Restore Your Truck’s Shifting Performance
Is your Sierra or Silverado experiencing erratic shifting, getting stuck in gear, or throwing a check engine light? Before you suspect a major transmission problem, the issue could be its electronic brain: the Transmission Control Module (TCM). In my 20+ years as a technician, I’ve seen countless modern trucks sidelined by a faulty TCM. These modules manage every aspect of your transmission’s operation, and when they fail, the symptoms can be alarming. This genuine GM TCM, part number 24289415, is the definitive solution to get your truck back to operating smoothly and reliably.
We take the guesswork and dealership hassle out of the equation. Unlike a generic part off the shelf, we flash this module with the latest official GM software specifically for your vehicle. Simply provide us with your VIN during checkout, and we handle the programming before it even ships. This ensures that when it arrives, it’s ready for installation, saving you hundreds in dealer programming fees and diagnostic time. This is a crucial step for a successful repair on these advanced trucks.
From the Diagnostic Bay: The Case of the Confused Sierra
A few months back, a 2021 Sierra 2500 was towed into my shop. The owner was frustrated; the truck would randomly refuse to shift past 3rd gear and the tow/haul mode light was flashing. He was worried he needed a full transmission rebuild. After connecting my scan tool, I pulled a U0100 (Lost Communication with ECM) and a P0700 (Transmission Control System Malfunction). While these codes can seem generic, my experience pointed towards an electronic issue, not a mechanical one. We inspected the wiring harness for damage—it was pristine. The culprit was an internally failing TCM that was intermittently losing power. We installed a new, pre-programmed module, performed the transmission service relearn procedure, and the truck was shifting perfectly within an hour. It saved the customer thousands and a lot of unnecessary stress.
Diagnosing a Faulty Transmission Control Module
A failing TCM can present a variety of symptoms that often get misdiagnosed. If your truck is showing these signs, your module is the likely culprit. This is especially true if the issues are intermittent or worsen as the vehicle warms up. A proper diagnosis with a quality scan tool is always recommended, but these are the classic indicators I see in the shop every week. By choosing a pre-programmed 2020-2022 Sierra 3500 TCM, you are addressing the core electronic cause of these problems.
Is Your Truck Showing These Symptoms?
- ✔ Check Engine Light is illuminated on the dash.
- ✔ Transmission is stuck in one gear (limp mode).
- ✔ Harsh, delayed, or erratic shifting between gears.
- ✔ Unexplained warning messages on the instrument cluster.
- ✔ Poor fuel economy due to inefficient shifting.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, U0100, P0606.
- ✔ Inability to engage tow/haul mode or other transmission features.
A Straightforward Guide to Installation
Installing your new TCM is a manageable job for a DIYer with basic tools. Because we program the module to your VIN, you won’t need any special electronic tools for the installation. Just follow these steps carefully.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the TCM: On most Sierra and Silverado models, the TCM is mounted on the left-hand (driver’s side) core support, near the front of the engine bay.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them.
- Remove the Module: Unbolt the old TCM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket using the original hardware. Ensure it is secure.
- Reconnect Everything: Plug the electrical connectors firmly back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: While the module is plug-and-play, some vehicles may require a transmission service relearn procedure with a capable scan tool to ensure optimal shift quality from the start.
Verified Vehicle Compatibility
This module, part number 24289415, is a direct replacement for multiple service numbers, ensuring broad compatibility. Please verify your vehicle is on this list for guaranteed fitment. The location is noted for your convenience.
SIERRA 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SIERRA 1500 PICKUP 20 Transmission Control; (LH core support)
SIERRA 2500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA 3500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA DENALI 1500 19-20 Transmission Control; (LH core support)
SIERRA DENALI 2500 20-22 Transmission Control; (LH core support)
SIERRA DENALI 3500 20-22 Transmission Control; (LH core support)
SILVERADO 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SILVERADO 1500 PICKUP 20 Transmission Control; (LH core support)
SILVERADO 2500 PICKUP 20-21 Transmission Control; (LH core support)
SILVERADO 3500 PICKUP 20-21 Transmission Control; (LH core support)
Compatible Service Numbers: 24042698, 24043411, 24043413, 24289415, 24296206
Frequently Asked Questions
Frequently Asked Questions
Do I need to program this TCM?
No! This is the biggest benefit we offer. We program the module to your vehicle’s specific VIN before shipping it. It arrives ready to be installed, saving you a trip to the dealership.
What do you need from me after I purchase?
After you place your order, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship the module without it.
Where can I find my VIN?
Your VIN can be found on your vehicle’s registration, insurance card, or on a placard on the driver’s side dashboard visible through the windshield.
Is this a new or used part?
This is a genuine, new OEM-quality replacement part that has been professionally programmed with the latest software for your vehicle.
Will this fix my hard shifting problem?
If the hard shifting is caused by a faulty module, then yes, this part is the correct solution. It directly resolves issues like incorrect shift commands and communication errors that lead to poor shift quality.
What if my part number isn’t 24289415?
This module also replaces service numbers 24042698, 24043411, 24043413, and 24296206. If your original module has one of these numbers, this part is the correct replacement.