If you’re dealing with erratic shifting, a check engine light, or your 2020-2022 Sierra 3500 going into limp mode, a faulty Transmission Control Module (TCM) is often the culprit. As the electronic brain of your transmission, its proper function is critical for performance, fuel economy, and drivability. This isn’t just a part; it’s a direct solution designed to restore your truck’s factory performance without the exorbitant costs and scheduling headaches of a dealership visit.
We offer a genuine GM TCM, part number 24289415, that arrives at your door fully programmed with the latest GM software updates. The process is simple: after your purchase, you provide us with your vehicle’s VIN. Our certified technicians then program the module specifically for your truck’s configuration. This ensures that when you receive it, the part is ready for installation, eliminating the need for expensive scan tools or a trip to the dealer for programming. This is the most efficient way to get your heavy-duty truck back to work.
From the Diagnostic Bay: A Common Sierra TCM Failure
Just last week, a 2021 Sierra 2500 was towed into my shop. The owner reported extremely harsh shifts between 2nd and 3rd gear and said the truck would occasionally feel like it was in neutral, even when in Drive. The check engine light was on, and my scan tool pulled a U0101 code – ‘Lost Communication with TCM.’ After verifying the integrity of the wiring harness and checking for power and ground at the TCM connector (located on the LH core support), it was clear the module itself had failed internally. This is a scenario I’ve seen dozens of times on these late-model GM trucks. We installed one of our pre-programmed modules, cleared the codes, and the truck was shifting perfectly on the test drive. The customer saved hundreds compared to the dealer quote and was back on the road the same day.
Is Your Truck Exhibiting These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need for your Sierra 3500 Transmission Control Module.
- ✔ Harsh, delayed, or erratic gear shifts
- ✔ Vehicle gets stuck in one gear (limp mode)
- ✔ Check Engine Light is illuminated
- ✔ “Service Transmission” message on the instrument cluster
- ✔ Diagnostic Trouble Codes (DTCs) such as U0100, U0101, or other communication errors
- ✔ Poor fuel economy directly related to shifting issues
A Straightforward Guide to Installation
Installing your new pre-programmed TCM is a manageable job for a confident DIYer or any professional technician. Since the programming is already done, no special computers are required for the installation itself.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCM: On most 2019+ Silverado and Sierra trucks, the TCM is mounted to the left-hand (driver’s side) core support, near the radiator.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Inspect the connectors for any corrosion or damage.
- Remove the Module: Unbolt the old TCM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New TCM: Mount your new, pre-programmed module onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the electrical connectors back into the new TCM, ensuring they click into place. Reconnect the negative battery terminal.
- Final Steps: Start the vehicle. While no further programming is needed, it’s always good practice to use a basic scan tool to clear any stored fault codes from the system. Take the vehicle for a test drive to confirm smooth shifting.
Guaranteed Fitment for Your GM Vehicle
This module, part number 24289415, is a direct replacement for service numbers 24042698, 24043411, 24043413, 24296206 and is verified to fit the following vehicles. Please ensure your vehicle is on this list before ordering.
- ✔ CAMARO: 2022-2023
- ✔ SIERRA 1500 PICKUP: 2019 (New Body 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 Body Style), 2020
- ✔ SILVERADO 2500 PICKUP: 2020-2021
- ✔ SILVERADO 3500 PICKUP: 2020-2021
Frequently Asked Questions
Do I need to do any additional programming after installation?
No. This module comes fully programmed to your vehicle’s VIN. The only recommended step is to clear any old fault codes with a standard OBD2 scanner after installation. A transmission relearn procedure may be beneficial but is not always required.
What information do you need from me?
After you place your order, we require your 17-digit Vehicle Identification Number (VIN) to program the module correctly. This ensures perfect compatibility with your truck’s specific options and software.
Is this part a genuine GM component?
Yes, this is a genuine GM part (24289415) loaded with the latest official GM software. We believe in using quality components to ensure a lasting and reliable repair.
Will this fix my U0100 / U0101 communication codes?
In the vast majority of cases, yes. These codes indicate a loss of communication with the TCM. Provided your vehicle’s wiring is intact, replacing a failed TCM is the correct fix for these diagnostic trouble codes.
How is this different from buying a part from the dealership?
Our solution saves you time and money. We provide the same genuine GM part, but it arrives pre-programmed. This allows you or your mechanic to install it without needing a separate, costly appointment at the dealership for programming services.