Restore Your Truck’s Shifting Performance and Reliability
Is your Silverado or Sierra experiencing erratic shifting, delayed engagement, or a persistent ‘Service Transmission’ light on the dash? These are classic signs of a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfectly good truck. It’s the central computer for your transmission, and when it fails, it can mimic serious internal transmission problems, causing a lot of stress and diagnostic headaches. This module is the definitive solution, providing a reliable fix that gets you back on the road with confidence.
We take the guesswork and extra cost out of the repair. This genuine GM TCM, compatible with service number 24296206, arrives at your door pre-programmed with the latest factory software specifically for your vehicle. All we need is your VIN during checkout. This critical step means you can bypass the dealership’s expensive programming fees and long wait times. For the professional mechanic, this is a huge time-saver, allowing you to complete the job in your own bay. For the DIY enthusiast, it makes a complex-sounding job surprisingly straightforward. This is the smart, efficient way to replace a faulty 2020-2021 Silverado 2500 TCM.
A Technician’s Notebook: The Misleading Fault Code
A 2020 Sierra 2500 was towed into the shop with a ‘Service Transmission’ message and harsh, erratic shifting. The initial scan pulled a P0700 (Transmission Control System Malfunction) and a U0101 (Lost Communication with TCM). While U0101 points directly to the module, a less experienced tech might chase wiring issues for hours. In my experience, especially on these newer trucks, the module itself is the most common point of failure. After verifying power and ground at the TCM connector—a crucial 5-minute check—we confirmed the module was unresponsive. We installed a pre-programmed TCM, cleared the codes, and the truck was shifting perfectly within 30 minutes. This part saved the customer from a potential misdiagnosis and a much more expensive, unnecessary repair.
Is Your Truck Exhibiting These Transmission Problems?
A failing TCM can cause a variety of symptoms. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh or erratic shifting between gears
- ✔ Getting stuck in one gear (limp mode)
- ✔ ‘Service Transmission’ or Check Engine Light illuminated
- ✔ Delayed engagement when shifting into Drive or Reverse
- ✔ Communication error codes like U0101, U0100
- ✔ General transmission fault codes like P0700
- ✔ Inaccurate gear indicator display
A Straightforward Guide to Installation
Replacing the 2020-2021 Silverado 2500 TCM is a job most DIYers with basic tools can handle. On most compatible trucks, the module is located on the left-hand (driver’s side) core support, near the radiator.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the TCM: Find the module on the driver’s side of the radiator core support. It’s a silver box with several large electrical connectors.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out. Do not force them.
- Remove Mounting Bolts: Use a socket wrench to remove the bolts securing the old TCM to its bracket.
- Install the New Module: Mount the new, pre-programmed TCM in place and tighten the bolts securely.
- Reconnect and Secure: Plug the electrical connectors back into the new module until they click, ensuring a solid connection. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and check for any warning lights. Take a short test drive to confirm that shifting is smooth and correct. No further programming is required!
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. It is compatible with part numbers 24042698, 24043411, 24043413, 24289415, and 24296206. Please verify your vehicle is on the list below. If you have any questions, provide your VIN and we can confirm fitment for you.
- CAMARO 2022-2023 (Underhood, LH frame rail)
- SIERRA 1500 PICKUP 2019 (New Style, LH core support)
- SIERRA 1500 PICKUP 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, LH core support)
- SILVERADO 1500 PICKUP 2020 (LH core support)
- SILVERADO 2500 PICKUP 2020-2021 (LH core support)
- SILVERADO 3500 PICKUP 2020-2021 (LH core support)
Frequently Asked Questions
Does this TCM require any additional programming?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation with no need to visit a dealer or mechanic for programming.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we receive and process your VIN.
Is this a genuine GM part?
Yes, this is a genuine GM part (service part number 24296206, primary part number 24289415) loaded with official GM software. It ensures perfect compatibility and function.
Where is the TCM located on my 2020 Silverado 2500?
On the 2020-2021 Silverado 2500/3500 and most Sierra HD models, the Transmission Control Module is mounted to the left-hand (driver’s side) radiator core support in the engine bay.
What if I order the wrong part?
By providing your VIN, we guarantee fitment. We will verify that this part is correct for your truck before programming and shipping, which prevents you from getting the wrong part.