Programmed 2020-2022 Sierra Denali 3500 TCM 24289415

Restore Your Truck’s Performance with a VIN-Programmed TCM

If you’re dealing with erratic shifting, a check engine light, or your 2020-2022 Sierra Denali 3500 going into limp mode, a failing Transmission Control Module (TCM) is often the culprit. I’ve spent over two decades in the garage, and with today’s complex 10-speed transmissions, a healthy TCM is non-negotiable for proper performance. A faulty module can cause frustrating and potentially damaging drivability issues, turning your powerful workhorse into a source of constant worry.

This isn’t just a replacement part; it’s a complete solution. We are providing a genuine GM TCM, part number 24289415, that comes fully programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication between the engine, transmission, and other vehicle systems. By flashing the module with the latest GM software updates before it even leaves our facility, we eliminate the need for an expensive trip to the dealership for programming. You get a part that is truly ready to install right out of the box, saving you significant time and money.

Is Your Truck Showing These Symptoms?

• ✔ Harsh, delayed, or erratic gear shifts.
• ✔ Transmission getting stuck in one gear (limp mode).
• ✔ Check Engine Light or Transmission Malfunction warning on the dash.
• ✔ Inaccurate gear indicator display.
• ✔ Stored Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0101.
• ✔ A noticeable decrease in fuel economy due to inefficient shifting.

A Straightforward Guide to Installation

1. ✔ Safety First: Disconnect the negative terminal from your truck’s battery and wait a few minutes for the systems to discharge.
2. ✔ Locate the TCM: On most 2019+ GM HD trucks, the TCM is mounted to the LH (driver’s side) core support, near the radiator.
3. ✔ Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old module. These connectors have locking tabs, so be gentle to avoid damage.
4. ✔ Remove the Old Module: Unbolt the old TCM from its mounting bracket. Keep the hardware as you will reuse it.
5. ✔ Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the original hardware.
6. ✔ Reconnect Everything: Firmly plug the electrical connectors into the new module until they click. Reconnect the negative battery terminal.
7. ✔ Final Check: Start the vehicle. The new module is already programmed, so no further action is needed. Check for any warning lights and take a test drive to confirm smooth shifting.

Verified Vehicle Compatibility

This module, part number 24289415, is a direct replacement for service numbers 24042698, 24043411, 24043413, and 24296206. It is guaranteed to fit the following vehicles:

Frequently Asked Questions