check Engine Light with transmission-related codes like P0700 or U0100
- ✔ Inaccurate gear indicator display
- ✔ Complete loss of drive or reverse gears
A Straightforward Guide to Installation
Installing your new 2020-2021 Silverado 2500 TCM is a job most DIYers or any professional mechanic can handle with basic tools. Since we’ve done the programming, no special computers are needed.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCM: On most Silverado and Sierra HD models, the TCM is mounted to the left-hand (driver’s side) core support, near the radiator.
- Disconnect and Remove: Carefully unplug the main electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Ensure it’s secure. Reconnect the electrical harnesses, making sure they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. In many cases, a transmission fast-learn or relearn procedure with a capable scan tool is recommended for optimal shift quality, but the truck will be operational immediately.
Verified Vehicle Compatibility
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) & 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
How does the VIN programming work?
After you place your order, you will need to provide us with your 17-digit VIN. Our technicians use this number to access the latest official GM software for your specific vehicle configuration and flash it directly onto the module before shipping.
What does a Transmission Control Module (TCM) do?
The TCM is the ‘brain’ of your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses that information to control clutch engagement, hydraulic pressure, and shift points to ensure smooth and efficient operation.
Is any additional programming required after installation?
No, this module arrives ready to install. Because it is pre-programmed to your VIN, you do not need to take it to a dealer for software flashing. A transmission relearn procedure with a scan tool is sometimes beneficial for the absolute best shift feel but is not always required for the vehicle to function correctly.
How do I know this part will fit my truck?
Please check the detailed fitment list provided above. As long as your vehicle’s year, make, and model are listed, this part is a guaranteed fit. Providing your VIN for programming also serves as a final compatibility check.
Will this fix my check engine light?
If your check engine light is on due to a transmission-related fault code (like P0700 or communication errors), replacing the faulty TCM will resolve the issue and allow the code to be cleared.